OBSERVATIONS OF VLF HISS AT VERY LOW L VALUES.
IOWA UNIV IOWA CITY DEPT OF PHYSICS AND ASTRONOMY
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Observations of intense bursts of very-low-frequency VLF radio noise at low altitudes near the magnetic equator are reported using data from the Injun 3 satellite. The spectral characteristics of these radio noise events typically consist of hiss extending from about 1 kHz to above 8.8 kHz the highest frequency measured. These equatorial VLF hiss events are very similar to VLF hiss commonly found near the auroral zone. During the ten month lifetime of Injun 3, a total of ten VLF hiss events occurred below 35 degrees magnetic latitude with noise spectral densities exceeding 3 x 10 to the 10th power gamma squaredHz. All of these events occurred below 350 km altitude and at L values less than 1.2. Nine of the events occurred below 20 degrees magnetic latitude. These equatorial VLF hiss events are noteworthy because of their unusual region of occurrence. Whereas auroral zone VLF hiss may be attributable to the precipitation of energetic E or 10 keV charged particles, no comparable flux of charged particles is known to exist in the region where the equatorial VLF hiss occurs. Author
- Atmospheric Physics