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Journal of Geophysical Research: Planets (1991–2012)

Cover image for Journal of Geophysical Research: Planets (1991–2012)

October 2012

Volume 117, Issue E10

Currently known as: Journal of Geophysical Research: Planets

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      Magnetic field direction and lunar swirl morphology: Insights from Airy and Reiner Gamma

      Doug Hemingway and Ian Garrick-Bethell

      Article first published online: 30 OCT 2012 | DOI: 10.1029/2012JE004165

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      Key Points

      • Magnetic field direction influences lunar swirl morphology
      • Lunar swirls are primarily formed due to magnetic deflection of solar wind
      • Lunar swirl morphology can be used to infer magnetic fields at the surface
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      Rates of temperature change of airless landscapes and implications for thermal stress weathering

      Jamie Molaro and Shane Byrne

      Article first published online: 25 OCT 2012 | DOI: 10.1029/2012JE004138

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      Key Points

      • Rates of temperature change effect thermal stress weathering efficacy
      • On airless bodies, these are controlled primarily by sunrise and set durations
      • High temporal and spatial temperature gradients are not necessarily correlated
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      Asymmetry of Io's outer atmosphere: Constraints from five Galileo flybys

      Vincent Dols, Peter A. Delamere, Fran Bagenal, William S. Kurth and William R. Paterson

      Article first published online: 20 OCT 2012 | DOI: 10.1029/2012JE004076

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      Key Points

      • The interaction of Io's atmosphere is modeled with MHD and chemistry codes
      • Comparison to Galileo data suggests Io's atmosphere is longitudinally asymmetric
      • Interaction generates substantial corona of SO2
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      Development of a fast, accurate radiative transfer model for the Martian atmosphere, past and present

      Michael A. Mischna, Christopher Lee and Mark Richardson

      Article first published online: 19 OCT 2012 | DOI: 10.1029/2012JE004110

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      Key Points

      • Correlated-k radiative transfer models are suited for the Martian atmosphere
      • A step-by-step approach is given, detailing how to develop such a model
      • First ever validation against other radiative transfer models for Mars is given
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      Reproducing early Martian atmospheric carbon dioxide partial pressure by modeling the formation of Mg-Fe-Ca carbonate identified in the Comanche rock outcrops on Mars

      Wolfgang van Berk, Yunjiao Fu and Jan-Michael Ilger

      Article first published online: 16 OCT 2012 | DOI: 10.1029/2012JE004173

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      Key Points

      • Hydrogeochmical models of aqueous alteration of Comanche rocks are presented
      • Models reproduce the exact composition of Comanche rocks' Mg-Fe-Ca carbonate
      • Reproduced Mg-Fe-Ca carbonate composition is indicative for ca. 1.0 bar pCO2
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      The history of Mars' dynamo as revealed by modeling magnetic anomalies near Tyrrhenus Mons and Syrtis Major

      C. Milbury, G. Schubert, C. A. Raymond, S. E. Smrekar and B. Langlais

      Article first published online: 13 OCT 2012 | DOI: 10.1029/2012JE004099

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      Key Points

      • We have developed a new method to model magnetic anomalies on Mars
      • We present evidence that the dynamo was active during the Hesperian epoch
      • We present evidence of magnetic reversals and true polar wander
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      Ion densities and composition of Titan's upper atmosphere derived from the Cassini Ion Neutral Mass Spectrometer: Analysis methods and comparison of measured ion densities to photochemical model simulations

      Kathleen E. Mandt, David A. Gell, Mark Perry, J. Hunter Waite Jr., Frank A. Crary, David Young, Brian A. Magee, Joseph H. Westlake, Thomas Cravens, Wayne Kasprzak, Greg Miller, Jan-Erik Wahlund, Karin Ågren, Niklas J. T. Edberg, Alan N. Heays, Brenton R. Lewis, Stephen T. Gibson, V. de la Haye and Mao-Chang Liang

      Article first published online: 12 OCT 2012 | DOI: 10.1029/2012JE004139

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      Key Points

      • Importance of environmental conditions for analysis of Cassini INMS ion data
      • Role of INMS ion densities in validating Titan photochemical model simulations
      • Production and loss of primary photoionization products is not fully understood
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      Can a sinking metallic diapir generate a dynamo?

      Julien Monteux, Nathanaël Schaeffer, Hagay Amit and Philippe Cardin

      Article first published online: 10 OCT 2012 | DOI: 10.1029/2012JE004075

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      Key Points

      • We model the flow within a sinking metallic diapir in a rotating planet
      • Dynamo generation needs large diapirs sinking through partially molten mantle
      • Equatorial sinking diapirs produce stronger saturated magnetic fields
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      Solar-Storm/Lunar Atmosphere Model (SSLAM): An overview of the effort and description of the driving storm environment

      W. M. Farrell, J. S. Halekas, R. M. Killen, G. T. Delory, N. Gross, L. V. Bleacher, D. Krauss-Varben, P. Travnicek, D. Hurley, T. J. Stubbs, M. I. Zimmerman and T. L. Jackson

      Article first published online: 9 OCT 2012 | DOI: 10.1029/2012JE004070

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      Key Points

      • The energy in solar storms has a direct impact on exposed near-airless bodies
      • SSLAM study designed to understand the impact of space weather on exposed rocky bodies
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      Textural and modal analyses of picritic basalts with ChemCam Laser-Induced Breakdown Spectroscopy

      A. Cousin, V. Sautter, C. Fabre, S. Maurice and R. C. Wiens

      Article first published online: 5 OCT 2012 | DOI: 10.1029/2012JE004132

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      Key Points

      • LIBS analyses on picritic basalts
      • Textural and modal interpretation from the LIBS spectra
      • Comparison of groundmasses
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      A new method for the measurement of meteorite bulk volume via ideal gas pycnometry

      Shijie Li, Shijie Wang, Xiongyao Li, Yang Li, Shen Liu and Ian M. Coulson

      Article first published online: 2 OCT 2012 | DOI: 10.1029/2012JE004202

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      Key Points

      • The efficient and simple method measuring the bulk volume of meteorite
      • Nondestructive and noncontaminating measurement of small sample with less error
      • Application to the study of rare samples in other fields
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      Plasma wake simulations and object charging in a shadowed lunar crater during a solar storm

      M. I. Zimmerman, T. L. Jackson, W. M. Farrell and T. J. Stubbs

      Article first published online: 17 AUG 2012 | DOI: 10.1029/2012JE004094

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      Key Points

      • Solar storms modulate lunar wake morphology
      • Astronaut charging may become perpetual in PSRs
      • Solar wind ions get into polar craters and affect volatile balance
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      The effect on the lunar exosphere of a coronal mass ejection passage

      R. M. Killen, D. M. Hurley and W. M. Farrell

      Article first published online: 8 MAR 2012 | DOI: 10.1029/2011JE004011

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      Key Points

      • We simulate the lunar exosphere of Na, K, Ca, and Mg due to a CME passage
      • The change in atmospheric density is rapid
      • The CME passage will enhance the exosphere above detectability limits of LADEE

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