VEXAG Meeting Agenda

November 8–9, 2021

Virtual Meeting

Times listed are U.S. Pacific Standard Time (PST) and Eastern Standard Time (EST).

U. S. Standard time begins on November 7 at 2:00 a.m. Clocks will be set back one (1) hour.

Monday, November 8

PST	EST	Presenters	Topic
10:00 a.m.	1:00 p.m.	Darby Dyar	The Year for VEXAG Presentation
10:40 a.m.	1:40 p.m.	Lori Glaze	NASA HQ Presentation Presentation
11:20 a.m.	2:20 p.m.	Michael Lienhard, Carolyn Mercer	HOTTECH/PESTO Presentation
11:35 a.m.	2:35 p.m.	Shannon Curry	Parker Solar Probe
11:45 a.m.	2:45 p.m.	Martin Volwerk	Solar Orbiter
11:55 a.m.	2:55 p.m.	Olivier Witasse	JUICE
12:05 p.m.	3:05 p.m.	Joern Helbert	BepiColombo
12:15 p.m.	3:15 p.m.	Darby Dyar	Lightning Talks for Poster Session (1 minute each)
		Venus Atmospheres -Dirk Schulze-Makuch [#8005] -Brandon Ponder [#8007] -Paula Duque Baron [#8010] -Blair McGinness [#8017] -Michael Radke [#8018] -Alex Akins [#8019] -Srirag Nambiar [#8020] -Jim Head [#8023] -Christopher Fowler [#8027] -Hilary Justh [#8029] -Grzegorz Slowik [#8030] -Kathy Mandt [#8043] -Antoine Martinez [#8045] -Noam Izenberg [#8057] -Diana Gentry [#8061] -Pablo Sobron [#8063] -Milan Kroupa [#8065] -Mark Bullock [#8067] -Ryan McCabe [#8070]	Venus Potpourri -Shaosui Xu [#8009] -Robin Ramstad [#8058] -Richard Hart [#8069] -Alessandro Maturilli [#8022] -Alison Santos [#8044] -Michael Way [#8004] -Alexandra Warren [#8008] -Jean-Luc Margot [#8025] -Janusz Petkowski [#8031] -Sonam Jitarwal [#8042] -Colby Ostberg [#8053] -Stephen Kane [#8064]
1:15 p.m.	4:15 p.m.	Poster session in Gather.town. Posters listed below.
2:15 p.m.	5:15 p.m.		Adjourn

Tuesday, November 9

PST	EST	Presenters	Topic
6:30 a.m.	9:30 a.m.	Takehiko Satoh	Akatsuki
6:40 a.m.	9:40 a.m.	Darby Dyar	Lightning Talks for Poster Session (1 minute each)
		Venus Missions and Technology -Santiago Martínez [#8013] -Sebastien Lebonnois [#8021] -John Vistica [#8039] -Benjamin Cameron [#8047] -James Cutts [#8051] -Liudmila Zasova [#8055] -Jeffrey Balcerski [#8056] -Thomas Widemann [#8068] -Siddharth Krishnamoorthy [#8012] -Aaron Brandis [#8015] -Jacob Izraelevitz [#8034] -Margaret Stackpoole [#8037] -Jeffrey Balcerski [#8054] -Isabel King [#8060] -Erika Kohler [#8062] -Tibor Kremic [#8006]	Venus Surface Geology and Interior -Madison Borrelli [#8014] -Garrett Wolff [#8024] -Debra Buczkowski [#8026] -David Blake [#8032] -Richard Ernst [#8035] -Indujaa Ganesh [#8038] -Iván López [#8041] -Andriana Strezoski [#8048] -Bruce Campbell [#8049] -Paul Byrne [#8059] -Tracy Gregg [#8066] -Satvika Jaiswal [#8011] -Diogo Lourenço [#8016] -Grant Euen [#8028] -Andrea Adams [#8033] -Julia Maia [#8040] -Scott King [#8050] -Madeleine Kerr [#8052]
7:30 a.m.	10:30 a.m.	Poster session in Gather.town. Posters listed below.
8:30 a.m.	11:30 a.m.	Sue Smrekar	VERITAS
8:45 a.m.	11:45 a.m.	Jim Garvin	DAVINCI
9:00 a.m.	12:00 p.m.	Ludmila Zasova	Venera-D
9:15 a.m.	12:15 p.m.	Richard Ghail	EnVision
9:30 a.m.	12:30 p.m.	Noam Izenberg	How Missions Affect VEXAG Strategic Plan; Prospects for New Frontiers Proposals Presentation
9:45 a.m.	12:45 p.m.	Tibor Kremic	Final Report, Venus Surface Platform Report
9:55 a.m.	12:55 p.m.	Valerie Scott	KISS In-Situ Sample Analysis Aerial Laboratory Workshop
10:05 a.m.	1:05 p.m.	Tilman Spohn	ISSI Venus Workshop
10:15 a.m.	1:15 p.m.	Darby Dyar, Noam Izenberg	Certificates of Appreciation, Discussion of VEXAG Findings, VEXAG Business: IDEA Policy, Legislative Initiatives
11:30 a.m.	2:30 p.m.		Adjourn

