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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Advection of Martian Crustal Magnetic Fields by Ionospheric Plasma Flow Observed by the MAVEN Spacecraft

Full text
Author(s):
de Oliveira, I [1, 2] ; Fraenz, M. [2] ; Echer, E. [1] ; Franco, A. [1]
Total Authors: 4
Affiliation:
[1] Natl Inst Space Res, Sao Jose Dos Campos - Brazil
[2] Max Plank Inst Solar Syst Res, Gottingen - Germany
Total Affiliations: 2
Document type: Journal article
Source: JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS; v. 126, n. 9 SEP 2021.
Web of Science Citations: 0
Abstract

The plasma environment of Mars is highly influenced by its crustal magnetic fields. In this work, we investigate whether the crustal magnetic fields can be displaced from their original positions due to advection by ionospheric plasma flow. The ranges of interest are altitudes between 200and1000 km and solar zenith angles between 45 degrees and135 degrees. We examine magnetic field data using measurements from the Magnetometer (MAG) onboard the Mars Atmosphere and Volatile EvolutioN (MAVEN) spacecraft. We conduct statistical analyses (similar to 5 years of data) in order to investigate if horizontal shifts are observed between the data and the crustal magnetic field model by Langlais et al. (2019), . We also show two case studies of individual measurements within a specific region of Mars. The results show statistical and observational evidence that the crustal magnetic fields are often being advected towards the night-side of the planet. The displacement seems to increase exponentially as a function of altitude, reaching a horizontal shift of 100 km at 650 km altitude. Moreover, we use measurements from the SupraThermal And Thermal Ion Composition (STATIC) instrument in order to compare the dynamic pressure of ionospheric plasma flow to the magnetic pressure of the crustal magnetic fields. There are two possible causes for the displacement: a forcing by external magnetic pressure or an advection of the field to the electron fluid, which follows the ion fluid. In this paper, we argue that by the observed relation between ion fluid and displacement, the latter explanation is more probable. (AU)

FAPESP's process: 18/17098-7 - Study of Mars crustal magnetic field displacement due to its interaction with the solar wind
Grantee:Isabela de Oliveira Martins
Support Opportunities: Scholarships in Brazil - Master
FAPESP's process: 19/01716-6 - Study of Mars crustal magnetic field displacements due to its interaction with the solar wind
Grantee:Isabela de Oliveira Martins
Support Opportunities: Scholarships abroad - Research Internship - Master's degree
FAPESP's process: 17/00516-8 - A study on electron oscillations in the magnetosheath of mars with mars express observations
Grantee:Adriane Marques de Souza Franco
Support Opportunities: Scholarships abroad - Research Internship - Doctorate
FAPESP's process: 16/10794-2 - Study on Electron Oscilations in the Magnetosheath of Mars
Grantee:Adriane Marques de Souza Franco
Support Opportunities: Scholarships in Brazil - Doctorate