Plasma waves observed inside plasma bubbles in the equatorial <formula>F region

Details Plasma waves observed inside plasma bubbles in the equatorial <formula>F region Plasma waves observed inside plasma bubbles in the equatorial <formula>F region

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997jgr...102.4577k&link_type=abstract

Journal of Geophysical Research, Volume 102, Issue A3, p. 4577-4584

Physics

Plasma Physics

4

Ionosphere: Electric Fields, Ionosphere: Plasma Temperature And Density, Ionosphere: Plasma Waves And Instabilities, Space Plasma Physics: Waves And Instabilities

Scientific paper

Plasma waves have been detected within and around density depletions in the topside equatorial F region by the electric and magnetic field sensors of the Extremely Low Frequency Wave Analyzer (ELFWA) instrument which is part of the Low-Altitude Satellite Studies of Ionospheric Irregularities experiment on the Combined Release and Radiation Effects Satellite. The plasma waves include both electrostatic waves that have a small magnetic field component and electromagnetic waves propagating in the extraordinary mode. Thus they are not simply zero-frequency irregularities as generally assumed by previous investigators who were working without the benefit of high-sensitivity ac magnetic field measurements. The waves exhibit no resonances or cutoffs at characteristic frequencies of the plasma within the range of the ELFWA which is 2-125 Hz. They occur from late evening to early morning primarily at altitudes around 400-500 km. An example has been observed as high as 1500 km. The waves are associated with plasma depletions from a factor of 2 to a factor of 80 less than the surrounding density. The observations indicate that the waves are related to equatorial spread F.

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