High-latitude distributions of plasma waves and spatial irregularities from DE 2 alternating current electric field observations

Details High-latitude distributions of plasma waves and spatial irregularities from DE 2 alternating current electric field observations High-latitude distributions of plasma waves and spatial irregularities from DE 2 alternating current electric field observations

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.1629h&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A2, p. 1629-1652.

Physics

23

Alternating Current, Electric Fields, Magnetohydrodynamic Waves, Plasma Waves, Spatial Distribution, Extremely Low Frequencies, Hiss, Very Low Frequencies

Scientific paper

The high-latitude spatial distributions of average signal intensities in 12 frequency channels between 4 Hz and 512 kHz as measured by the ac electric field spectrometers on the DE-2 spacecraft are analyzed for 18 mo of measurements. In MLT-INL (magnetic local time-invariant latitude) there are three distinct distributions that can be identified with 4-512 Hz signals from spatial irregularities and Alfven waves, 256-Hz to 4.1-kHz signals from ELF hiss, and 4.1-64 kHz signals from VLF auroral hiss, respectively. Overlap between ELF hiss and spatial irregularity signals occurs in the 256-512 Hz band. VLF hiss signals extend downward in frequency into the 1.0-4.1 kHz band and upward into the frequency range 128-512 kHz. The distinctly different spatial distribution patterns for the three bands, 4-256 Hz, 512-1204 Hz, and 4.1-64 kHz, indicate a lack of any causal relationships between VLF hiss, ELF hiss, and lower-frequency signals from spatial irregularities and Alfven waves.

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