Monday Posters

Poster Locater	Authors	Abstract Title and Summary
Venus Atmospheres
A-1	Schulze-Makuch D.*	The Controversy About Possible Life in the Venusian Cloud Deck: What are the Next Steps to Gain Further Insights? [#8005] Theoretical and laboratory experiments are suggested to find out what the limits of life are in regard to lack of water, acidity (H2SO4), and lack of trace metals and whether these obstacles could possibly be overcome in the Venusian clouds.
A-2	Ponder B. M.* Bougher S. W. Ridley A. J. Pawlowski D. J.	Venus Global Ionosphere Thermosphere Model [#8007] The Venus Global Ionosphere Thermosphere Model (V-GITM) is a first principles based model attempting to recreate observations of the ion and neutral densities, winds, and temperatures in the thermosphere and ionosphere.
A-3	Duque Baron P. D.* Casadiego Molina J. F. Londoño Villamil G. Aldana Hernández M. Concha Salazar D.	Fakos — Atents, Eyes in the Clouds of Venus [#8010] This concept is based on the design, manufacture, and implementation of a group of independent miniaturized sensor systems, with a maximum volume of one liter and a weight of around 1kg, for the detection of phosphine present in the environment.
A-4	McGinness B*. Nicoll K. A. Airey M. W. Harrison R. G.	Charged Haze Layers in Venus’ Lower Atmosphere [#8017] Measurements recorded by the Venera 13 and 14 landers pointed towards the existence of charged haze layers in the lower atmosphere. The plausibility of these haze layers was investigated using an electrical model of the atmosphere.
A-5	Radke M. J.* Horst S. M. Serigano J. IV He C. Gautier T. Trainer M. G.	Reanalysis of the Pioneer Venus Large Probe Neutral Mass Spectrometer Data [#8018] We reanalyzed the Pioneer Venus Large Probe Neutral Mass Spectrometer (LNMS) using techniques designed for the Cassini INMS at Saturn in order to produce mixing ratio profiles of major and minor species from ~64 km to the surface of Venus.
A-6	Akins A. B.* Bocanegra-Bahamón T. M. Vergados P. Ao C. O. Asmar S. W. Preston R. A.	Ground and Space-Based Microwave Remote Sensing of the Venus Atmosphere in Support of the Decade of Venus [#8019] We discuss how upcoming radio occultation measurements with VERITAS/EnVision and recent VLA observations can be used to sense the thermal structure and abundance of sulfur species in the Venus atmosphere below 60 km.
A-7	Nambiar S.* Pabari J. P.	Meteoric Ablation in Venus Atmosphere: Mass, Speed, and Temperature Variation [#8020] Our solar system is filled with dust particles stemming from a variety of sources. These particles get ablated on entering the planetary atmosphere which affects the atmospheric chemistry. Here, we study such ablation in the Venusian atmosphere.
A-8	Head J. W.* Wilson L. Ivanov M. A. Wordsworth R.	Contributions of Volatiles to the Venus Atmosphere from the Observed Extrusive Volcanic Record: Implications for the History of the Venus Atmosphere [#8023] The current Venus atmosphere may be a “fossil atmosphere,” largely inherited from a previous epoch in Venus history, and if so, may provide significant insight into the conditions during the first 80% of Venus’ history.
A-9	Fowler C. M.* Frahm R. A. Xu S. Chaffin M.	Atmospheric Evolution and Past Habitability of Venus: Understanding the Roles of Ion Escape Processes [#8027] Understanding the evolution of Venus requires knowledge of the absolute and relative loss rates of planetary atmosphere to space. This presentation focuses on the loss of ions to space and the processes that drive it.
