Accession Number : AD0642577

Title :   ON SOME PROPERTIES OF SOLAR STORM BURSTS IN THE 200 MC/S REGION,

Corporate Author : OSLO UNIV (NORWAY) INST OF THEORETICAL ASTROPHYSICS

Personal Author(s) : Eckhoff,Hans Kr.

Report Date : 1966

Pagination or Media Count : 34

Abstract : More than 4000 storm bursts recorded with the swept frequency receiver at Harestua during an intense noise storm occurring in August, 1961, were analysed. From the recordings three periods were selected for a close examination. During one of these a very remarkable change in burst duration took place. The abnormal conditions lasted for some minutes and the period is henceforth referred to as the 'flash-period'. The mean 'total duration' of the storm bursts occurring outside the flash period was found to be 0.43 seconds and the mean 'total bandwidth' amounted to 5.6 Mc/s. During the flash period the mean total duration of the bursts decreased to 0.22 seconds and also the spread in burst durations diminished. No change in the distribution of burst bandwidths was found during the flash-period. Frequency drift is discussed in connection with 'flash-bursts' and ordinary type I bursts. Many complex bursts were studied by means of an isodensitometer. As a result of this a maximum duration of 0.8 seconds was established for the bursts in the material. (Author)

Descriptors :   (*SOLAR DISTURBANCES, *RADIOFREQUENCY SPECTROSCOPY), RADIO INTERFERENCE, VERY HIGH FREQUENCY, EXTRATERRESTRIAL RADIO WAVES, BANDWIDTH, FREQUENCY, DENSITOMETERS, NORWAY

Subject Categories : Astrophysics

Distribution Statement : APPROVED FOR PUBLIC RELEASE