Very Large Array Observations of the Evolving Source Regions and Initial Onset of Coronal Mass Ejections and Eruptive EUV Events

Details Very Large Array Observations of the Evolving Source Regions and Initial Onset of Coronal Mass Ejections and Eruptive EUV Events Very Large Array Observations of the Evolving Source Regions and Initial Onset of Coronal Mass Ejections and Eruptive EUV Events

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsp23a..06w&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SP23A-06

Other

7509 Corona, 7513 Coronal Mass Ejections, 7534 Radio Emissions

Scientific paper

Very Large Array (VLA) observations at decimetric and metric wavelengths are combined with data from the SOHO EIT, and LASCO to study the source regions of coronal mass ejections and eruptive EUV events. On one day, the passage of a CME and an associated EUV ejection event coincided with an increase in the 91 cm brightness temperature of an extended coronal loop located a significant distance away and with the displacement of the 91 cm source during the early stage of the CME.. We suggest that the energy deposited into the corona by the CME may have caused a local increase in the thermal or nonthermal electron density or in the electron temperature in the middle corona resulting in a transient increase in the brightness of the 91 cm loop. The loop-like CME appeared to have had one footpoint rooted on the disk near the west limb, and the other behind the limb where the radio emission was occulted by the disk. The observed projected motion of the 91 cm source, with a speed of v 28 km/sec, represents the initial sideways expansion speed of the CME loop. To our knowledge, this component of the CME motion has not been determined before in such a direct way on the disk.

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