A-10	Justh H. L.* Dwyer Cianciolo A. M. Aguirre J. T. Diekmann A. Hoffman J. Powell R. W.	Venus Global Reference Atmospheric Model (Venus-GRAM) Upgrades [#8029] The Venus Global Reference Atmospheric Model (Venus-GRAM) is one of the most widely used engineering models of Venus’ atmosphere. This presentation provides a summary of Venus-GRAM upgrades, release status, and future upgrade plans.
A-11	Slowik G. P.* Limaye S. S. Stryjska A. Z. Przysiecka L. Dabrowski P.	Acidithiobacillus Ferrooxidans Bacteria Strain DSM 583 as Possible Analogues of Microorganisms Potentially Living in the Lower Cloud Layer of Venus [#8030] On the basis of the conducted research, it was found that the nature of the UV-Vis-NIR spectra of Acidithiobacillus ferrooxidans bacteria, strain DSM 583, is similar to that obtained for Venus in the range approximately of 0.2–1.3 μm.
A-12	Mandt K. E.* Luspay-Kuti A. Mousis O.	Relevance of Rosetta Noble Gas and Isotopic Measurements to Understanding the Origin and Evolution of Venus’ Atmosphere [#8043] Recent noble gas abundances and isotope ratios for the comet 67P/Churyumov-Gerasimenko provide new information relevant to using future measurements of noble gases in the atmosphere of Venus to understand its origin and evolution.
A-13	Martinez A.* Brecht A. S. Karyu H. Lebonnois S. Bougher S. W. Kuroda T. Kasaba Y. Gilli G. Navarro T. Sagawa H.	Venusian Upper Mesosphere and Lower Thermosphere GCMs Intercomparison Project [#8045] We will present a comparison study of three Venusian GCMs focusing on the upper mesosphere and lower thermosphere. Observational data from several missions such as Magellan, Pioneer Venus, and Venus Express will be used to validate the predictions.
A-14	Izenberg N. R.* Horst S. M. Kraemer D. R. B. Papadakis S. J. Garvin J. B. Getty S. Arney G. N. Johnson N. Kohler E.	VfOx: Venus Oxygen Fugacity, DAVINCI’s Student Collaboration Experiment [#8057] Down deep we sniff out / Venus’ O2 pressure / Seeking stabilities.
A-15	Gentry D. M.* Iraci L. Cassell A. Mattioda A. Brecht A. Simon K. Sobron P. Davila A.	Cloud Habitability from Earth to Venus: Science and Technology Considerations [#8061] Earth’s atmosphere contains a substantial microbial presence, but it is mostly inactive and highly heterogeneous. Venus missions addressing cloud habitability should consider this variability when assessing needed coverage and limits of detection.
A-16	Simon K. Eshelman E. Sobron P.* Brecht A. Cassell A. Davila A. Gentry D. Iraci L. Mattioda A.	Real Time Cloud Composition Profiles with an Optofluidic Instrument [#8063] Compact spectroscopic instrument to characterize the chemical composition of Venus’ cloud deck, including ppb-level detection of organic functional groups, in real time during dive-in missions.
A-17	Kroupa M. K.*	Long Endurance PV Powered Venus Glider [#8065] We propose a large wingspan, ultra-light, photovoltaically powered glider which is capable of shedding the incoming velocity in a low angle descent over a long flight path which will allow circumnavigation and observation over an extended time period.
A-18	Bullock M. A.* Elston J. S. Stachura M. Z. Lebonnois S.	Sustained In Situ Exploration of Venus’ Cloud Discontinuity [#8067] We discuss how an aircraft can harvest energy in Venus’ atmosphere for sustained flight and perform in situ scientific experiments around the planet.
A-19	McCabe R. M.* Sayanagi K. M. Blalock J. J. Gunnarson J. Garland J. McNabb J. M. C. Peralta J. Gray C. McGouldrick K. Imamura T. Watanabe S. Lee Y. J.	Analysis of Observational Sampling and Geometry Effects on Dayside Measured Winds During Venus Express [#8070] We investigate the effects observational and illumination geometries have on the measured ~20 m/s increase in Venus’s cloud-top superrotation over the course of the Venus Express mission (2006-2013). We cloud-track UV images to measure such winds.

