High-latitude Pi2 pulsations, ELF intensity, and particle flux variations - A case study

Details High-latitude Pi2 pulsations, ELF intensity, and particle flux variations - A case study High-latitude Pi2 pulsations, ELF intensity, and particle flux variations - A case study

Publishing date

Jun 1988

URL

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988angeo...6..287g&link_type=abstract

Journals

Annales Geophysicae (ISSN 0980-8752), vol. 6, June 1988, p. 287-295. DFG-supported research.

Science

Physics

Additional info 2

9

Additional info 3

Electron Precipitation, Extremely Low Frequencies, Geomagnetic Micropulsations, Polar Regions, Whistlers, Earth Magnetosphere, Field Aligned Currents, Geomagnetic Tail, Geos 2 Satellite, Magnetic Storms, Magnetohydrodynamic Waves

Type

Scientific paper

Abstract

In the present analysis, ground magnetic observations are reported which confirm earlier results indicating that Pi2 characteristics near the break-up region are dominated by periodic fluctuations of localized upward directed field-aligned currents. Concurrent observations onboard GEOS-2 reveal clear modulations of ELF wave intensity in-phase with the ground magnetic field pulsations. These observations are interpreted in terms of a Coroniti-Kennel-type wave-wave interaction process. General magnetospheric conditions are found to be favorable for this process. However, electron flux observations do not show the theoretically predicted flux modulation. This is explained as satellite and interaction region not being collocated, and the observed ELF wave intensity modulations is regarded as indicating a periodic filling and emptying of the atmospheric loss-cone. If this electron precipitation modulation is asymmetric between the northern and southern hemisphere loss-cone, it gives rise to a modulated field-aligned current which can couple to an Alfven-wave. A crude estimate of its amplitude gives a value fraction only of that of the primary Alfven-wave generated by the collapse of the magnetotail at substorm onset.

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