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Magnetopause Reconnection and Indents Induced by Foreshock Turbulence

Journal Article · · Geophysical Research Letters
DOI:https://doi.org/10.1029/2021GL093029· OSTI ID:1785390
 [1];  [2];  [3];  [2]
  1. NASA Goddard Space Flight Center Greenbelt MD USA
  2. NASA Goddard Space Flight Center Greenbelt MD USA, University of Maryland College Park MD USA
  3. Trinum Research, Inc. San Diego CA USA, Space Science Institute Boulder CO USA
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Abstract

Based on global hybrid simulation results, we predict that foreshock turbulence can reach the magnetopause and lead to reconnection as well as Earth‐sized indents. Both the interplanetary magnetic field (IMF) and solar wind are constant in our simulation, and hence, all dynamics are generated by foreshock instabilities. The IMF in the simulation is mostly Sun‐Earth aligned with a weak northward and zero dawn‐dusk component, such that subsolar magnetopause reconnection is not expected without foreshock turbulence modifying the magnetosheath fields. We show a reconnection example to illustrate that the turbulence can create large magnetic shear angles across the magnetopause to induce local bursty reconnection. Magnetopause reconnection and indents developed from the impact of foreshock turbulence can potentially contribute to dayside loss of planetary plasmas.

Research Organization:
Univ. of Maryland, College Park, MD (United States)
Sponsoring Organization:
National Aeronautics and Space Administration (NASA); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division
Grant/Contract Number:
SC0016278; SC0020058
OSTI ID:
1785390
Alternate ID(s):
OSTI ID: 1816428
OSTI ID: 1845025
OSTI ID: 1785393
Journal Information:
Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 11 Vol. 48; ISSN 0094-8276
Publisher:
American Geophysical Union (AGU)Copyright Statement
Country of Publication:
United States
Language:
English

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58 GEOSCIENCES
collisionless shocks
foreshock turbulence
ion escape
magnetopause reconnection
magnetosheath
planetary magnetospheres