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Impulsive EUV bursts observed in Civ with OSO-8

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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.

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Authors and Affiliations

  1. High Altitude Observatory, National Center for Atmospheric Research, U.S.A.

    R. Grant Athay & O. R. White

  2. University of Colorado, Boulder, Colo., U.S.A.

    R. Grant Athay & O. R. White

  3. Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, Colo., U.S.A.

    B. W. Lites

  4. Lockheed Palo Alto Research Laboratory, Palo Alto, Calif., U.S.A.

    E. C. Bruner Jr.

Authors
  1. R. Grant Athay
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  2. O. R. White
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  3. B. W. Lites
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  4. E. C. Bruner Jr.
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The National Center for Atmospheric Research is sponsored by the National Science Foundation.

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Athay, R.G., White, O.R., Lites, B.W. et al. Impulsive EUV bursts observed in Civ with OSO-8. Sol Phys 66, 357–370 (1980). https://doi.org/10.1007/BF00150591

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  • DOI: https://doi.org/10.1007/BF00150591

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