A study of polarization of irregular pulsations of diminishing period and their generation mechanism

Details A study of polarization of irregular pulsations of diminishing period and their generation mechanism A study of polarization of irregular pulsations of diminishing period and their generation mechanism

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992p%26ss...40.1081h&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 40, no. 8, Aug. 1992, p. 1081-1091. Research supported by National Institute

Computer Science

6

Geomagnetic Pulsations, Magnetic Storms, Plasmapause, Polarization (Waves), Ion Cyclotron Radiation, Plasmasphere

Scientific paper

Results are presented of an investigation of the polarization of IPDPs observed in Iceland and at Syowa. It is found that the IPDP event which has so far been considered to be one single event, normally consists of a few subelements (or slopes). In general, the first major element occupying the lowest frequency range is left-handed circularly polarized, and the second major element in the higher frequency range is right-handed polarized. A hypothesis is presented to account for these observational facts. The protons with higher energy during the first injection seem to encounter the bulge of the plasmasphere or plasmatail in the LT sector of 15-18 h and at L = 6-8, which would result in the generation of ion cyclotron waves. The delay time of the drift of protons for the first injection in a time-dependent convection electric field is calculated and compared with the observed time delay and the slope of the fine structures. If it is assumed that protons with lower energy are injected during a subsequent burst, they meet the plasmapause body at L of less than 5 and at LT of greater than 18 hr and, due to the ionospheric duct propagation over the great distance between the generation region and the observing stations, the polarization in Iceland would be right-handed, which is consistent with observations.

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