The energy spectrum of Jovian electrons in interplanetary space

Details The energy spectrum of Jovian electrons in interplanetary space The energy spectrum of Jovian electrons in interplanetary space

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985icrc....4..200c&link_type=abstract

In NASA. Goddard Space Flight Center 19th Intern. Cosmic Ray Conf., Vol. 4 p 200 (SEE N85-34729 23-92)

Physics

Cosmic Rays, Energy Spectra, Voyager 1 Spacecraft, Voyager 2 Spacecraft, Flux (Rate), Interplanetary Medium, Jupiter (Planet), Kinetic Energy

Scientific paper

The energy spectrum of electrons with energies approx 10 to approx 180 MeV measured with the electron telescope on the Voyager 1 and 2 spacecraft in interplanetary space from 1978 to 1983 is studied. The kinetic energy of electrons is determined by double dE/dx measurements from the first two detectors (D1, D2) of a stack of eight solid state detectors and by the range of particle penetration into the remaining six detectors (D3 to D8) which are interleaved with tungsten absorbers. From 1978 to 1983 (radial range approx 2 to approx 12 AU) electrons of Jovian origin were clearly observable for electrons stopping in D3(e or MeV) and in D4 (E or = 8 MeV). . For electrons stopping in D5 (E or = 12 MeV), the jovian flux dominated the galactic electron flux for a period of approximately one year near the encounter with Jupiter. Jovian electrons were also observed in D6(E or = 21 Mev) 1 MeV but not in D7(E 28 MeV). A detailed interpretation of the electron variations in all energy channels depends on an accurate subtraction of background induced by energetic protons of a few 100 MeV. This substraction is facilitated by laboratory calibration results at several energies. Further results on the differential energy spectrum of Jovian electrons and limits on the maximum detected energies will be reported.

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