Ion Cyclotron Waves in the Inner Heliosphere (Invited)

Details Ion Cyclotron Waves in the Inner Heliosphere (Invited) Ion Cyclotron Waves in the Inner Heliosphere (Invited)

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsh43d..06j&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SH43D-06

Physics

Plasma Physics

[7800] Space Plasma Physics, [7807] Space Plasma Physics / Charged Particle Motion And Acceleration, [7823] Space Plasma Physics / Ionization Processes, [7867] Space Plasma Physics / Wave/Particle Interactions

Scientific paper

Discrete wave packets of strong narrow-band ion cyclotron waves are observed ubiquitously in the inner heliosphere from 0.3 to 1 AU, in observations by the high-resolution magnetometers on the STEREO, MESSENGER, Helios, and Venus Express missions. Occasionally, these waves appear quasi-continuously and last for tens of minutes. All waves occur nearly circularly-polarized, with magnetic perturbations transverse to the background field, propagating close to the magnetic field. These waves appear both left-hand and right-hand polarized in the spacecraft frame, consistent with the propagation of left-handed waves moving both toward and away from the Sun in the plasma frame. In the solar wind frame, the waves are left-hand polarized and below the local proton gyro-frequency. The waves are not produced locally as their frequency does not depend on local conditions. The relative amplitudes of the right- and left- handed waves are consistent with the scenario that these waves are generated closer to the Sun and damp slowly while being transported outward by the super-Alfvénic solar wind. The correlation of the wave properties with the plasma and suprathermal ion conditions will be investigated using the STEREO field and plasma data. Preliminary modeling results on the wave generation and propagation will be provided to help understand these waves.

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