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The GLE-associated flare of 21 August, 1979

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Abstract

We use a variety of ground-based and satellite measurements to identify the source of the ground level event (GLE) beginning near 06∶30 UT on 21 August, 1979 as the 2B flare with maximum at ∼06∶15 UT in McMath region 16218. This flare differed from previous GLE-associated flares in that it lacked a prominent impulsive phase, having a peak ∼9 GHz burst flux density of only 27 sfu and a ≳20 keV peak hard X-ray flux of ≲3 × 10-6 ergs cm-2s-1. Also, McMath 16218 was magnetically less complex than the active regions in which previous cosmic-ray flares have occurred, containing essentially only a single sunspot with a rudimentary penumbra. The flare was associated with a high speed (≳700 km s-1) mass ejection observed by the NRL white light coronagraph aboard P78-1 and a shock accelerated (SA) event observed by the low frequency radio astronomy experiment on ISEE-3.

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Author notes

  1. S. W. Kahler

    Present address: AFGL/PHG, 01731, Hanscom AFB, MA, USA

  2. H. V. Cane (Research Assistant)

    Present address: University of Maryland, 20742, College Park, MD, USA

  3. M. J. Koomen

    Present address: Sachs/Freeman Associates, Inc., 20715, Bowie, MD, USA

Authors and Affiliations

  1. Air Force Geophysics Laboratory, 01731, Hanscom AFB, MA, USA

    E. W. Cliver

  2. American Science and Engineering, Inc., 02139, Cambridge, MA, USA

    S. W. Kahler

  3. NASA/Goddard Space Flight Center, 20771, Greenbelt, MD, USA

    H. V. Cane (Research Assistant)

  4. E. O. Hulburt Center for Space Research, Naval Research Laboratory, 20375, Washington, DC, USA

    M. J. Koomen, D. J. Michels, R. A. Howard & N. R. Sheeley Jr.

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  1. E. W. Cliver
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  2. S. W. Kahler
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  3. H. V. Cane
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  4. M. J. Koomen
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  5. D. J. Michels
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  6. R. A. Howard
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  7. N. R. Sheeley Jr.
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Cliver, E.W., Kahler, S.W., Cane, H.V. et al. The GLE-associated flare of 21 August, 1979. Sol Phys 89, 181–193 (1983). https://doi.org/10.1007/BF00211961

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