Poster Locator	Authors	Abstract Title and Summary
Venus Potpourri
B-1	Xu S.* Frahm R. A. Ma Y. J. Luhmann J. G. Mitchell D. L.	Magnetic Topology at Venus: New Insights into the Venus Plasma Environment [#8009] We utilize measurements from Venus Express to determine magnetic connectivity to the ionosphere and/or solar wind for the first time. This connectivity is important for understanding ion escape and thus Venus’ atmospheric loss.
B-2	Ramstad R.* Johnson J.	Electric Current Systems Induced by Solar Wind Coupling with Venus [#8058] We analyze Venus Express magnetometer measurements, applying a method previously developed for Mars to derive solar wind-induced electric current densities. The results partially reveal the morphology and strengths of the current systems at Venus.
B-3	Hart R. A.* Russell C. T. Zhang T. L.	Lightning on Venus Confirmed by Frequent Observations of Whistler-Mode Waves [#8069] Lightning on Venus has been a topic of contention since the before the Pioneer Venus and Venera age. Venus Express regularly observed lightning-generated whistler-mode wave at low altitudes in the Venus ionosphere.
B-4	Maturilli A.* Alemanno G. Helbert J. Dyar D.	The VNIR Emissivity Spectra of Venus Analogue Rocks for the Interpretation of “The Decade of Venus” Remote Sensing Data [#8022] VNIR emissivity spectra (measured in vacuum, for Tsample >400°C) of Venus analog rocks taken at PSL and down-sampled to VEM filters (VEM flying on NASA VERITAS and ESA EnVision) allow to distinguish between basaltic and felsic rock types.
B-5	Santos A. R.* Gilmore M. S.	Experimental Investigation of Mineral Reaction Rates in Venus-Relevant Gases [#8044] An experimental setup for examining simplified mineral-gas reactions relevant to Venus has been created at Wesleyan University. Initial results from experiments using calcite are discussed.
B-6	Way M. J.* Ernst R. E. Scargle J. D.	Can Large Scale Volcanism Explain the Heat-Death of Venus? [#8004] We investigate the hypothesis that overlapping Large Igneous Provinces could have driven Venus from a temperate to a runaway greenhouse state. We look at the LIP record in Earth history and the probability for overlapping LIP events as a proxy.
B-7	Warren A. O.* Kite E. S.	Constraints on Early Venus Habitability from Atmospheric O2 [#8008] Could Venus ever have been habitable? We use measurements of O2 in Venus’ present-day atmosphere and a new mass-balance model to explore Venus’ atmospheric evolution over time and identify possible early habitable scenarios.
B-8	Margot J. L.* Campbell D. B. Giorgini J. D. Jao J. S. Snedeker L. G. Ghigo F. D. Bonsall A.	Radar Measurements of the Spin State, Moment of Inertia, and Length-of-Day Variations of Venus [#8025] We analyzed 21 radar speckle tracking observations of Venus’s instantaneous spin state spanning almost 15 years to characterize its interior structure, length of day, and the remarkable influence of the atmosphere on the length of day.
B-9	Petkowski J. J.* Bains W. Rimmer P. B. Seager S.	Towards an Explanation for Venusian Cloud Anomalies and Implications for the Habitability of the Clouds [#8031] We present a transformative hypothesis for the chemistry of the atmospheric cloud layers of Venus while reconciling decades-long atmosphere anomalies.
B-10	Jitarwal S.* Pabari J. P. Dinesh Kumar V. R. Nambiar S. Rashmi S. Upadhyaya T. Acharyya K. Sheel V.	Sensitivity Analysis and Testing of Electrically Short Dipole Antenna for Lightning Instrument for Venus (LIVE) [#8042] To understand the lightning phenomenon on Venus, a Lightning Instrument for Venus (LIVE) is proposed for future Venus mission orbiter. This paper presents the sensitivity analysis of LIVE with respect to an earlier mission (PVO).
B-11	Ostberg C. M.* Kane S. R. Dalba P. A.	Surprising Similarities: Comparing the Transit Spectra of Potential Earth-Like and Venus-Like Exoplanets [#8053] The transmission spectra of Venus is severely affected by its global cloud and haze layers, which truncates the majority Venus’ CO2 absorption features. This will cause difficulties when identifying potential Venus like worlds.
B-12	Kane S. R.* Arney G. Head J. W. Kopparapu R. Lyons T. Ostberg C. Schwieterman E. Unterborn C. Way M. J.	Venus as an Exoplanet Laboratory: Testing the Boundaries of Habitability [#8064] We describe a pathway toward a revised habitability timeline for Venus compared with Earth, with application to climate studies of exoplanets and in-situ measurements from Venus missions.

