JpGU-AGU Joint Meeting 2020

Presentation information

[E] Oral

S (Solid Earth Sciences ) » S-EM Earth's Electromagnetism

[S-EM19] Earth and planetary magnetism: Observations, modeling, and implications on dynamics and evolution

convener:Hirokuni Oda(Institute of Geology and Geoinformation, Geological Survey of Japan, AIST), Futoshi Takahashi(Faculty of Sciences, Kyushu University), Courtney Jean Sprain(University of Florida), Yoichi Usui(Japan Agency for Marine-Earth Science and Technology)

[SEM19-01] Interpretation techniques for crustal magnetic fields in the presence of solar fields, instrument or mission challenges

★Invited Papers

*Michael E Purucker1, Dhananjay Ravat2, Benoit Langlais5, Alexander Michels3, Jack Connerney4, Suzanne McEnroe3 (1.NASA/GSFC, Greenbelt, MD, USA, 2.Univ.Kentucky, Lexington, KY, USA, 3.NTNU, Trondheim, Norway, 4.ADNET/NASA, Greenbelt, MD USA, 5.CNRS, U.Nantes, Nantes, France)

There are many excellent descriptions (cf. Blakely, Cambridge, 1995) of interpretation techniques for crustal magnetic fields. But all magnetic field data sets have been gathered in the presence of other magnetic fields that complicate the interpretation of the crustal/lithospheric field component. Magnetic fields in the heliosphere contribute directly (via the solar wind) or indirectly (via currents on the magnetopause) to the magnetic fields measured by the satellites. Instrument and mission considerations are also of importance in properly interpreting magnetic field data sets, or in combining data sets collected during multiple missions. Because space missions (MAVEN, MGS) often collect data at multiple altitudes, we also have insight into the 3-D configuration of magnetic boundaries. One of the easiest interpretational techniques to implement is to plot scatterplots of along-track magnetic field gradients, either of the radial or scalar fields, along with comparable plots of altitude above the surface. In this invited review, we will discuss novel and established interpretations from magnetic field missions to the Moon, Mars, Mercury, and the Earth.