Particle bursts above the high latitude northern hemisphere: nightside Interball-2 observations.

Details Particle bursts above the high latitude northern hemisphere: nightside Interball-2 observations. Particle bursts above the high latitude northern hemisphere: nightside Interball-2 observations.

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999czjph..49..733s&link_type=abstract

Czech. J. Phys., Vol. 49, No. 4a, p. 733 - 744

Mathematics

Probability

Aurorae: Bursts

Scientific paper

The first results of a statistical analysis of short term medium energy (≍1 keV) particle bursts, observed by Interball-2 at high invariant latitudes (up to 81°) above the nightside northern hemisphere, are presented. These particle bursts are believed to be detected during crossings of the plasma flux tubes which contain auroral forms detached from the nightside auroral oval. Those auroral forms may persist up to ten minutes or more, and they are detected by the onboard particle instruments as a rather short term (time of detection is approximately several minutes) bursts of particles. For a period of October and November 1996, the author has collected a data set of 228 such particle bursts. A comparison of the author's data set with the IMF and solar wind data available from the ISTP program revealed the following: 1) high latitude particle bursts were observed on 30% of all Interball-2 passes above the nightside northern hemisphere; 2) burst occurrence probability does not depend strongly on the IMF and global magnetic activity conditions. The author suggests that most of the observed particle bursts originated from the plasma sheet (PS) or plasma sheet boundary layer (PSBL). This implies a large scale PS/PSBL interchange instability, which can occur intermittently at any magnetic activity level and results in plasma filaments formation on field lines generally ascribed to the tail lobe. Therefore, the poleward auroral oval boundary can often be highly dynamic and filamentary.

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