Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsh31d..06h&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SH31D-06
Physics
[2101] Interplanetary Physics / Coronal Mass Ejections, [2111] Interplanetary Physics / Ejecta, Driver Gases, And Magnetic Clouds
Scientific paper
Coronal mass ejections (CMEs) are known to be the solar driver of significant space weather variability and geomagnetic activity. The identification of many CMEs with magnetic flux ropes greatly helps in giving us a framework to think about the density and magnetic field structures within the flux rope - how this structure gets formed, how it propagates and how it interacts with Earth. To be able to forecast terrestrial activity, we must understand these questions. One question that can be answered by the STEREO observations of CMEs is to determine the orientation of the CME axis, which we take to be the axis of the magnetic flux rope. Theoretical modeling sometimes show a rotation of the axis as the flux rope propagates through the low corona. We can use the SECCHI observations to determine whether the orientation of the axis of the density structure undergoes rotation as it propagates through the corona and heliosphere. We apply the technique to many of the events observed by SECCHI including the April 3, 2010 and August 1, 2010 CMEs.
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