Long-term differential energy spectrum for solar-flare iron-group particlesA long-term solar-flare differential energy spectrum for iron-group nuclei from approximately 0.1 to approximately 600 MeV/amu is derived from track density profile measurements in sample 64455 and sample 68815. Measurements from uneroded surfaces were obtained from quench crystals of plagioclase in 64455, and a Kr-81/Kr method indicates that the exposure age of this sample is 2,010,000 yrs. The power laws which best fit the normalized track density data are reported; the energy spectrum consists of two power law curves smoothly joined together which in turn are smoothly connected to a modulated galactic cosmic-ray spectrum. Standard track production versus depth profiles can be used to determine solar-flare track exposure ages and erosion rates for lunar samples.
Document ID
19780062911
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Blanford, G. E. (Lunar and Planetary Institute Houston, Tex., United States)
Fruland, R. M. (Lunar and Planetary Inst. Houston, TX, United States)
Morrison, D. A. (NASA Johnson Space Center Houston, Tex., United States)