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  • 1
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    Evidence for solar flare rare gases in the Khor Temiki aubrite. (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: It has been found by studying a number of gas-rich meteorites, including Khor Temiki that there is a correlation between the abundance of 'track-rich' grains and the concentration of trapped rare gases. The amount of solar flare gas in Khor Temiki is examined. It is pointed out that the Khor Temiki enstatite is an ideal sample in which to look for evidence of solar flare gases because there has been little or no diffusion loss of solar wind gases.
    Keywords: SPACE SCIENCES
    Type: Nature Physical Science; 244; Aug. 20
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  • 2
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    Great microwave bursts and hard X-rays from solar flares (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: In the present study of the microwave and hard X-ray characteristics of 13 solar flares emitting microwave fluxes greater than 500 solar flux units, simultaneous 3-35 GHz and hard X-ray observations were conducted in the 30-500 keV energy range. An analysis is conducted to determine whether the same distribution of energetic electrons can explain both emissions; tests for any correlations between them yield results suggesting that optically thick microwave emission, near the peak frequency, originates in the same electron population that produces the hard X-rays. A single temperature model and a multitemperature model were tested for consistency with the coincident X-ray and microwave spectra at microwave burst maximum; neither model, however, attempts to explain the high frequency component of the microwave spectrum.
    Keywords: SOLAR PHYSICS
    Type: Solar Physics (ISSN 0038-0938); 96; 339-356
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  • 3
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    Fossil particle tracks and uranium distributions in minerals of the vaca muerta meteorite. (1965)
    In:  Other Sources
    Details
    Publication Date: 2019-05-24
    Description: Radiochemical measurements of fossil charged particle tracks and uranium distribution in Vaca Muerta meteorite
    Keywords: SPACE SCIENCES
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  • 4
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    Great microwave bursts and hard X-rays from solar flares (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The microwave and hard X-ray charateristics of 13 solar flares that produced microwave fluxes greater than 500 Solar Flux Units were analyzed. These Great Microwave Bursts were observed in the frequency range from 3 to 35 GHz at Berne, and simultaneous hard X-ray observations were made in the energy range from 30 to 500 keV with the Hard X-Ray Burst Spectrometer on the Solar Maximum Mission spacecraft. The principal aim of this analysis is to determine whether or not the same distribution of energetic electrons can explain both emissions. Correlations were found between respective temporal characteristics and, for the first time, between microwave and hard X-ray spectral characteristics. A single-temperature and a multi-temperature model from the literature were tested for consistency with the coincident X-ray and microwave spectra at microwave burst maximum. Four events are inconsistent with both of the models tested, and neither of the models attempts to explain the high-frequency part of the microwave spectrum. A model in which the emissions above and below the peak frequency originate in two different parts of a diverging magnetic loop is proposed. With this model the entire microwave spectrum of all but one of the events is explained.
    Keywords: SOLAR PHYSICS
    Type: NASA-TM-85052 , NAS 1.15:85052
    Format: application/pdf
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  • 5
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    Composition and spectrum of particles with 0.2 or = E or = 30 MeV/nuc in the 25 January 1971 solar flare (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Keywords: SOLAR PHYSICS
    Type: Res. in the Space Sci., v. 2; 6 p
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  • 6
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    Plutonium-244 fission tracks - Evidence in a lunar rock 3.95 billion years old. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Tracks attributed to the spontaneous fission of plutonium-244 and of uranium-238 were detected in a large whitlockite crystal in the lunar breccia 14321 from the Fra Mauro formation. For a track-retention age of 3.95 b.y., the number of plutonium tracks relative to the number of uranium tracks is 0.51 plus or minus 0.15, provided that the rock was not heavily neutron-irradiated 3.95 b.y. ago.
    Keywords: SPACE SCIENCES
    Type: Science; 176; May 26
    Format: text
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  • 7
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    Extreme radiation damage in soil from Mare Fecunditatis. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: High-voltage electron microscopy has been used to compare radiation effects in micron-size soil grains from the Luna 16 site (Mare Fecunditatis) and the four Apollo landing sites. Radiation damage by heavy solar particles is strikingly greater in the Luna 16 sample than in the other four samples. It is suggested that less movement of the soil at Mare Fecunditatis has taken place, perhaps because of its proximity to the limb and consequent lower exposure to energetic electrons in the earth's magnetospheric tail, which would cause electrostatic agitation of fine particles.
    Keywords: SPACE SCIENCES
    Type: Earth and Planetary Science Letters; 13; Jan. 197
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  • 8
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    Gas-rich meteorites - Possible evidence for origin on a regolith (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The asymmetry of irradiation features of grains in the Kapoeta and Fayetteville meteorites suggests irradiation on a regolith before meteorite formation. Chondrules and broken grains require approximately 10,000 years of irradiation time between formation or fracturing and compaction into the meteorite. Shock erasure of tracks from irradiated Kapoeta feldspars requires a severe shock event during or after meteorite formation.
    Keywords: SPACE SCIENCES
    Type: Science; 183; Jan. 11
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  • 9
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    Solar flare particles - Energy-dependent composition and relationship to solar composition (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Plastic and glass track detectors on rockets and Apollo spacecraft have been used to determine the composition of particles from He to Ni at energies from 0.1 to 50 MeV per nucleon in several solar flares of widely varying intensities. At low energies the composition of solar particles is enriched in heavy elements by an amount, relative to the asymptotic high-energy composition, that increases with atomic number from Z = 2 up to at least Z = 50, that decreases with energy, and that varies from flare to flare. At high energies (usually beyond an energy of 5 to 20 MeV per nucleon) the composition becomes independent of energy and, though somewhat variable from flare to flare, approximates the composition of the solar atmosphere. A table of abundances of the even-Z elements from He to Ni (plus N) in solar particles is constructed by averaging the asymptotic high-energy abundances in several flares.
    Keywords: SOLAR PHYSICS
    Type: Astrophysical Journal; 195; Jan. 1
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  • 10
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    Nuclear tracks in lunar samples (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: An attempt is made to relate the appearance of an etched tract to the atomic number and velocity of the ion that left it using 10 MeV/nucleon Kr beams and 6 MeV/nucleon Zn beams. It was found that the etching rate along a tract in minerals and glass is a monototonic function of ionization rate thus, making particle identification possible. Results show the following were present in lunar samples: superheavy elements, cosmic rays with z greater than 26, and solar flare particles in Surveyor glass.
    Keywords: SPACE SCIENCES
    Type: NASA-CR-115266
    Format: application/pdf
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