ISSN:
1573-093X
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract Time sequences of profiles of the λ1548 line of C iv containing 51 EUV bursts observed in or near active regions are analyzed to determine the brightness, Doppler shift and line broadening characteristics of the bursts. The bursts have mean lifetimes of approximately 150s, and mean increases in brightness at burst maximum of four-fold as observed with a field of view of 2″ × 20″. Mean burst diameters are estimated to be 3″, or smaller. All but three of the bursts show Doppler shifts with velocities sometimes exceeding 75 km s−1; 31 are dominated by red shifts and 17 are dominated by blue shifts. Approximately half of the latter group have red-shifted precursors. We interpret the bursts as prominence material, such as surges and coronal rain, moving through the field of view of the spectrometer.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00150591
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