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  • 1970-1974  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Hard solar flare X-ray Bursts on 8 December 1970 (1974)
    Springer
    Solar physics 35 (1974), S. 419-430 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Hard X-ray bursts have been observed from two 1B flares located in the same sunspot region and separated in time by about 70 min on 8 December 1970. The bursts are composed by many ‘flashes’ of 2 to 20 seconds duration. Power spectrum analysis reveals no strong periodicities although a significant peak appears at 7.5 s. The characteristic times of 2 to 20 s do not seem likely to be electron transit times since the flare size is so small. These times are evidently connected with the acceleration of the electrons. Fitting Takakura's model of the radio noise region to the observations we find this region to be small but the density of electrons above 100 keV is high, on the order of 107 cm-3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00151965
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Unknown
    Hard solar flare X-ray Bursts on 8 December 1970 (1974)
    Springer
    Details
    Publication Date: 1974-04-01
    Print ISSN: 0038-0938
    Electronic ISSN: 1573-093X
    Topics: Physics
    Published by Springer
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    PAPER CURRENT
  • 3
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    Hard solar flare X-ray bursts on 8 December 1970 (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Hard X-ray bursts have been observed from two 1B flares located in the same sunspot region and separated in time by about 70 minutes on Dec. 8, 1970. The bursts are composed by many 'flashes' of 2 to 20 seconds duration. Power spectrum analysis reveals no strong periodicities although a significant peak appears at 7.5 sec. The characteristic times of 2 to 20 sec do not seem likely to be electron transit times since the flare size is so small. These times are evidently connected with the acceleration of the electrons. Fitting Takakura's model of the radio noise region to the observations, this region is found to be small, but the density of electrons above 100 keV is high, on the order of 10 million per cu cm.
    Keywords: SPACE RADIATION
    Type: Solar Physics; 35; Apr. 197
    Format: text
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    NASA TECHNICAL REPORTS
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