Abstract
We report multifrequency observations of storm continuum and other radio bursts. Based on their positional study and their correlation with other coronal and photospheric features, we deduce that the storm source is located in the magnetic field lines lying above a single bipolar active region. Energetic electrons trapped in the magnetic structures above the spots must be responsible for the storm radiation. We show that spontaneous emission of Langmuir waves by anisotropic distributions can explain both storm continuum and bursts self-consistently. Whenever the collisional damping (ν c ) is more than the growth (- υ A ), there is a steady emission responsible for the continuum, and whenever ν c = -υ A (which may be satisfied randomly) there is a sudden jump in T b giving rise to bursts. The number density of energetic particles required to explain the storm continuum at 73.8, 50, and 30.9 MHz frequencies is estimated to lie in the limits n b /n e ∼ 10−10−10−9 in the context of the present observations. The brightness spectrum of the storm continuum is computed and compared with observations.
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On leave from Indian Institute of Astrophysics, Bangalore 560034, India.
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Thejappa, G., Kundu, M.R. New observations of solar noise storm radiation at decameter wavelengths. Sol Phys 132, 155–171 (1991). https://doi.org/10.1007/BF00159136
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DOI: https://doi.org/10.1007/BF00159136