SM010
Do Intrinsic Magnetic Fields Shield Planetary Atmospheres From Escaping?

Session ID#: 74054

Session Description:
The idea that an intrinsic planetary magnetic field shields a planet's atmosphere from being lost to space has been recently questioned, and a suggestion made that it would collect energy, channel it down to ionospheres, and thus enhance escape. There is no current consensus on the influence of global magnetic fields on atmospheric escape, and thus whether they are important for retention of significant atmospheres. This question is increasingly important in an era when terrestrial exoplanets are being discovered in the Habitable Zones of stars more active than our Sun. This session will focus on recent research pertaining to the influence of planetary-scale magnetic fields on atmospheric escape processes. We invite contributions from modelers, theoreticians, and observers on topics related to ion outflow from Earth, ion and neutral escape from unmagnetized objects, and the role of magnetic fields in influencing atmospheric escape from exoplanets, giant planets and small bodies.
Index Terms:

2780 Solar wind interactions with unmagnetized bodies [MAGNETOSPHERIC PHYSICS]
2784 Solar wind/magnetosphere interactions [MAGNETOSPHERIC PHYSICS]
5443 Magnetospheres [PLANETARY SCIENCES: SOLID SURFACE PLANETS]

Primary Convener:  Dave A Brain, University of Colorado at Boulder, Laboratory for Atmospheric and Space Physics, Boulder, CO, United States
Conveners:  Stanislav V Barabash, Swedish Inst Space Physics, Kiruna, Sweden, Thomas Earle Moore, NASA Goddard Space Flight Ctr, Greenbelt, MD, United States and Kanako Seki, The University of Tokyo, Tokyo, Japan
Primary Liaison:  Dave A Brain, Laboratory for Atmospheric and Space Physics, Boulder, CO, United States
 
Why planetary magnetization is not necessary for protection from atmospheric escape (491317)
Herbert Gunell1, Romain Maggiolo2, Hans Nilsson3, Gabriella Stenberg Wieser3, Rikard Slapak4, Jesper Lindkvist3, Maria Hamrin5 and Johan De Keyser6, (1)Umeå University, Umeå, Sweden, (2)BIRA/IASB, Brussels, Belgium, (3)IRF Swedish Institute of Space Physics Kiruna, Kiruna, Sweden, (4)European Incoherent Scatter Scientific Association, Kiruna, Sweden, (5)Umea Univ, Umea, Sweden, (6)Belgian Institute for Space Aeronomy, Brussels, Belgium
 
A Planetary-Scale Magnetic Field Can Enhance, Rather than Inhibit, Ionospheric Escape (Invited) (491800)
Robert J Strangeway, University of California Los Angeles, IGPP/EPSS, Los Angeles, CA, United States, Christopher T Russell, University of California Los Angeles, Department of Earth Planetary and Space Sciences, Los Angeles, CA, United States, Janet G Luhmann, University of California Berkeley, Space Sciences Laboratory, Berkeley, CA, United States, Thomas Earle Moore, NASA Goddard Space Flight Ctr, Greenbelt, MD, United States and Stanislav V Barabash, Swedish Inst Space Physics, Kiruna, Sweden
 
Effects of the IMF direction on atmospheric escape from a Mars-like planet under a weak intrinsic magnetic field condition (504800)
Shotaro Sakai1, Kanako Seki1, Naoki Terada2, Hiroyuki Shinagawa3, Ryoya Sakata1, Takashi Tanaka4 and Yusuke Ebihara5, (1)The University of Tokyo, Tokyo, Japan, (2)Tohoku University, Sendai, Japan, (3)NICT, Tokyo, Japan, (4)Kyushu University, Faculty of Science, Fukuoka, Japan, (5)Kyoto University, Research Institute for Sustainable Humanosphere, Kyoto, Japan
 
