X-ray plasma ejections associated with coronal type II shocks

Details X-ray plasma ejections associated with coronal type II shocks X-ray plasma ejections associated with coronal type II shocks

Nov 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006a%26a...458..653s&link_type=abstract

Astronomy and Astrophysics, Volume 458, Issue 2, November I 2006, pp.653-659

Astronomy and Astrophysics

Astrophysics

6

Sun: Radio Radiation, Sun: Flares, Sun: Coronal Mass Ejections (Cmes), Sun: X-Rays, Gamma Rays

Scientific paper

Context: .Recent observations suggest that X-ray plasma ejections can drive coronal shocks and metric type IIs that are also generated in close association with the X-ray erupting features. Aims: .The physical relationship between the plasma ejections and metric type II radio bursts are studied by analyzing the characteristics of ejecta and type IIs. Methods: .We present the first comprehensive analysis of a set of 18 events of X-ray plasma ejections associated with coronal shocks inferred from metric type II radio bursts. For this study, we have utilized a list of 137 limb X-ray plasma ejection events and multi-wavelength observations from GOES X-ray, Yohkoh SXT, SOHO/LASCO, and SOHO/EIT. Results: .(i) type IIs are reported only for about 15% of the 137 limb ejections; (ii) there exists a close temporal relationship among the starting time of type IIs, the hard X-ray flare peak, and the ejecta time; (iii) there exist negative correlations between X-ray loop length and starting frequency, and between the ejecta height and starting frequency of type IIs; (iv) the type II formation height computed using the starting frequency and 1 × Newkirk electron density model is in close association with or above the height of X-ray ejecta; and (v) while there is no correlation between the speeds of type II and ejecta, there seems to be a weak correlation between the speeds of type II and CME. Conclusions: . Though the results suggest that some type IIs are generated in close association with the X-ray erupting features, it is not likely that X-ray plasma ejections are the main drivers of all coronal shocks and metric type II radio bursts due to the absence of correlation between both speeds and mostly sub-Alfenic speeds of the ejections.

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