High-resolution energetic particle measurements at 6.6RE 3. Low-energy electron anisotropies and short-term substorm predictions

Details High-resolution energetic particle measurements at 6.6RE 3. Low-energy electron anisotropies and short-term substorm predictions High-resolution energetic particle measurements at 6.6RE 3. Low-energy electron anisotropies and short-term substorm predictions

Oct 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83.4863b&link_type=abstract

Journal of Geophysical Research, Volume 83, Issue A10, p. 4863-4868

Mathematics

Probability

14

Scientific paper

Multiple detectors giving nearly complete 4π coverage of particle pitch angle distributions have provided high resolution measurements (in energy and time) of 30- to 300-keV electrons. Data from a spacecraft (1976-059A) in geostationary orbit show a remarkably consistent sequence of variations of the electron anisotropy before and during magnetospheric substorms. For periods typically 1-2 hours prior to the onset of substorms, electron distributions, peaked along the direction of the local magnetic field, are observed in the premidnight sector. These cigarlike anisotropies are accompanied by a local taillike magnetic field which may develop further during the event. At substorm onset an abrupt transition usually occurs from the cigar-shaped distributions to pancake-shaped distributions. This anisotropy sequence may be due to the buildup and subsequent release of stresses in the magnetotail; the cigar phase may also be due to associated processes at the dayside magnetopause causing a loss of 90° pitch angle particles. The present observations, based on ~100 events, appear to provide a predictive tool for assessing the probability of occurrence of a substorm.

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