On the Polarization and Origin of Auroral Kilometric Radiation.
Abstract
Observations of radio emissions by the Hawkeye 1 satellite at low altitudes over the southern hemisphere have now provided measurements at radial distances from about 1.5 to 2.5 R sub e along the auroral field lines, in the region where the intense nightside auroral kilometric radiation is believed to be generated. These measurements provide new evidence on the mode of propagation and origin of the auroral kilometric radiation. In the local evening region, where the intense auroral kilometric radiation is believed to be generated, a few events have been detected for which no low frequency cutoff is evident. In these cases the auroral kilometric radiation appears to merge essentially continuously into a band of intense auroral hiss which extends downward to frequencies as low as 1 kHz. These observations suggest that the generation of the whistler-mode auroral hiss and the escaping auroral kilometric radiation are very closely related. Possible mechanisms which could produce strong coupling between the whistler-mode and the escaping free space electromagnetic modes are discussed. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1977
- Accession Number
- ADA044803
Entities
People
- Donald A. Gurnett
- James Lauer Green
Organizations
- University of Iowa