The great solar energetic particle events of 1989 observed from geosynchronous orbit

Details The great solar energetic particle events of 1989 observed from geosynchronous orbit The great solar energetic particle events of 1989 observed from geosynchronous orbit

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....97.6219r&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A5, May 1, 1992, p. 6219-6226. Research supported by DOE.

Physics

23

Earth Orbital Environments, Solar Activity Effects, Solar Flux Density, Solar Protons, Solar Terrestrial Interactions, Geomagnetism, Solar Cycles, Solar Wind

Scientific paper

The temporal flux profiles of four intervals containing six distinct major solar energetic particle events during 1989 are compared to illustrate the uniqueness of each event. Characteristic risetime and decay time are computed for each event. During two of these events, brief order-of-magnitude increases of the proton flux are observed. They are associated with sudden commencement events and dramatic changes in the solar wind. It is concluded that these two brief events are likely the result of shock acceleration in the solar wind. The measured count rates are fitted to a spectral form which is exponential in rigidity, and the changes in spectral slope with time for each of the four intervals are examined. The effects of these events on geomagnetic activity are investigated by comparing the fluxes of greater than 30-keV electrons at geosynchronous orbit and Kp geomagnetic index during the early part of two of the solar energetic particle events.

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