Journal article
The Influence of Interplanetary Magnetic Field Direction on Martian Crustal Magnetic Field Topology
Geophysical research letters, Vol.47(19), e2020GL087757
10/16/2020
DOI: 10.1029/2020GL087757
Abstract
Crustal magnetic fields influence a range of plasma processes at Mars, guiding the flow of energy from the solar wind into the planet's atmosphere at some locations while shielding the atmosphere at others. In this study we investigate how the topology of crustal fields varies with changes in the direction of the incoming interplanetary magnetic field (IMF). Using plasma measurements from Mars Atmosphere and Volatile Evolution (MAVEN) and Mars Global Surveyor (MGS), we identify magnetic topology throughout the Martian ionosphere and perform a statistical analysis of crustal magnetic field topology during different IMF configurations. We find that the topology of crustal field cusp regions is dependent on IMF direction and that cusps transition between open and closed topology regularly as they rotate through the nightside of Mars. Finally, we determine that cusps often become topologically closed due to reconnection with open magnetic fields in the Martian magnetotail, creating large closed loops that connect the dayside and nightside of Mars.
Key Points
Interplanetary magnetic field direction determines which crustal magnetic field cusps are open or closed to the solar wind
Crustal fields frequently transition between closed and open topology as they rotate through the nightside of Mars
As cusp fields reconnect with open field lines in the magnetotail, they form large closed field lines linking the dayside and nightside of Mars
Details
- Title: Subtitle
- The Influence of Interplanetary Magnetic Field Direction on Martian Crustal Magnetic Field Topology
- Creators
- Tristan Weber - Laboratory for Atmospheric and Space PhysicsDavid Brain - Laboratory for Atmospheric and Space PhysicsShaosui Xu - University of California, BerkeleyDavid Mitchell - University of California, BerkeleyJared Espley - Goddard Space Flight CenterJasper Halekas - University of IowaChristian Mazelle - Université Fédérale de Toulouse Midi-PyrénéesRobert Lillis - University of California, BerkeleyGina DiBraccio - Goddard Space Flight CenterBruce Jakosky - Laboratory for Atmospheric and Space Physics
- Resource Type
- Journal article
- Publication Details
- Geophysical research letters, Vol.47(19), e2020GL087757
- DOI
- 10.1029/2020GL087757
- ISSN
- 0094-8276
- eISSN
- 1944-8007
- Number of pages
- 9
- Grant note
- NASA Earth and Space Science Fellowship (80NSSC18K1247) CNES
- Language
- English
- Date published
- 10/16/2020
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984428800602771
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