Characteristics of the Distant Magnetosheath: Wind Measurements at 45 to 80 Earth Radii

Details Characteristics of the Distant Magnetosheath: Wind Measurements at 45 to 80 Earth Radii Characteristics of the Distant Magnetosheath: Wind Measurements at 45 to 80 Earth Radii

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sm42d12s&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SM42D-12

Physics

2154 Planetary Bow Shocks, 2728 Magnetosheath, 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

During 1999 and 2000, the Wind spacecraft executed a series of eccentric petal orbits having apogee near 10 Earth radii (RE) and perigee near 80 RE. The line of apsides slowly precessed, moving the perigee from sunward to tailward. As a consequence, Wind frequently sampled the magnetosheath at very large down stream distances. We use the Wind measurements from these orbits to survey the magnetosheath plasma characteristics from 45 RE to 80 RE. To date we have examined 13 separate intervals for a total of 565 hours of magnetosheath observations. We find the thermal mach number is 5.6 when averaged over observations made between 45 and 55 RE, increasing to 8.4 when averaged over observations made between 75 and 80 RE. The magnetosheath proton flow speed and temperature show a relationship similar to the speed-temperature relationship observed in the solar wind, but with magnetosheath temperatures offset to higher values. The transverse fluctuations of the flow in the distant sheath are of greater amplitude than in the unperturbed solar wind. We find that flow fluctuations in the component normal to the expected magnetopause surface are 15-30 % greater in amplitude than fluctuations in the component parallel to

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