Microscale properties of Langmuir waves observed by STEREO and CLUSTER inside solar wind magnetic holes

Details Microscale properties of Langmuir waves observed by STEREO and CLUSTER inside solar wind magnetic holes Microscale properties of Langmuir waves observed by STEREO and CLUSTER inside solar wind magnetic holes

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh13b1527s&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SH13B-1527

Physics

Plasma Physics

[7829] Space Plasma Physics / Kinetic Waves And Instabilities, [7867] Space Plasma Physics / Wave/Particle Interactions

Scientific paper

Magnetic holes, solitary large amplitude depressions in the interplanetary magnetic field, are commonly observed in the solar wind. Some of these magnetic structures are accompanied by bursts of electrostatic waves close to the electron plasma frequency localized inside the magnetic holes. In this study we used data from the S/WAVES instrument on board of the STEREO spacecraft to demonstrate the first waveform observations of these waves and to analyze their polarization and modulation. The results are complemented by multi-spacecraft Cluster observations of these phenomena, which allow to resolve the electron distribution and obtain a better description of spatio-temporal variations in Langmuir wave activity. Comparing to previous studies of this phenomenon, the high resolution of the data allows to study the structure of these waves at electron scales. We present a detailed analysis of several observed magnetic holes and discuss possible mechanisms responsible for excitation of these waves.

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