Advertisement

Solar Physics

, Volume 113, Issue 1–2, pp 241–248 | Cite as

The resistances of the photosphere and of a flaring coronal loop

  • D. B. Melrose
  • A. N. McClymont
Article

Abstract

We consider two aspects of solar flares from the point of view of circuit theory. First, we show that the so-called “dynamo models”, which invoke an analogy between the Earth's magnetosphere-ionosphere circuit and the solar corona-photosphere circuit, are illfounded. Second, we consider the rate of coronal energy release in the impulsive phase of a modest flare, and show that, if the energy going into mass motion can be neglected, the corona must present a resistance of about 10−3 μ. Classical resistivity, even in a highly filamented circuit, cannot provide so high a resistance. Anomalous resistivity due to ion sound turbulence can provide the required resistance in this case, but is insufficient to explain the very high power levels inferred in some fast spikes.

Keywords

Flare High Power Energy Release Power Level Solar Flare 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Alfven, H.: 1977, Rev. Geophys. and Space Phys. 15, 271.ADSCrossRefGoogle Scholar
  2. Duijveman, A., Hoyng, P., and Ionson, J. A.: 1981, Ap. J. 245, 721.ADSCrossRefGoogle Scholar
  3. Henoux, J.-C.: 1986, in V. E. Stepanov and V. N. Obridko (eds.) Solar Maximum Analysis, VNU Science Press, Utrecht, p. 109.Google Scholar
  4. Heyvaerts, J.: 1974, Solar Phys. 38, 419.ADSCrossRefGoogle Scholar
  5. Holman, G. D.: 1985, Ap. J. 293, 584.ADSCrossRefGoogle Scholar
  6. Kan, J. R., Akasofu, S.-I., and Lee, L. C.: 1983, Solar Phys. 84, 153.ADSCrossRefGoogle Scholar
  7. Khan, J. I.: 1987, Proc. Astron. Soc. Australia (in press).Google Scholar
  8. Kuperus, M.: 1976, Solar Phys. 47, 79.ADSCrossRefGoogle Scholar
  9. Mitchner, M., and Kruger, C. H., Jr.: 1973, Partially Ionized Gasses, Wiley, New York.Google Scholar
  10. Moreton, G. E., and Severny, A. B.: 1968, Solar Phys. 3, 282.ADSCrossRefGoogle Scholar
  11. Obayashi, T.: 1975, Solar Phys. 40, 217.ADSCrossRefGoogle Scholar
  12. Spicer, D. S.: 1977, Solar Phys. 53, 305.ADSCrossRefGoogle Scholar
  13. Spicer, D. S.: 1982, Space Sci. Rev. 31, 351.ADSCrossRefGoogle Scholar
  14. Sturrock, P. A.: 1980, in P. A. Sturrock (ed.) Solar Flares, Colorado Associated University Press, Boulder, p. 411.Google Scholar
  15. Sturrock, P. A., Kaufmann, P., Moore, R. L., and Smith, D. F.: 1984, Solar Phys. 94, 341.ADSCrossRefGoogle Scholar
  16. van Beek, H. F., de Feiter, L. D., and de Jager, C.: 1974, Space Res. 14, 447.Google Scholar

Copyright information

© D. Reidel Publishing Company 1987

Authors and Affiliations

  • D. B. Melrose
    • 1
  • A. N. McClymont
    • 1
  1. 1.Institute for Astronomy, University of HawaiiHonoluluUSA

Personalised recommendations