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  • 1
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    Interaction of a collisionless conduction front with the chromosphere and solar hard X-ray bursts (1982)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-28
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Astrophysical Journal; vol. 252
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
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    Radial variation of the solar wind speed between 1 and 15 AU (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Pioneer 10 and 11 solar wind speeds measured between 1.4 and 15.2 AU are compared with those of IMP 6, 7, and 8 measured at 1 AU for 90-day intervals centered on six solar radial alignments between 1973 and 1978. The time profile of the solar wind speed undergoes change as the distance from the sun increases, which is due to interaction of adjacent solar wind streams. Speed variations are smaller at greater radial distance and both the highest and lowest speeds disappear as radial distance increases. For periods with extremely high speed solar wind streams, the mean solar wind speed decreases as the distance from the sun increases, which must be due to the disappearance of the highest speeds of the streams with increasing distance. It is concluded that at distances from the sun greater than 30-40 AU, the solar wind behavior may closely resemble that of a radially expanding constant speed plasma.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Journal of Geophysical Research; 87; Apr. 1
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
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    Measurement of the profile of solar He I resonance lines (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: The analysis of data obtained by a rocket-borne helium-filled spectrometer employing a curve-of-growth technique in 1977 and 1980 is used in an investigation of the 584-A helium resonance line from the full solar disk. Between 6.5 and 13% of the Gaussian core area was found to be missing through self-reversal. Line widths from 1980 and 1977 were 101 + or - 10 mA and 128 + or - 20 mA full width at half maximum, respectively. No consistent relationship is found between the measured widths and solar activity.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Journal of Geophysical Research; 87; Mar. 1
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
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    A three-component model of the variability of the solar ultraviolet flux 145-200 nM (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: The variability of the ultraviolet flux between 145 and 200 nm over both the eleven-year cycle and the 27-day solar rotation period is examined in terms of chromospheric activity, as determined from ground-based observations of the CaII K chromosphere. A three-component model of the solar UV flux is developed which includes the contributions to the full disk flux from both plage and active network emission. Solar cycle and solar rotation variations derived from the model are compared with the results of satellite and rocket experiments and with the two-component model of Cook et al (1980). Finally, possible ways of improving the model are discussed.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Journal of Geophysical Research; 87; Dec. 1
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
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    Active-region evolution and solar rotation variations in solar UV irradiance, total solar irradiance, and soft X rays (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Variations in the total solar irradiance, solar UV spectral irradiance, and solar soft X-ray emission caused by active region evolution and solar rotation are analyzed by using concurrent measurements from the NIMBUS 7 and GOES satellites. The observations are interpreted by using simple empirical models that relate ground-based observations of the size and location of sunspots and plages to the full-disk temporal variations. It is found that the major dips in the photospheric total solar irradiance S, which are evident in both satellite measurements and model predictions, are usually not accompanied by outstanding enhancements in the chromospheric and upper photospheric UV spectral irradiance or coronal X rays. The main cause of this difference between the variability of S and of the UV flux is that the total chromospheric plage enhancements are not outstanding at those times when the total sunspot are outstanding. X rays are even more variable because of a much wider CMD sensitivity.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Journal of Geophysical Research; 87; Dec. 1
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
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    A magnetic cloud and a coronal mass ejection (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: An interplanetary magnetic cloud observed by the Helios 1 spacecraft was found to be associated with a coronal mass ejection observed by the NRL Solwind coronagraph on the spacecraft P78-1. The magnetic cloud was observed on June 20, 1980, when Helios 1 was at 0.54 AU and nearly 90 deg west of the earth-sun line. This was associated with a large loop-like coronal mass ejection observed over the west limb on June 18, 1980, moving toward Helios 1. The speed of the front of the event at Helios 1 was (470 + or - 10) km/s, which is close to the mean transit speed (approximately 500 km/s). The magnetic cloud was similar to others described in the literature: The magnetic field strength was higher than average; the density was relatively low; the magnetic pressure greatly exceeded the ion thermal pressure; and the magnetic field direction changed through the cloud by rotating parallel to a plane which was highly inclined with respect to the ecliptic.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Geophysical Research Letters; 9; Dec. 198
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
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    Magnetic energy storage and conversion in the solar atmosphere (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: (Previously announced in STAR as N81-33114)
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Space Science Reviews; 31; 4, 19; 1982
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
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    Spatial variation for flares observed with the gamma ray spectrometer aboard the SMM satellite (1982)
    In:  Other Sources
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    Publikationsdatum: 2019-06-28
    Beschreibung: A search is made for anisotropic X-ray bremsstrahlung photon production from relativistic electrons by studying the heliocentric angular dependence of 53 flares detected at energies above 300 keV. No evidence is found for a higher rate of detectable flares near the limb at the 80 percent confidence level. This result implies that the X-ray directivity as defined by the ratio of photon intensity at 75 deg and 0 deg of heliocentric angle is less than 1.5 above 300 keV and strongly rejects any flare model predicting X-ray production from a radial 'beam' of energetic electrons.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: (ISSN 0273-1177)
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
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    Some recent results in the interpretation of high brightness temperature microwave spike emission (1982)
    In:  Other Sources
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    Publikationsdatum: 2019-06-28
    Beschreibung: A review is presented of theoretical work on the interpretation of short duration (1-100 msec), high brightness temperature (approximately 10 to the 15th K) spikes at microwave frequencies during the impulsive phase of some solar flares. Also examined is recent work on the interpretation of the spike emission as gyrosynchrotron masering. Two alternative radiation mechanisms, stimulated plasma emission from the coherent interaction of electrostatic upper hybrid waves and from the interaction of electron plasma waves, are examined.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: (ISSN 0273-1177)
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
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    A direct observation of solar neutrons following the 0118 UT flare on 1980 June 21 (1982)
    In:  Other Sources
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    Publikationsdatum: 2019-06-28
    Beschreibung: The Gamma Ray Spectrometer on the Solar Maximum Mission satellite has observed energetic solar neutrons (greater than 50 MeV) at the earth following a solar flare that occurred on the west limb on June 21, 1980 at 01:18:20 UT. Impulsive photon emission from 10 keV to greater than 65 MeV lasting over a period of about 66 s was followed by a transient flux of 50-600 MeV neutrons incident over a 17 minute period. The peak counting rate corresponds to an average flux at the earth of (3.8 + or - 0.6) x 10 to the -2nd neutrons/sq cm s at 130 MeV. These observations indicate the emission of 3 x 10 to the 28th neutrons/sr with energies greater than 50 MeV, requiring the rapid acceleration (much less than 60 s) of protons to GeV energies during the impulsive phase of the flare.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Astrophysical Journal; vol. 263
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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