Polar Upstream of the Bow Shock

Details Polar Upstream of the Bow Shock Polar Upstream of the Bow Shock

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsh52b..02f&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SH52B-02

Physics

2139 Interplanetary Shocks, 2154 Planetary Bow Shocks, 7514 Energetic Particles (2114)

Scientific paper

The Cluster and Polar spacecraft have their apogees close in local time and in April 2001 these spacecraft were traversing the pre-noon regions. On 13 April, 2001 Polar's apogee was near 25 deg. magnetic latitude and it traversed the dayside plasma sheet and entered the magnetosheath and even the solar wind near apogee. The Cluster satellites were upstream of the bow shock during the 0400-1200 UT interval of interest. The event occurred during the recovery phase of a magnetic storm. An interplanetary shock was observed at ACE near 0705 UT and reached Earth near 0735 UT on this day. At the initial shock arrival, the solar wind pressure increased by a factor of three and the solar wind speed increased from 590 to 760 km/sec, but Polar stayed inside the plasma sheet. Near 0935 UT the solar wind density and pressure rose by an order of magnitude and Polar passed from the plasma sheet into a magnetosheath like plasma. As the event continued, Polar passed into the solar wind. During this interval the Cluster satellites observed a very intense and hot solar wind population and the interplanetary field turned strongly southward. Polar observed a burst of hot plasma and energetic particles near 1020 and 1040 UT as the field became less southward. Polar reentered the magnetosheath near 1100 UT as the dynamic pressure dropped rapidly and the IMF turned northward. Polar experienced a second short transition into the solar wind near 1245 UT, and returned into a magnetosheath-like plasma for the next few hours. While in the solar wind, Polar observed transitory fluxes of very energetic ions which may be bow-shock associated, leakage from the compressed magnetosphere or possibly hot flow anomalies. We will discuss the combined Polar-Cluster observations during this event with emphasis on the source of the energetic ions observed upstream of the bow shock.

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