Observations of plasma waves in magnetic holes

Details Observations of plasma waves in magnetic holes Observations of plasma waves in magnetic holes

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aipc..382..305l&link_type=abstract

Proceedings of the eigth international solar wind conference: Solar wind eight. AIP Conference Proceedings, Volume 382, pp. 305

Physics

1

Interplanetary Magnetic Fields, Electrostatic Waves And Oscillations, Electromagnetic Waves

Scientific paper

Langmuir waves are often excited within magnetic holes, which are characterized by the depression of magnetic field strength. The waves occur in various types of holes: with or without directional change in the magnetic field across the holes and with deep or shallow depressions in the field magnitude. They are observed throughout the interplanetary medium, from the ecliptic plane to the solar polar region, in low and high speed solar wind streams. In the holes with directional discontinuities at the boundary, waves often occur at the edges of the holes. The electron beams which excite the Langmuir waves may be formed through the adiabatic focusing of thermal electrons in linear magnetic holes, which leads to counterstreaming electron beams [MacDowall et al., 1995], or by local physical processes at the edges of the holes with directional discontinuities. In addition to Langmuir waves, waves at a few kHz, which are typical of Doppler-shifted ion acoustic frequencies in the solar wind, and low frequency electro-magnetic whistler mode waves are also observed within magnetic holes. In some cases the three kinds of waves are observed simultaneously within the time resolutions of our instruments. The observations of plasma waves in magnetic holes have been reported by Lin et al., [1995]. An example of such observations is shown in Figure 1.

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