Time dispersion of energetic solar particles - Unexpected velocity and species dependence | Zendy

J. O’Gallagher | Zendy; D. Hovestadt | Zendy; B. Klecker | Zendy; G. Gloeckler | Zendy; C. Y. Fan | Zendy

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Time dispersion of energetic solar particles - Unexpected velocity and species dependence

Author(s) -

J. O’Gallagher,

D. Hovestadt,

B. Klecker,

G. Gloeckler,

C. Y. Fan

Publication year - 1976

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/182276

Subject(s) - physics , solar energetic particles , solar wind , interplanetary medium , velocity dispersion , astrophysics , ion , spectral line , dispersion (optics) , coronal mass ejection , solar flare , interplanetary spaceflight , atomic physics , computational physics , astronomy , nuclear physics , plasma , optics , quantum mechanics , galaxy

The intensity-time behavior for protons and ..cap alpha..-particles, as well as for carbon, oxygen, and iron ions, has been measured following the 1974 September 19 solar flare for energies between 0.5 and approx.5 MeV per nucleon. The profiles display a time dispersion which is inversely proportional to velocity for each individual species. In addition, at a given velocity the time dispersion also depends on the charge-to-mass ratio of the ion. Based on this latter dependence, it is concluded that while carbon and oxygen are essentially fully stripped, iron nuclei are not, having an effective charge Q=10 +- 5. The observed dispersion cannot be explained by purely rigidity dependent diffusive propagation. (AIP)

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