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Title: Simultaneous observations of traveling convection vortices: Ionosphere-thermosphere coupling: M-I-T COUPLING OF TCV

We present simultaneous observations of magnetosphere-ionosphere-thermosphere coupling over Svalbard during a traveling convection vortex (TCV) event. Various spaceborne and ground-based instruments made coordinated measurements, including magnetometers, particle detectors, an all-sky camera, European Incoherent Scatter (EISCAT) Svalbard Radar, Super Dual Auroral Radar Network (SuperDARN), and SCANning Doppler Imager (SCANDI). The instruments recorded TCVs associated with a sudden change in solar wind dynamic pressure. The data display typical features of TCVs including vortical ionospheric convection patterns seen by the ground magnetometers and SuperDARN radars and auroral precipitation near the cusp observed by the all-sky camera. Simultaneously, electron and ion temperature enhancements with corresponding density increase from soft precipitation are also observed by the EISCAT Svalbard Radar. The ground magnetometers also detected electromagnetic ion cyclotron waves at the approximate time of the TCV arrival. This implies that they were generated by a temperature anisotropy resulting from a compression on the dayside magnetosphere. SCANDI data show a divergence in thermospheric winds during the TCVs, presumably due to thermospheric heating associated with the current closure linked to a field-aligned current system generated by the TCVs. We conclude that solar wind pressure impulse-related transient phenomena can affect even the upper atmospheric dynamics via current systems establishedmore » by a magnetosphere-ionosphere-thermosphere coupling process.« less
Authors:
ORCiD logo [1] ;  [2] ;  [3] ;  [4] ; ORCiD logo [5] ;  [6] ; ORCiD logo [7] ;  [8] ; ORCiD logo [9] ;  [10] ; ORCiD logo [11]
  1. New Jersey Inst. of Technology, Newark, NJ (United States)
  2. Univ. of New Hampshire, Durham, NH (United States)
  3. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
  4. Dartmouth College, Hanover, NH (United States)
  5. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  6. Univ. College London (United Kingdom)
  7. Augsburg College, Minneapolis, MN (United States)
  8. Univ. of Oslo (Norway); Univ. Centre in Svalbard, Longyearbyen (Norway)
  9. Univ. Centre in Svalbard, Longyearbyen (Norway); Univ. of Bergen (Norway)
  10. Polar Geophysical Inst., Apatity (Russian Federation)
  11. Univ. of Leicester (United Kingdom)
Publication Date:
Report Number(s):
LA-UR-18-21091
Journal ID: ISSN 2169-9380
Grant/Contract Number:
AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Space Physics
Additional Journal Information:
Journal Volume: 122; Journal Issue: 5; Journal ID: ISSN 2169-9380
Publisher:
American Geophysical Union
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
National Aeronautic and Space Administration (NASA); USDOE
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; Heliospheric and Magnetospheric Physics; Plasma convection; Magnetopause and boundary layers; Magnetosphere/ionosphere interactions; Solar wind/magnetosphere interactions; Thermospheric dynamics; electromagnetic ion cyclotron waves; neutral
OSTI Identifier:
1438123