Density modulated whistler mode emissions observed near the plasmapause

Details Density modulated whistler mode emissions observed near the plasmapause Density modulated whistler mode emissions observed near the plasmapause

Oct 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29t..36m&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 20, pp. 36-1, CiteID 1975, DOI 10.1029/2002GL015101

Physics

Plasma Physics

21

Magnetospheric Physics: Plasma Waves And Instabilities, Magnetospheric Physics: Plasmasphere, Space Plasma Physics: Spacecraft/Atmosphere Interactions

Scientific paper

Electron density fluctuations are regularly observed near the plasmapause together with electromagnetic waves below the electron cyclotron frequency (usually called hiss or chorus). Instruments on board CLUSTER spacecraft often observe two such emission bands with fluctuating wave intensities that suggest wave ducting in density enhancements as well as troughs. Near perigee the CLUSTER density measurements are usually limited to the electron density from 0.2 to 80 cm-3. To establish a correlation between density and wave intensity deeper inside the outer plasmasphere, we extrapolate the electron density from the spacecraft potential after fitting a relationship between observed plasma frequency and spacecraft potential. During a plasmapause crossing on June 5, 2001 (near the geomagnetic equator, L = 4 - 6, afternoon sector), density fluctuations up to hundreds cm-3 are found while whistler mode waves are observed in two separate frequency bands, at 100-500 Hz (correlated to the density fluctuations) and 3-6 kHz (anti-correlated).

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