On the Characteristics of Shocks driven by limb CMEs

Details On the Characteristics of Shocks driven by limb CMEs On the Characteristics of Shocks driven by limb CMEs

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsh23b1650x&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SH23B-1650

Physics

2101 Coronal Mass Ejections (7513), 2139 Interplanetary Shocks, 7509 Corona, 7513 Coronal Mass Ejections (2101)

Scientific paper

We investigate the characteristics of bow shocks driven by limb CMEs near the Sun, including speed, width, compression ratio, and the relationshipof the standoff distance with CME size (the radius of curvature of a CME) and shock Mach number. We choose a subset of limb CMEs with distinct association of the decameter- hectometric (DH) type II burst, which is a good evidence of the existence CME-driven shock. The DH spectral domain corresponds to plasma frequencies within the field view of the SOHO/LASCO coronagraphs. Choosing limb events has several advantages: 1) there is no projection effects for CME speed measurements, 2) it is easier to determine the width of a CME and the front bow shock, 3) there is high confidence level for the plasma density determination from the white-light CME brightness. By studying the shock stand off distance and compression ratio, we obtain the shock Mach number and the Alfven speed profile in the corona.

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