X-ray observations of a large-scale solar coronal shock wave

Details X-ray observations of a large-scale solar coronal shock wave X-ray observations of a large-scale solar coronal shock wave

Mar 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002a%26a...383.1018k&link_type=abstract

Astronomy and Astrophysics, v.383, p.1018-1031 (2002)

Astronomy and Astrophysics

Astrophysics

78

Sun: Corona, Sun: Flares, Sun: Radio Radiation, Sun: Uv Radiation, Sun: X-Rays, Gamma Rays, Shock Waves

Scientific paper

We report observations of a propagating disturbance in the solar corona observed in emission in soft X-ray images from the Yohkoh Soft X-ray Telescope (SXT). The disturbance was associated with a flare which began at about 09:04 UT on 1997 November 03. This flare was associated with a type II radio burst observed at decimetric-dekametric wavelengths by the Astrophysikalisches Institut Potsdam Radio Spectrograph. Hα data from Kanzelhöhe Solar Observatory show that a Moreton wave was associated with this event. Moreover, Solar and Heliospheric Observatory Extreme Ultraviolet Imaging Telescope (EIT) 195 Å data show an `EIT wave' associated with this event. Extrapolations of the leading edge of the propagating soft X-ray disturbance show a close association with both of these wave features. The soft X-ray disturbance is observed to travel with a speed of about 546 km s-1. Using Nançay Radioheliograph data we directly determine the source locations of the type II radio burst. These are found to be located close to the soft X-ray disturbance and show motions consistent with the soft X-ray motions. These results lead us to conclude that the ``SXT wave'' is the coronal counterpart of a Moreton wave, analogous to EIT waves, i.e., it is the first confirmed direct observation of a solar coronal shock wave in X-rays.

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