Tuesday Posters

Poster Locater	Authors	Abstract Title and Summary
Venus Missions and Technology
C-1	Rincon Martínez S.* Acevedo Mena J.  D. Alvarado A. F.	Engineering Concept for the Initial Stage Mission of an Astrobiological Exploration Mission Using a 6U CubeSat [#8013] First, all objectives will be academic in design of CubeSat technology. Moving forward in this topic, we will enter a field with scientific objectives candidate for a launch in the long-term.
C-2	Lebonnois S.* Millour E. Martinez A. Pierron T. Forget F. Spiga A. Chaufray J.-Y. Montmessin F. Cipriani F.	The Venus Climate Database [#8021] The Venus Climate Database (VCD) is a tool intended to be useful for engineers and scientists wanting to compare with their models, analyze observations or plan future missions. This project is funded by the ESA in the frame of the EnVision mission.
C-3	Vistica J. T.*	Leviathan: A Starship-Based Venus Aerobot for Low-Altitude and Surface Explorations [#8039] The Leviathan-class Venus Aerobot is a 31-ton nuclear-powered stainless-steel helium-filled semi-autonomous balloon with a cruising altitude of 8 km capable of landing and taking off almost anywhere with a payload and systems capacity of 15 tons.
C-4	Cameron B. H.* Kattamis N. T. Kaszeta R. W.	A Compact Drone-Based Instrument Sonde for Venus Balloon Missions [#8047] Creare is developing an instrumented drone to support Venus balloon missions. The drone extends the effective operating altitude of the balloon by flying above and below the platform and performing a range of possible missions.
C-5	Cutts J. A.* Lee C. H. Lazio J. Arora A. Dorsky L. I. Baines K. H. Saikia S. J. Cheung K. M. Asmar S. W. Frazier W. E. Wallace M. S.	Potential Orbital Relay Capabilities for Surface and Aerial Platforms at Venus [#8051] In this study, we explore the benefits to future Venus in situ missions with entry probes, aerial platforms, and landers of relay communications from the VERITAS, EnVision, and DAVINCI spacecraft.
C-6	Zasova L. V.* Zeleny L. M. Korablev O. I. Sedykh O. Yu. Venera-D Science Definition Team	VENERA-D Mission for Comprehensive Study of Venus [#8055] The main science goals of Venera-D mission are formulated. The in situ measurements in the atmosphere, in the clouds, and on the surface are planned. Last time such in situ measurements were done 35 years ago by Vega balloons and landers.
C-7	Balcerski J. A.* Jessup K. L. Hunter G. W. Kremic T. Colozza A. J. Zborowski M. G.	LEAVES — A Platform for Widely Distributed Exploration of Venus’ Atmosphere [#8056] LEAVES is a swarm sensor platform for exploring Venus’ atmosphere above, within, and below the clouds. Resulting data, broadly distributed over spatial and temporal scales, will allow for a more comprehensive understanding of the dynamic atmosphere.
C-8	Widemann T.* Ghail R. Wilson C. Titov D.	EnVision at Venus: Europe’s Next Medium-Class Science Mission [#8068] EnVision will deliver new insights into Venus’ geological history through global/targeted surface imaging, polarimetry, radiometry and spectroscopy, subsurface sounding, gravity mapping, tropospheric and mesospheric study of key volatile species.
