Characteristics of dawnside mid-latitude VLF emissions associated with substorms as deduced from the two-stationed direction finding measurement

Details Characteristics of dawnside mid-latitude VLF emissions associated with substorms as deduced from the two-stationed direction finding measurement Characteristics of dawnside mid-latitude VLF emissions associated with substorms as deduced from the two-stationed direction finding measurement

Feb 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986p%26ss...34..225h&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 34, Feb. 1986, p. 225-230, 233-243. Research supported by the Japan Society f

Physics

16

Emission Spectra, Magnetic Storms, Magnetohydrodynamic Stability, Midlatitude Atmosphere, Radio Direction Finders, Very Low Frequencies, Diurnal Variations, Electron Cyclotron Heating, Plasmapause, Space Plasmas

Scientific paper

The properties of dawnside VLF emissions for six events occurring on November 26, December 19, 20, 21, and 30, 1978 are examined. The data is obtained from direction finding measurements at a station in Brorfelde in Denmark and Chambon-la-Foret in France. The types of emissions, emission frequency variations with local time, and the location of ionospheric exit regions are investigated. The characteristics of the emissions observed are: (1) the highest concentration of VLF emissions is at LT = 06.00, (2) the VLF emissions are hiss-type, (3) the region of maximum intensity is inside the plasmapause, and (4) the VLF emissions exhibit a regular frequency drift. The analysis of the data is performed using Sazhin's (1984) quasi-linear model of the cyclotron instability of substorm electrons. The relationship between the frequency increase in the midlatitude VLF emissions and the whistler dispersion is studied.

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