Computer Science
Scientific paper
May 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980nciml..28...39b&link_type=abstract
Nuovo Cimento, Lettere, Serie 2, vol. 28, May 10, 1980, p. 39-43.
Computer Science
Interplanetary Medium, Oxygen Plasma, Plasma Composition, Shock Wave Propagation, Solar Flares, Abundance, Helium, Magnetosheath, Satellite Observation, Solar Wind
Scientific paper
ISEE-2 observations of the chemical composition of the driving piston responsible for the ejection of a solar-flare-generated interplanetary shock wave are reported. Measurements of energy per unit charge spectra of the interplanetary shock wave which arrived at the earth on Nov. 25, 1977 were performed in the range 50 3V/Z to 11 keV/Z for fluxes as low as 10,000/sq cm per sec by the solar wind experiment on board the satellite, which was then outside the magnetosheath. It is shown that approximately 10 h after the shock front arrived at the earth, the intensities of the He(++) and O(+6) fluxes increased by factors of 5 and 3, respectively, accompanied by significant increases in fluxes attributed to Si(+9), Si(+8) and Si(+7) or He(+) and ions of the iron group. Heavy-ion abundances were then observed to decline for the next hour, corresponding to the passage of the shock piston. It is concluded that the plasma in the driving piston of a flare-generated shock is enriched with O(+6), as well as alpha particles reflecting the composition of the lower corona.
Bonifazi Carla
Egidi Alberto
Moreno Giovani
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