A phase locking mechanism for nongyrotropic electron distributions upstream of the Earth's bow shock

Details A phase locking mechanism for nongyrotropic electron distributions upstream of the Earth's bow shock A phase locking mechanism for nongyrotropic electron distributions upstream of the Earth's bow shock

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jgra..11006206g&link_type=abstract

Journal of Geophysical Research, Volume 110, Issue A6, CiteID A06206

Physics

Interplanetary Physics: Planetary Bow Shocks, Interplanetary Physics: Plasma Waves And Turbulence, Interplanetary Physics: Solar Wind Plasma, Interplanetary Physics: General Or Miscellaneous

Scientific paper

Observations of nongyrotropic electron distributions in the region upstream of the Earth's bow shock suggest that there exists a mechanism to lock in their phase, otherwise they would rapidly gyrophase mix into a ring-beam distribution. Measurements by the Plasma Electron and Current Experiment (PEACE) on the Cluster spacecraft have provided a way of determining the rotational period of a nongyrotropic electron distribution. For the time period studied, the rotational period is found to be ~0.5 Hz, significantly lower than the local Larmor frequency but in line with the frequency of waves observed in the local magnetic field. Detailed wave analysis has revealed that the waves are most likely ordinary right-hand whistler waves. The conclusion is that the waves provide the necessary phase locking mechanism. It is not clear whether those waves are generated by the nongyrotropic distribution or are produced by other means and then cause the observed nongyrotropy.

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