Ground-satellite study of a Pc 1 ion cyclotron wave event

Journal Article · Fri Sep 01 04:00:00 EDT 1989 · Journal of Geophysical Research; (USA)

DOI:https://doi.org/10.1029/JA094iA09p11855· OSTI ID:5913912

Fraser, B J; Kemp, W J; Webster, D J ^[1]

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1. Univ. of Newcastle, New South Wales (Australia)

The magnetospheric generation and propagation characteristics of ion cyclotron waves associated with a Pc 1 emission observed by a network of four middle and low-latitude ground stations are determined using ground source location techniques and ISEE 1 plasma data. The source region at L = 4.7 {plus minus} 0.7 is determined from propagation in the F{sub 2} region ionospheric duct using wave polarization characteristics at ground stations. This source is just inside the steep plasmapause seen by ISEE 1 at L = 4.9 {plus minus} 0.1. The ion cyclotron wave packet interhemispheric bounce period measured from the ground spectra increases with time from 140 to 155 s during the event but is in agreement with dispersion calculations undertaken using ISEE 1 electron density and cool to cold ion composition data in a H{sup +} plasma with 8-10% He{sup +} and <1% O{sup +} ions. The frequency of the Pc 1 emission band seen on the ground (0.5-0.8 Hz) corresponds to the propagation region between the equatorial O{sup +} cutoff frequency and the He{sup +} cyclotron frequency. Linear convective growth rate calculations inside the plasmapause show significant wave amplitudes in this band. With these results it is possible to completely describe the wave generation mechanism and the magnetosphere ionosphere propagation characteristics for the Pc 1 event.

• OSTI ID: 5913912
• Journal Information: Journal of Geophysical Research; (USA), Journal Name: Journal of Geophysical Research; (USA) Vol. 94:A9; ISSN JGREA; ISSN 0148-0227
• Country of Publication: United States
• Language: English

Related Subjects

640201* -- Atmospheric Physics-- Auroral
Ionospheric
&amp; Magetospheric Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AMPLITUDES
EARTH ATMOSPHERE
EARTH MAGNETOSPHERE
ELECTRON DENSITY
F REGION
F2 LAYER
GEOMAGNETIC FIELD
HYDROMAGNETIC WAVES
ION WAVES
IONIC COMPOSITION
IONOSPHERE
MAGNETIC FIELDS
PLANETARY IONOSPHERES
PLASMA
PLASMA WAVES
PLASMAPAUSE
POLARIZATION
PULSATIONS
WAVE PROPAGATION