C-9	Krishnamoorthy S.* Martire L. Bowman D. C. Jacob J. Elbing B. Hough E. Yap Z. Lammes M. Linzy H. Swaim T. Vance A. Simmons P. M. Komjathy A. Pauken M. T. Cutts J. A. Brissaud Q. Jackson J. M. Garcia R. F. Mimoun D.	Progress Towards Balloon-Based Seismology on Venus in 2020–2021 [#8012] The surface of Venus is too hot for seismometers; we talk about seismology from a balloon to avoid the surface.
C-10	Brandis A.* Barnhardt M. Hughes M. West T. Wright M.	Impact of NASA’S Entry Systems Modeling Project on Planetary Mission Design:  VEXAG [#8015] Overview Entry, Descent, and Landing (EDL) technology model development under NASA’s Entry Systems Modeling (ESM) Project, with particular relevance to development relevant to Venus entry.
C-11	Izraelevitz J. S.* Pauken M. Krishnamoorthy S. Goel A. Aiazzi C. Dorsky L. Baines K. Cutts J. Turner C. Carlson K. Lachenmeier T. Hall J. L.	Hangar Flight Testing of a Subscale Venus Variable-Altitude Aerobot [#8034] This presentation describes our 1/3-scale variable-altitude aerobot prototype, made of metallized Teflon, which targets 52–62 km altitudes in the Venus cloudlayer. The prototype recently passed its first indoor flight test in the Tillamook hangar.
C-12	Venkatapathy E. Gasch M. Stackpoole M.* Suman M. Morgan J.	Robust and Mass Efficient Thermal Protection Systems for Future Venus Missions [#8037] While recent maturation of “Heatshield for Extreme Entry Environment Technology (HEEET)” to TRL 6 has closed a significant gap, advocacy is needed to sustain as well as improve the mass efficiency to enable demanding future Venus missions.
	Cogan B. R.* Canceled Poster Presentation	Venus Exploration Technologies and Opportunities Through the NASA Small Business Innovative Research (SBIR) and Small Business Technology Transfer Research (STTR) Program [#8046] The NASA SBIR/STTR Program has funded over 50 contracts with small businesses to support future Venus missions. Balloons, UAVs, landers, sensors, batteries, cooling systems, and other technologies have been developed to enable future Venus missions.
C-13	Balcerski J. A.* Port S. T. Kremic T. Hunter G. W. Nakley L. M. Phillips K. G.	Comprehensive Venus Surface Environment Simulation with the Glenn Extreme Environment Rig [#8054] With its combination of large volume, precisely controlled gas mixes, in-line analytic monitoring, and ability to simulate surface conditions continuously for months, GEER is the most comprehensive Venus simulation facility currently in operation.
C-14	King I. R.* Bywaters K. F. Zacny K. Seager S. Petkowski J.	Tape and Roller Sampling System for Flexible Venusian Atmosphere Aerosol Capture and Delivery [#8060] An all-in-one collection, delivery, and sealing system for studying aerosols in the Venusian atmosphere. The system’s small and flexible packaging size make it adaptable to many mission architectures and instrument types.
C-15	Kohler E.* Johnson N. M.	Hot Environments Lab: A New Lab for Venus Experimental Investigations [#8062] NASA Goddard Space Flight Center has developed a new analytical laboratory designed to support Venus missions through scientific and technology investigations. A flexible laboratory, it can be used to simulate various hot environments.
C-16	Kremic T.* Hunter G. W. Tolbert C. M.	Development Status of NASA’s Long-Lived In-Site Solar System Explorer (LLISSE) [#8006] This presentation will discuss the development status of LLISSE as far as achieving desired science measurements and surface life-time objectives.

