Computer Science
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992esasp.346..193d&link_type=abstract
In ESA, Study of the Solar-Terrestrial System p 193-198 (SEE N93-31674 12-90)
Computer Science
3
Auroral Electrojets, Flux Density, Magnetic Storms, Magnetosphere-Ionosphere Coupling, Magnetospheric Ion Density, Solar Wind, Ampte (Satellites), Mass Spectrometers, Particle Energy, Satellite Observation, Statistical Analysis
Scientific paper
A statistical study of the substorm particle energization in terms of the energy density of the major magnetospheric ions (H(+), O(+), He(++), and He(+)) is presented. The particle data came from the CHEM (CHarge-Energy-Mass) spectrometer onboard the AMPTE/CCE (Active Magnetospheric Particle Trace Explorer/Charge Composition Explorer). The correlation between energy density during substorm expansion phase and the auroral indices (AE, AU, and AL) is examined and interpreted. The most distinct result is that the ionospheric origin O(+) energy density correlates remarkably well with the AE index, while the solar wind origin He(++) energy density does not correlate at all with AE. Mixed origin H(+) and He(+) ions exhibit an intermediate behavior. Furthermore, the O(+) energy density correlates very well with the pre-onset AU index level, while there is no correlation with the pre-onset AL index. The results are interpreted as a result of solar wind magnetosphere ionosphere coupling through the internal magnetospheric dynamo: the ionosphere responds to the increased activity of the internal dynamo (which is due to the high solar wind input) and influences substorm dynamics by feeding the near Earth magnetotail with energetic ionospheric ions during late growth phase and expansion phase.
Daglis Ioannis A.
Kremser Gerhard
Sarris Emmanuel T.
Wilken Berend
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