The Kinematic Evolution of the 2007 October CME in the Inner Corona

Details The Kinematic Evolution of the 2007 October CME in the Inner Corona The Kinematic Evolution of the 2007 October CME in the Inner Corona

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009spd....40.2112s&link_type=abstract

American Astronomical Society, SPD meeting #40, #21.12; Bulletin of the American Astronomical Society, Vol. 41, p.856

Astronomy and Astrophysics

Astronomy

Scientific paper

Based on the COR1-B and COR2-B observations from Sun-Earth Connection Coronal and Heliospheric Investigation (SECCHI) on board Solar TErrestrial RElations Observatory (STEREO), the kinematic evolution of the 2007 October 8 CME in the inner corona has been studied. This CME obviously deflected to low latitude for about 30o in the COR1-B field of view (FOV). During this stage, the central position angle (CPA) of this CME varied from 306o to 276o. After then, the CME almost propagated radially. Combined with the extrapolated magnetic field, the influence of background magnetic field on the CME deflection was studied. After the CME onset, the CME would compress the background magnetic field. The CME compressed background magnetic field would release energy to return the equilibrium state. Such process may exert a force on the CME. The magnitude of this force may correspond with the magnetic field strength and the direction of this force is along the gradient of the magnetic energy density. For this CME, based on the analysis of the extrapolated magnetic field, it is found that an equator-ward force would exert on it. Such force make the CME deflect to lower latitude region at early stage. After the CME propagated to the place near the heliospheric current sheet (HCS), the force exerted on this CME may varied to 0 and the CME propagated outward almost along the HCS. Based on these results, we suggest that the deflection of this CME at early stage may caused by the gradient of the background magnetic field energy density, the CME tend to propagate to low magnetic energy density region. Furthermore, by studyied the velocity evolution of this CME, it is found that the velocity profile of this gradual CME also undergoes multiphased evolution at early stage.

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