Physics
Scientific paper
Dec 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jgr....80.4757r&link_type=abstract
Journal of Geophysical Research, vol. 80, Dec. 1, 1975, p. 4757-4761.
Physics
Energy Spectra, Proton Energy, Solar Flares, Solar Protons, Adiabatic Conditions, Chromosphere, Satellite Observation, Solar Wind, Spectral Energy Distribution
Scientific paper
Flare-produced proton (1.3-40 MeV) energy spectra from the extramagnetospheric satellite OV5-6 (1969-046B) are examined for the period from October 29 to November 5, 1972. The higher-energy portion of the spectra is further defined by simultaneous measurements obtained from the polar-orbiting satellite S72-1 (1972-076B). A turnover in the spectra below about 4 MeV is observed. The spectral shape is examined in terms of either (1) dE/dx losses in a chromospheric/coronal storage region or (2) adiabatic deceleration with an energy-dependent interplanetary diffusion coefficient. It is concluded that the data are consistent with dE/dx losses if the protons were stored at an altitude of not more than 3 solar radii. The possibility of adiabatic deceleration in the solar wind is also examined. An order-of-magnitude calculation indicates that the diffusion coefficient (10 MeV) is about 7.5 by 10 to the 21st power sq cm/sec, a value too high for diffusion-convection to be a viable explanation for the observed spectral shape.-
Hanser Frederick A.
Katz Lev
Rothwell Paul L.
Sellers Bach
Yates Kenneth G.
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