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  • 1
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    Electron beams and associated rapid fluctuations in solar flares (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Recent observations show that the rapid fluctuations in radio, hard X-ray, and H-alpha emissions are closely associated with type III and microwave (or decimetric) bursts during the impulsive and/or preimpulsive phases of solar flares. In order to clarify the physical processes of these observed phenomena, this paper proposes a tentative model of two acceleration regions A (source of type III bursts) and B (source of microwave or decimetric bursts) formed in the neutral sheet and at the top of a flaring loop, respectively; and also suggests that the electron beams streaming from region A and/or region B downward to the chromosphere are responsible for the rapid fluctuations in the different emissions mentioned above during the impulsive and/or preimpulsive phases of solar flares.
    Keywords: SOLAR PHYSICS
    Type: Solar Physics (ISSN 0038-0938); 131; 337-350
    Format: text
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  • 2
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    Microwave evidence for large-scale changes associated with a filament eruption (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: VLA observations at 6 and 20 cm wavelengths taken on August 3, 1985 are presented, showing an eruptive filament event in which microwave emission originated in two widely separated regions during the disintegration of the filament. The amount of heat required for the enhancement is estimated. Near-simultaneous changes in intensity and polarization were observed in the western components of the northern and southern regions. It is suggested that large-scale magnetic interconnections permitted the two regions to respond similarly to an external energy or mass source involved in the disruption of the filament.
    Keywords: SOLAR PHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 336; 1078-108
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  • 3
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    Coronal bright points at 6 cm wavelength (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The results of the first observations of solar coronal bright points at 6 cm wavelength using the Very Large Array (VLA), with a spatial resolution of about 1.2 arcsec, are reported. The maximum brightness temperature of the sources observed is about 30,000 K with a mean value of about 10,000 K (above the quiet sun value). The lifetime of most sources is between 5 and 20 min. The average diameter of the sources is about 5-15 arcsec. The sources are Gaussian-like near the footpoint of miniature loops and they appear in groups. The observations indicate that significant fluctuations in the brightness temperature (sometimes quasi-periodic) and in the spatial extents of these sources can occur over periods of a few minutes.
    Keywords: SOLAR PHYSICS
    Type: Solar Physics (ISSN 0038-0938); 108; 1 19
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  • 4
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    Coronal bright points at 6 and 20 centimeter wavelengths (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The paper presents the results of near-simultaneous observations of bright points at 6 and 20 cm for a time interval of 10 hr using the VLA. It is shown that, at both 6 and 20 cm, the radio sources in the quiet sun have a very close association with bipolar features seen in magnetograms and with dark features in He I 10830 A spectroheliograms. The paper discusses the associations and the distributions of size, brightness, and temporal variation of the microwave bright points. It is found that the brightness temperatures of the 6 and 20 cm bright points are in the approximate ratio 0.09:1 expected from the emission mechanism being thermal bremsstrahlung.
    Keywords: SOLAR PHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 325; 905-911
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