Unusually Intense Jovian Decametric Emission Observed on 1979 March 7, 1920 - 2040 UT,
Abstract
On 1979 March 7 in the period 1920-2040 UT extremely intense Jovian decametric emissions were recorded near Sheffield. The emission was first detected after dusk when radio and communication interference fell to a low level. The emission ceased at 2041 UT. The Jovian SIII longitude and Io phase at the beginning and end of the period corresponding to a non-Io-related source of emission. Detailed analysis of the scintillation spectrum and indices made it possible to identify contributions from the ionosphere and interplanetary medium and to distinguish clearly between scattering from power-law and Cambridge small-scale irregularities. Immediately following an abrupt increase in signal intensity at 2011 UT the ionospheric Faraday scintillation virtually disappeared, leaving only the interplanetary scintillation component (IPS). This indicated (1) that the source signal was almost perfectly circularly polarized; and (2) that the contribution to the scintillation from the Jupiter ionosphere was negligible. The scintillation data indicated a 'point source' at this time with diameter < 2000 km and a possible diameter during the most intense emissions of up to 30,000 km. It appears that this event was initiated by the same solar wind sector and particles that 12-14 days previously had initiated a great magnetic storm at the Earth.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 27, 1982
- Accession Number
- ADP001450
Entities
People
- K. Bullough
- W. Gibbons
Organizations
- University of Sheffield