Emission mechanism for the Io-independent Jovian decameter radiation

Journal Article · Tue May 15 04:00:00 EDT 1979 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/157083· OSTI ID:6130234

Goldstein, M L; Eviatar, A

A theory of the Io-independent decameter radiation is developed. The radiation results from excitation of the electromagnetic loss-cone instability by keV electrons, stably trapped near L=6. The radiation is excited in band III of the extraordinary mode. When the effects of refraction are estimated, it is shown that above 10 MHz radiation is beamed into the equatorial plane in a wide, but thin, conical sheet (Psiapprox. =80/sup 0/). When the instability analysis is coupled with one of the octopole models of the Jovian magnetic field, the maximum convective growth of the instability occurs in the directions of the non-Io A, B, and C sources. The shape of the peak radio flux frequency spectrum is found to be a consequence of the loss-cone shape of the electron distribution function.

• Research Organization: NASA Goddard Space Flight Center, Laboratory for Extraterrestrial Physics
• OSTI ID: 6130234
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 230:1; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640107* -- Astrophysics & Cosmology-- Planetary Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ATMOSPHERES
CLOSED CONFIGURATIONS
ELECTROMAGNETIC RADIATION
INSTABILITY
JUPITER PLANET
LOSS CONE
LOSS CONE INSTABILITY
MAGNETIC FIELD CONFIGURATIONS
MAGNETIC FIELDS
MULTIPOLAR CONFIGURATIONS
OCTUPOLAR CONFIGURATIONS
PLANETARY ATMOSPHERES
PLANETARY MAGNETOSPHERES
PLANETS
PLASMA
PLASMA INSTABILITY
PLASMA MICROINSTABILITIES
RADIATIONS
RADIOWAVE RADIATION
REFRACTION
WAVE PROPAGATION