An Event of Plasma Sheet Heating Observed by INTERBALL-1 and GEOTAIL Spacecraft

Details An Event of Plasma Sheet Heating Observed by INTERBALL-1 and GEOTAIL Spacecraft An Event of Plasma Sheet Heating Observed by INTERBALL-1 and GEOTAIL Spacecraft

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999cosre..37..107s&link_type=abstract

Cosmic Research, Vol. 37, No. 2, p.107

Physics

Scientific paper

Plasma sheet parameters were simultaneously measured onboard INTERBALL-1 (~ 15RE, 01h MLT) and GEOTAIL (~22RE, 23h MLT) spacecraft during the isolated substorm development on November 16, 1995. An increase of flux of high-energetic particles was detected by both spacecraft at the substorm expansion phase. Simultaneously, a substitution of pre-existed cold and dense constituent by more rarefied and heated plasma was recorded onboard the INTERBALL spacecraft. However, such a substitution by heated plasma was recorded onboard the GEOTAIL only 1 hour later, after having recorded a series of bursty bulk flows. Based on observations of midlatitude magnetic variations, we derived the position and dynamics of the substorm current wedge. As a result, it was revealed that INTERBALL-1 was located inside the active region of the magnetosphere tail, while GEOTAIL was outside it; this fact explains the difference between plasma heating as observed onboard the two spacecraft. The localized plasma sheet heating and different response of the energetic and thermal particles at the substorm expansion phase are the novel results. These observations are discussed here in terms of the model of local burst magnetic reconnection.

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