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  • SOLAR PHYSICS  (2)
  • 1985-1989  (2)
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  • 1
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    Unknown
    Precompaction irradiation effects: Particles from an early active sun? (1986)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Two recent studies have shown that solar flare irradiated grains from Murchison and Kapoeta have excess spallogenic Ne-21 compared to unirradiated grains, indicating large precompaction particle irradiation effects. The quantity of cosmogenic neon in these grains presents serious difficulties for either galactic cosmic ray or normal solar flare sources. In the first study it was suggested that the effect might be the result of exposure to an early active sun. The more recent experiment both confirms the earlier results and provides constraints on the characteristic energy spectrum on the irradiation. The first results were obtained from Murchison olivines and Kapoeta pyroxenes by mass spectrometric analysis of sets of grains selected on the basis of the presence or absence of solar flare particle tracks. In the second work plagioclase feldspar grains from Kapoeta were studied.
    Keywords: SOLAR PHYSICS
    Type: Lunar and Planetary Inst. Workshop on Cosmogenic Nuclides; 2 p
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Solar flare protons and alpha particles during the last three solar cycles (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: This paper presents solar-flare-associated proton and alpha-particle fluxes determined for major events from October 1972 through March 1987 (the period that represents the last part of solar cycle 20 and the whole of solar cycle 21), using data obtained by detectors on board the IMP-7 and IMP-8 satellites, along with earlier obtained data for cycle 20. It was found that the average omnidirectional flux of protons with kinetic energy above 10 MeV for cycle 21 (64/sq cm per sec) is lower than the corresponding number for cycle 20 (92/sq cm per sec) and for the cycle 19 (378/sq cm per sec). No definitive correlation was found to exist between cycle-averaged solar flare proton fluxes and peak sunspot numbers.
    Keywords: SOLAR PHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 93; 7195-720
    Format: text
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    NASA TECHNICAL REPORTS
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