Longitudinal development of a substorm brightening arc
Copyright policy )Longitudinal development of a substorm brightening arc
Abstract. We present simultaneous THEMIS-ground observations of longitudinal (eastward) extension of a substorm initial-brightening arc at Gillam (magnetic latitude: 65.6°) at 08:13 UT on 10 January 2008. The speed of the eastward arc extension was ~2.7 km/s. The extension took place very close to the footprints of the longitudinally separated THEMIS E and D satellites at ~12 RE. The THEMIS satellites observed field dipolarization, weak earthward flow, and pressure increase, which propagated eastward from E to D at a speed of ~50 km/s. The THEMIS A satellite, located at 1.6 RE earthward of THEMIS E, observed fluctuating magnetic field during and after the dipolarization. The THEMIS E/D observations suggest that the longitudinal extension of the brightening arc at substorm onset is caused by earthward flow braking processes which produce field dipolarization and pressure increase propagating in longitude in the near-earth plasma sheet.
- Max Planck Society Germany
- University of Calgary Canada
- University of California, Berkeley United States
- University of California Los Angeles United States
- Space Sciences Laboratory United States
QC801-809, VDP::Mathematics and natural science: 400::Physics: 430::Space and plasma physics: 437, Science, Physics, QC1-999, Q, Geophysics. Cosmic physics, VDP::Mathematics and natural science: 400::Physics: 430::Astrophysics, astronomy: 438, VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Astrofysikk, astronomi: 438, VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Rom- og plasmafysikk: 437
QC801-809, VDP::Mathematics and natural science: 400::Physics: 430::Space and plasma physics: 437, Science, Physics, QC1-999, Q, Geophysics. Cosmic physics, VDP::Mathematics and natural science: 400::Physics: 430::Astrophysics, astronomy: 438, VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Astrofysikk, astronomi: 438, VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Rom- og plasmafysikk: 437
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