Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa44a..07m&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SA44A-07
Physics
[2704] Magnetospheric Physics / Auroral Phenomena, [2724] Magnetospheric Physics / Magnetopause And Boundary Layers, [2740] Magnetospheric Physics / Magnetospheric Configuration And Dynamics, [2784] Magnetospheric Physics / Solar Wind/Magnetosphere Interactions
Scientific paper
During the Austral winters of 2007, 2008 and 2009 the five THEMIS satellites were in favorable position to study the dayside aurora. In 2007 they were in a string of pearls configuration crossing the dayside magnetopause in quick succession. In 2008 and 2009 the satellites were separated by large distances and they were often in position to simultaneously monitor the magnetosphere while some of the satellites were inside while others were outside of magnetospheric boundaries. Satellites slightly upstream of the magnetosphere are accurate monitors of the solar wind affecting the magnetosphere. The dual channel 630 and 427.8 nm imagers at South Pole station and at other Antarctic sites of the US Polar Experiment Network for Geospace Upper-atmosphere Investigations (PENGUIn) network of Automatic Geophysical Observatories (AGO) provided the simultaneous data of the auroral response to changes in the solar wind during the Antarctic winters of these years. The THEMIS satellite positions were magnetically mapped to the auroral ionosphere to select the aurora that was most likely to be conjugate to the satellite. Special Keograms were produced which show the time-latitude behavior of the aurora at the longitude of the mapped magnetic foot point of the satellite. It is expected that the mapping is relatively accurate on the dayside because the magnetic field lines are relatively short. This procedure allowed the studying of the aurora at the foot of the magnetic field line of the THEMIS satellites when the satellites crossed the magnetopause. Most times the satellites saw multiple crossings of rapidly moving magnetospheric boundaries that moved in response to either solar wind pressure pulses or spontaneous reconnection.
Angelopoulos Vassilis
Frey Harald U.
Mende Stephen B.
Ragunathan S.
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