Physics
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aipc..382..301m&link_type=abstract
Proceedings of the eigth international solar wind conference: Solar wind eight. AIP Conference Proceedings, Volume 382, pp. 301
Physics
1
Interplanetary Magnetic Fields, Waves, Oscillations, And Instabilities In Plasmas And Intense Beams
Scientific paper
Plasma wave observations from the Ulysses spacecraft indicate that electrostatic waves at frequencies approximately equal to the electron plasma frequency fpe are commonly found in magnetic holes. Magnetic holes are short-duration reductions in the amplitude of the interplanetary magnetic field. A model of the electron dynamics in a magnetic hole suggests that the waves are generated by electron beams of thermal energies, formed by adiabatic focusing of the electrons. These waves, presumed to be Langmuir mode, will have extremely short wavelengths, of the order of 100-1000 m. Such waves, observed in the solar wind, would be significantly Doppler shifted, which can be measured by the plasma wave receiver. The prevalence of waves in magnetic holes suggests that the magnetic structures are not stable and can provide constraints on their formation and evolution.
Balogh André
Forsyth Robert J.
Kellogg Paul J.
Lin Nan
Macdowall Robert J.
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