Planetward flow in the Venusian magnetotail: Similarity to the Earth and difference from Mars (511768)
Yoshifumi Futaana, IRF Swedish Institute of Space Physics Kiruna, Kiruna, Sweden, Moa Persson, Swedish Institute of Space Physics, Kiruna, Sweden, Kei Masunaga, Laboratory for Atmospheric and Space Physics, Boulder, CO, United States, Peter Kollmann, The Applied Physics Laboratory, John Hopkins University, Laurel, MD, United States and Stanislav V Barabash, Swedish Inst Space Physics, Kiruna, Sweden
 
Effects of the intrinsic magnetic field on the ion loss from ancient Mars based on multi-species MHD simulations (514906)
Ryoya Sakata1, Kanako Seki1, Shotaro Sakai2, Naoki Terada3, Hiroyuki Shinagawa4 and Takashi Tanaka5, (1)The University of Tokyo, Tokyo, Japan, (2)Hokkaido University, Sapporo, Japan, (3)Tohoku University, Sendai, Japan, (4)NICT, Tokyo, Japan, (5)Kyushu University, Faculty of Science, Fukuoka, Japan
 
Planetary Magnetic Field Control of Ion Escape from Weakly Magnetized Planets (Invited) (559540)
Hilary Lauren Egan, University of Colorado Boulder, Astrophysical and Planetary Science, Boulder, CO, United States, Riku Jarvinen, Aalto University, School of Electrical Engineering, Department of Electronics and Nanoengineering, Espoo, Finland, Yingjuan Ma, University of California Los Angeles, Los Angeles, CA, United States, Mats Holmström, IRF Swedish Institute of Space Physics Kiruna, Kiruna, Sweden and David Brain, Laboratory for Atmospheric and Space Physics, University of Colorado Boulder, Boulder, CO, United States
 
Stellar Wind Energy Influx to Intrinsic Magnetospheres (571363)
Mats Holmstrom1, Shahab Fatemi1 and Stanislav V Barabash2, (1)IRF Swedish Institute of Space Physics Kiruna, Kiruna, Sweden, (2)Swedish Inst Space Physics, Kiruna, Sweden
 
The influence of Martian crustal magnetic fields on atmospheric escape (607818)
Dave A Brain, University of Colorado at Boulder, Laboratory for Atmospheric and Space Physics, Boulder, CO, United States, Robin Ramstad, University of Colorado at Boulder, Laboratory for Atmospheric and Space Physics (LASP), Boulder, CO, United States, Yaxue Dong, University of Colorado at Boulder, Boulder, CO, United States, Kanako Seki, The University of Tokyo, Tokyo, Japan, Janet G Luhmann, University of California Berkeley, Space Sciences Laboratory, Berkeley, CA, United States, James P McFadden, Univ California Berkeley, Berkeley, CA, United States, Jasper S Halekas, University of Iowa, Department of Physics and Astronomy, Iowa City, IA, United States, Jared R Espley, Goddard Space Flight Center, Greenbelt, MD, United States, David Mitchell, Space Sciences Laboratory, University of California Berkeley, Berkeley, CA, United States, Laila Andersson, Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, CO, United States and Bruce Martin Jakosky, University of Colorado Boulder, Boulder, CO, UNITED STATES
 
The electrodynamic energy budgets of induced and intrinsic magnetospheres (618454)
Robin Ramstad, University of Colorado Boulder, Laboratory for Atmospheric and Space Physics, Boulder, CO, United States, David Brain, Laboratory for Atmospheric and Space Physics, University of Colorado Boulder, Boulder, CO, United States, Yaxue Dong, Laboratory for Atmospheric and Space Physics, Boulder, United States, Jared R Espley, Goddard Space Flight Center, Greenbelt, MD, United States, Jasper S Halekas, University of Iowa, Department of Physics and Astronomy, Iowa City, IA, United States, James P McFadden, Univ California Berkeley, Berkeley, CA, United States and Bruce Martin Jakosky, University of Colorado Boulder, Boulder, CO, UNITED STATES
 
Protect or Not Protect. That is the Question (632771)
Charles Lue, Swedish Institute of Space Physics, Kiruna, Sweden and Stanislav V Barabash, Swedish Inst Space Physics, Kiruna, Sweden
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