Storm/Substorm Signatures in the Outer Radiation Belt

Details Storm/Substorm Signatures in the Outer Radiation Belt Storm/Substorm Signatures in the Outer Radiation Belt

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999smc..conf.....k&link_type=abstract

Technical Report, AD-A359859; TR-98(85700)-5; SMC-TR-98-39 Technology Operations

Computer Science

Outer Radiation Belt, Magnetic Storms, Magnetospheres, Ring Currents, Crres (Satellite)

Scientific paper

The response of the ring current region is compared for periods of storm and substorm activity, with an attempt to isolate the contributions of both processes. We investigate CRRES particle data in an overview format that allows the display of long-term variations of the outer radiation belt. We compare the evolution of the ring current population to indicators of storm (Dst) and substorm (AE) activity and examine compositional changes. Substorm activity leads to the intensification of the ring current at higher L (L approx. 6) and lower ring current energies compared to storms (L approx. 4). The O(+)H(+) ratio during substorms remains low, near 10%, but is much enhanced during storms (can exceed 100%). We conclude that repeated substorms with an AE approx. 900 nT lead to a deltaDst of approx. 30 nT, but do not contribute to Dst during storm main phase as substorm injections do not form a symmetric ring current during such disturbed times.

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