Cluster Observations of the Magnetospheric Low-Latitude Boundary Layer and Cusp During Extreme Solar Wind and Interplanetary Magnetic Field Conditions: 10 November 2004 ICME and Statistical Survey.

Details Cluster Observations of the Magnetospheric Low-Latitude Boundary Layer and Cusp During Extreme Solar Wind and Interplanetary Magnetic Field Conditions: 10 November 2004 ICME and Statistical Survey. Cluster Observations of the Magnetospheric Low-Latitude Boundary Layer and Cusp During Extreme Solar Wind and Interplanetary Magnetic Field Conditions: 10 November 2004 ICME and Statistical Survey.

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm43a1069b&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM43A-1069

Physics

2723 Magnetic Reconnection (7526, 7835), 2724 Magnetopause And Boundary Layers, 2740 Magnetospheric Configuration And Dynamics, 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

We present a study of the magnetospheric cusp response to extreme external parameters during passage of the ICME over the Earth on 10th November 2004, based on Cluster observations of the plasma properties inside the low-latitude boundary layer (LLBL)/cusp region in the dawn sector of the southern hemisphere. The Interplanetary Magnetic Field (IMF) is strongly equatorial, mostly due to the dominant dawn-dusk component. Under these conditions, occurring at the same time as pulses of solar wind dynamic pressure, the observations are very complicated. However, we suggest that in the polar region of the southern hemisphere, Cluster cross two LLBLs/cusps, spatially separated by polar cap plasma. The first LLBL/cusp is formed due to anti-parallel reconnection in the dusk sector of the southern hemisphere and the second is formed due to anti-parallel reconnection in the dawn sector of the northern hemisphere. The second LLBL/cusp is located at extremely low latitude, less than ~66.3deg ILAT. A statistical study of the location of the LLBL/cusp equatorward boundary during the ICME events on 28-29 October 2003 and 7-10 November 2004 is performed. During extreme conditions the LLBL/cusp position is off- set by -7deg ILAT from the location under normal conditions, which might be explained by the influence of the high solar wind dynamic pressure. The LLBL/cusp moves equatorward with increasing southward and northward IMF. However, the LLBL/cusp position under strong southward IMF is more poleward than expected from previous studies which could indicate some saturation in the dayside reconnection process or enhancement of the nightside reconnection rate. The LLBL/cusp position under strong northward IMF is extremely low and does not agree with the location predicted in previous studies. For the events with solar wind dynamic pressure more than 10 nPa, the LLBL/cusp position does not depend on the solar wind dynamic pressure. This might indicate some saturation in the mechanism of how the LLBL/cusp location depends on the solar wind dynamic pressure.

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