Abstract
We report the study of a weak noise storm observed by the Clark Lake multifrequency radioheliograph at four frequencies. The noise storm onset was associated with a filament eruption and a gradual rise and fall in soft X-rays. We compare the noise storm emission with related emissions in other wavelengths to develop a composite scenario of the event. Using the properties of the quiet corona inferred from the simultaneously observed quiet-Sun radiation, we estimate the brightness temperature of the storm continuum, which seems to be consistent with the observations reported in Solar Geophysical Data. Superthermal particles with a temperature that is ten times the coronal electron temperature and a density of ∼ 10−3 times the coronal density are adequate to explain the observed radiation. Since the noise storm observations were made at four frequencies, we were able to obtain a brightness temperature spectrum of the storm radiation. If the storm radiation is affected in the same way as the quiet-Sun emission by inhomogeneities, the observed spectrum can be interpreted as due to propagation effects. Since the Clark Lake instrument can observe both quiet Sun and weak bursts simultaneously, we were able to estimate the propagation effects from the quiet-Sun observations and use it to correct the brightness temperature of storm radiation.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
Aubier, M., Leblanc, Y., and Boischot, A.: 1971, Astron. Astrophys. 12, 435.
Daigne, G.: 1968, Nature 220, 567.
Elgaroy, O.: 1977, Solar Noise Storms, Pergamon Press, Oxford.
Erickson, W. C.: 1984, J. Astrophys. Astron. 5, 55.
Genkin, L. G., Erukhimov, L. M., and Levin, B. N.: 1989a, Soviet Astron. Letters 15, 71.
Genkin, L. G., Erukhimov, L. M., and Levin, B. N.: 1989b, Soviet Astron. Letters 15, 71.
Gopalswamy, N.: 1990, Solar Phys. (in press).
Gopalswamy, N. and Kundu, M. R.: 1989, Solar Phys. 122, 91.
Kai, K., Melrose, D. B., and Suzuki, S.: 1985, in D. J. McLean and M. R. Labrum (eds.), Solar Radio Physics, Cambridge University Press, Cambridge, Chap. 16, p. 414.
Kerdraon, A.: 1979, Astron. Astrophys. 71, 266.
Kerdraon, A. and Mercier, C.: 1983, Astron. Astrophys. 127, 132.
Kundu, M. R.: 1965, Solar Radio Astronomy, Interscience, New York.
Kundu, M. R., Schmahl, E. J., and Fu, Q.: 1989, Astrophys. J. 336, 1078.
Kundu, M. R., Erickson, W. C., Gergely, T. E., Mahoney, M. J., and Turner, P. J.: 1983, Solar Phys. 83, 385.
Lantos, P., Kedraon, A., Rapley, G. G., and Bentley, R. D.: 1981, Astron. Astrophys. 101, 33.
Lantos, P., Alissandrakis, C. E., Gergely, T. E., and Kundu, M. R.: 1987, Solar Phys. 112, 325.
McLean, D. J.: 1973, Proc. Astron. Soc. Australia 2, 222.
McLean, D. J.: 1981, Proc. Astron. Soc. Australia 4, 132.
Melrose, D. B.: 1978, Radiophysics and Quantum Electronics 20, 945.
Melrose, D. B.: 1980, Solar Phys. 67, 357.
Melrose, D. B. and Dulk, G. A.: 1988, Solar Phys. 116, 141.
Rust, D. M., Hildner, E. and 11 co-authors: 1980, in P. A. Sturrock (ed.), Solar Flares, Colorado Assoc. University Press, p. 273.
Sheridan, K. V., Labrum, N. R., Payten, W. L, Nelson, G. J., and Hill, E. R.: 1983, Solar Phys. 83, 167.
Smerd, S. F.: 1964, Ann. Int. Geophys. Year 34, 331.
Stewart, R. T. and McLean, D. J.: 1982, Proc. Astron. Soc. Australia 4, 386.
Stewart, R. T. and Vorpahl, J.: 1977, Solar Phys. 55, 111.
Webb, D. M. and Kundu, M. R.: 1978, Solar Phys. 57, 155.
Wentzel, D. G.: 1986, Solar Phys. 103, 141.
Wild, J. P. and Smerd, S. F.: 1972, Ann. Rev. Astron. Astrophys. 10, 159.
Wild, J. P. and Zirin, H. A.: 1956, Australian J. Phys. 9, 315.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Kundu, M.R., Gopalswamy, N. Filament eruption and storm radiation at meter-decameter wavelengths. Sol Phys 129, 133–152 (1990). https://doi.org/10.1007/BF00154370
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF00154370