On the E-W asymmetry and the generation of ESP events

Details On the E-W asymmetry and the generation of ESP events On the E-W asymmetry and the generation of ESP events

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984soph...93..195s&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 93, June 1984, p. 195-210.

Physics

20

Energetic Particles, Shock Waves, Solar Flares, Explorer 47 Satellite, Explorer 50 Satellite, Histograms

Scientific paper

Observations of energetic-ion-intensity enhancements (E greater than or equal to 290 keV) associated with solar-flare-generated shock waves (solar-flare ESP events), obtained during nearly a decade by the APL/JHU instruments on board the earth orbiters IMP-7 and 8, are used to examine the role of the heliolongitude-dependent large-scale shock morphology in relation to the upstream interplanetary magnetic field in the formation of these ESP events. It is shown that a clear east-west solar-hemisphere asymmetry is present in the distribution of the ESP relative-intensity enhancements with respect to the heliolongitudes of the shock-wave source-flare sites. The large ion-intensity enhancements superimposed on the ambient solar-flare ion population are preferentially associated with solar-flare sites locoated to the east of the spacecraft meridian, whereas on the average only weak ESP events are associated with solar-flare sites to the west of the spacecraft meridian. The observed asymmetry and its implications for the dominant processes in the generation of the solar-flare ESP events are discussed on the basis of this extensive survey.

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