Poster Locater	Authors	Abstract Title and Summary
Venus Surface Geology and Interior
D-1	Borrelli M. E.* O’Rourke J. G. Williams D. A.	Investigating the Formation of Lava Channels on Venus with New Models and New Topography [#8014] We are assembling a database of lava channels on Venus with new stereo-derived topography. We will model canali formation by erosion from flowing lava to explore all the parameters that govern channel formation and to test possible lava compositions.
D-2	Wolff G. M.* Treiman A. H. Dalton H. Milazzo S.	A Newly Recognized Type of Magellan SAR Artefacts [#8024] We identify a type of artefact present throughout Magellan SAR imagery that appears consistent with fine-grained aeolian deposits, and show that these features are recognizable by the same characteristics that confirm their false nature.
D-3	Buczkowski D. L.* Fattaruso L. A. McGowan E. M. McGill G. E.	Volcanoes of the Lachesis Tessera Quadrangle (V-18), Venus [#8026] We present an evaluation of the four large central volcanoes, abundant small shield volcanoes, and assorted other volcanic materials identified in the V-18 Lachesis Tessera quadrangle, as revealed by geologic mapping.
D-4	Blake D. F.* Sarrazin P. Bristow T. F. Treiman A. H. Zacny K. Morrison S.	Progress in the Development of CheMin-V, a Definitive Mineralogy Instrument for Landed Science on Venus [#8032] CheMin-V can identify and quantify all minerals in Venus regolith. CheMin-V will receive and analyze samples delivered to it by the HBR PlanetVac system. The instrument and sample handling system will be TRL-6+ by early 2022.
D-5	Ernst R. E.* Buchan K. L. El Bilali H. Head J. W.	Assessing a Large Igneous Province (LIP) Context for Volcanism and Tectonics on Venus [#8035] Voluminous Venusian magmatism may be analogous to Large Igneous Provinces (LIPs) on Earth. We consider implications of the terrestrial LIP paradigm for the Venus geological record.
D-6	Ganesh I.* Carter L. M. Henz T. N.	Radar Backscatter Models of Possible Pyroclastic Deposits on Venus [#8038] We model radar backscattering from synthetic pyroclastic flow deposit models to relate the radar properties of possible pyroclastic flow units on Venus with their physical properties.
D-7	López I.* Martín L. Jiménez-Díaz A. D’Incecco P. Komatsu G. Filiberto J.	Preliminary Geologic Mapping of Imdr Regio, Venus [#8041] We present the preliminary geologic mapping of the Imdr Regio large igneous rise. This preliminary mapping suggests that there are different styles of volcanism in Imdr Regio that are contemporaneous with the formation of Olapa Chasma.
D-8	Strezoski A.* Treiman A. H.	Snowline Elevations and Discordance of Elevation and Reflectance on Venus’s Maxwell Montes [#8048] The edge of Maxwell Montes’ snowline varies in elevation (~4.2 km SE, ~8 km NE). We also observe the expected inverse relationship of radar properties, as well as an anomalous decrease in reflectivity at the highest elevations of Maxwell.
D-9	Campbell B. A.* Whitten J. L.	Crater Ejecta and the Search for Felsic Material in Maxwell Montes, Venus [#8049] Maxwell Montes on Venus may preserve evidence of a past water-rich environment. We combine Magellan and Arecibo radar data to characterize surface properties across Maxwell for orbital or landed investigations.
