Evidence of Ion and Electron Diffusion Regions at a Sub-Solar Magnetopause Reconnection Event

Details Evidence of Ion and Electron Diffusion Regions at a Sub-Solar Magnetopause Reconnection Event Evidence of Ion and Electron Diffusion Regions at a Sub-Solar Magnetopause Reconnection Event

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsm32c..10m&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #SM32C-10

Physics

7815 Electrostatic Structures, 7835 Magnetic Reconnection, 7894 Instruments And Techniques

Scientific paper

On April 1, 2001, the Polar satellite crossed the magnetic reconnection diffusion region at the subsolar magnetopause when the magnetosheath and magnetospheric magnetic fields were anti-parallel. Across a region of width ~6 ion skin depths, differential ion and electron motions and the resulting Hall magnetic and electric field signatures were observed. At the smaller scale of ~0.4 ion skin depths near the center of the magnetopause, the electron motion was decoupled from the magnetic field while bipolar parallel electric fields were observed in the vicinity of a deep minimum in the magnetic field strength. The separatricies of the reconnection region were identified as boundaries of low frequency turbulence in the electric field associated with density minima and parallel electric fields. The reconnection electric field of less than 2 mV/m corresponded to a reconnection flow less than 2% of the asymptotic Alfven speed. These observations provide unprecedented details of the diffusion region and confirm key elements of collisionless reconnection.

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