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  • SOLAR PHYSICS  (6)
  • ASTROPHYSICS
  • INSTRUMENTATION AND PHOTOGRAPHY
  • 1985-1989
  • 1975-1979  (6)
  • 1977  (6)
  • 1
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    Comparison of flare bremsstrahlung resulting from energetic thermal and nonthermal electrons (1977)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: The paper investigates the behavior of the X-ray bremsstrahlung spectra resulting from two distinct types of electron distribution functions impinging on a target atmosphere during flare activity. A power-law distribution function is compared with two double-peaked Maxwellians. The results of these calculations show that it would be difficult to rule out multithermal interpretations for the emitted high-energy X-rays.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Solar Physics; 51; Jan
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 2
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    Strong convective and shock wave behavior in solar flares (1977)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: A model has been developed to study the gasdynamics of a flare region heated by a stream of energetic electrons. It is shown that the energy deposition can introduce strong chromospheric dynamical effects. As a result of fluid motion into rarefied regions, there is considerable redistribution of mass causing a profound influence on the emitted line radiation.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Journal of Quantitative Spectroscopy and Radiative Transfer; 18; Aug. 197
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
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    Solar cycle variation of magnetic flux emergence (1977)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: The number of X-ray bright points (XBP) has been measured from solar X-ray images obtained during two rocket flights in 1976. When compared with the data obtained during the Skylab mission (1973), the number is found to be higher by a factor of 2. As the probability of obtaining the result by chance is less than 1 in 5 million, it is concluded that the number of XBP has increased in the three year interval. As all other indicators of activity have decreased between 1973 and 1976, the cyclical variation of the short-lifetime end of the magnetic-flux-emergence spectrum is out of phase with the solar cycle as defined by active regions or sunspots. Since XBP in 1973 contributed more to the emerging magnetic flux than did active regions, the possibility exists that the total amount of emerging magnetic flux may be maximized at a sunspot minimum.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Astrophysical Journal; vol. 214
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
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    A comparison of solar wind streams and coronal structure near solar minimum (1977)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Solar wind data from the MIT detectors on the IMP 7 and 8 satellites and the SOLRAD 11B satellite for the solar-minimum period September-December, 1976, were compared with X-ray images of the solar corona taken by rocket-borne telescopes on September 16 and November 17, 1976. There was no compelling evidence that a coronal hole was the source of any high speed stream. Thus it is possible that either coronal holes were not the sources of all recurrent high-speed solar wind streams during the declining phase of the solar cycle, as might be inferred from the Skylab period, or there was a change in the appearance of some magnetic field regions near the time of solar minimum.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Geophysical Research Letters; 4; July 197
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
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    The gross energy balance of solar active regions (1977)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Parker's (1974) model in which sunspots denote regions of increased heat transport from the convection zone is briefly described. The amount of excess mechanically transported power supposed to be delivered to the atmosphere is estimated for a typical active region, and the total radiative power output of the active-region atmosphere is computed. It is found that only a very small fraction (about 0.001) of the sunspot 'missing flux' can be accounted for by radiative emission from the atmosphere above a spot group in the manner suggested by Parker. The power-loss mechanism associated with mass loss to the solar wind is briefly considered and shown not to be sufficient to account for the sunspot missing flux.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Solar Physics; 55; Dec. 197
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
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    August 1972 solar-terrestrial events - Observations of interplanetary shocks at 2.2 AU (1977)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Simultaneous magnetic field and plasma observations on Pioneer 10 were used to identify three shocks and a plasma driver (possible flare ejecta) at 2.2 AU caused by the four large solar flares of August 2-7, 1972. Two shocks, the first and third, were forward shocks, while the second was a reverse shock. The local inertial velocities of all three shocks were estimated under the assumption of quasi-perpendicularity, i.e., the shocks were assumed to be propagating principally across, rather than along, the interplanetary magnetic field.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Journal of Geophysical Research; 82; Mar. 1
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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