Synoptic-scale magnetometer observations of the open-closed field line boundary

Details Synoptic-scale magnetometer observations of the open-closed field line boundary Synoptic-scale magnetometer observations of the open-closed field line boundary

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa51a1923u&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SA51A-1923

Physics

[2102] Interplanetary Physics / Corotating Streams, [2740] Magnetospheric Physics / Magnetospheric Configuration And Dynamics, [2784] Magnetospheric Physics / Solar Wind/Magnetosphere Interactions, [2794] Magnetospheric Physics / Instruments And Techniques

Scientific paper

The open-closed field line boundary (OCB) of Earth's magnetosphere can be utilized as a window into the global state of the magnetospheric system. During various geomagnetic events, the OCB can vary in both size and shape; the extent of this variability is a vital component of space weather research and modeling. During the 2007-2009 solar quiet period there was a unique opportunity to identify and study the synoptic variability of the OCB during such events through use of the Polar Experiment Network for Geophysical Upper-atmosphere Investigations-Automatic Geophysical Observatory (PENGUIn-AGO) network of ground-based fluxgate magnetometers on the Antarctic continent. The magnetometers, spanning a range of latitudes and local times, measure the occurrence of standing Pc5 modes on closed magnetic field lines, as well as a long period band indicative of closed field lines extending into the magnetotail. Synthesis of this information can lead to isolating the structure and dynamics of the OCB, for example, before and during the passage of a co-rotating interaction region (CIR) or coronal mass ejection (CME). Observations were compared with results from the BATSRUS space weather model and show 83% agreement during geomagnetic quiescence. The model and the data differ during a geomagnetic storm driven by a CIR. Discrepancies between the data and the model are currently being investigated.

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