D-10	Byrne P. K.* Ghail R. C. James P. B. Şengör A. M. C. Solomon S. C.	Some Tessera on Venus May be Geologically Young [#8059] Geologically young deformation along tessera margins suggests that a major reassessment of Venus’ geological history and level of current activity is needed.
D-11	Gregg T. K. P.*	Venusian Plains: Similarities with Mid-Ocean Ridge Basalts [#8066] Venusian canali and the plains in which they are found are most likely formed by basaltic lavas. The unique temperature pressure conditions at the planet’s surface result in lava morphologies similar to those observed at Earth’s mid-ocean ridges.
D-12	Jaiswal S.* Mahajan R. R. Ngangom M.	What is the Noble Gas Composition and Inventory in Venus Interior? [#8011] Study of noble gases.
D-13	Lourenço D. L.* Rozel A. B. Ballmer M. D. Tackley P. J.	Plutonic-Squishy Lid: A New Global Tectonic Regime Generated by Intrusive Magmatism on Earth-Like Planets [#8016] For high rates of intrusive magmatism, the “plutonic-squishy-lid” tectonic regime exists on rocky planets. It is characterized by drippings/delaminations of the crust, significant surface velocities (without subduction), and small, short-lived plates.
D-14	Euen G. T.* King S. D.	Venusian Impact: Starting a Mobile Lid [#8028] Venus is hypothesized to be in a stagnant-lid regime, yet shows evidence of resurfacing in the past 500 million years. ASPECT is used to model planetary impacts as a potential trigger for mobile-lid conditions.
D-15	Adams A. C.* Stegman D. R. Smrekar S. E.	Modeling Rollback Subduction Dynamics on Venus [#8033] Venus’ relatively uniform surface age may be explained by a series of regional-scale resurfacing events. We performed numerical experiments to determine the conditions for which the lithosphere of Venus may subduct.
D-16	Maia J. S.* Wieczorek M. A.	Lithospheric Structure of Venusian Crustal Plateaus [#8040] We perform a comprehensive study of the interior structure of crustal plateaus using localized spectral admittance techniques. These features are very close to an isostatic compensation regime and their average crustal thickness is about 25 km.
D-17	King S. D.* Euen G. T.	The Evolution of Surprisingly Stationary Plumes Within Venus [#8050] As an internally-heated stagnant-lid planet such as Venus cools, the convective pattern evolves from a plume-dominated to a degree-2-dominated pattern. This evolution provides markers that may be reflected in the tectonic history of Venus.
D-18	Kerr M. C.* Stegman D. R.	Modeling Subducted Lithosphere Fragments Interacting with Mantle Plumes on Venus [#8052] Exploring with numerical models how a descending fragment of the brittle Venusian lithosphere might interact with mantle convection if there was a modest temperature gradient across the core-mantle boundary (CMB) of Venus producing mantle plumes.

Print Only

Author	Abstract Title and Summary
Limaye S. S.	Astrobiology Venus Collection [#8036] This is a summary of the Special Collection on Venus issue of Astrobiology, October 2021.