Electron precipitation accompanying Pc 5 pulsations observed by the DE satellites and at a ground station

Details Electron precipitation accompanying Pc 5 pulsations observed by the DE satellites and at a ground station Electron precipitation accompanying Pc 5 pulsations observed by the DE satellites and at a ground station

Aug 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jgr...10317587n&link_type=abstract

Journal of Geophysical Research, Volume 103, Issue A8, p. 17587-17604

Physics

Plasma Physics

14

Space Plasma Physics: Wave/Particle Interactions

Scientific paper

Using data from the polar orbiting Dynamic Explorer (DE) -1 and -2 satellites and a ground-based station, we investigated electron precipitation phenomena accompanying Pc 5 pulsations. DE-2 observed oscillatory disturbances in the magnetic and electric fields in the upper ionosphere at the geomagnetic footprint of the high altitude region in which transverse Pc 5 pulsations were detected by DE-1. DE-2 observed electrons precipitating into the ionosphere with energies of several keV to several tens of keV. These electrons were accelerated in the direction of the ambient magnetic field. When Pc 5 pulsations in the H-component and periodic variations of cosmic radio noise absorption (CNA pulsations) were observed at Syowa Station, DE-2 which was in geomagnetic conjunction with Syowa Station also observed oscillatory disturbances in the magnetic and electric fields. These oscillatory disturbances are caused by small-scale field-aligned currents each with width of 0.5°-1.4° invariant latitude. This suggests that Pc 5 pulsations have a small-scale resonance structure in the radial direction. The resonance structure has a small scale comparable to the ion acoustic gyroradius, then kinetic Alfvén waves having electric fields parallel to the ambient magnetic field can arise. The parallel electric field generates a field-aligned potential drop of about 3-5 kV. Electrons accelerated by these kinetic Alfvén waves would cause CNA pulsations, the phase of which leads that of the H-component of the Pc 5 pulsations by 90° in the southern hemisphere. This is consistent with the observations at Syowa Station.

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