SOME RELATIONSHIPS BETWEEN 10.7-CENTIMETER SOLAR NOISE BURSTS, FLARES, AND SHORT-WAVE FADEOUTS

Journal Article · Wed Jan 01 04:00:00 UTC 1964 · Astrophysical Journal (U.S.)

DOI:https://doi.org/10.1086/147737· OSTI ID:4080165

Harvey, G A

Relations between 1953 solar noise bursts (10.7-cm), 4527 flares, and 928 short-wave fadeouts that occurred during concurrent observing periods from July, 1957, to December, 1960, are investigated. The bursts are those that were unambiguously identified on solar patrol records; the flares are those for which at least one observer estimated the importance to be equal or greater than 1. Attention is focused on the importance and longitude of the flares, the importance and type of the fadeouts, and the intensity, energy, and type of the bursts. A simplified-type classification is used in which a burst is identified as impulsive, long-enduring, or a combination of impulsive and long-enduring parts. Events in which all three of the features---flare, fadeout, and burst--- are manifested are not exclusively of large magnitude: the flares and fadeouts range in importance from 1-- to 3+; the bursts range in maximum intensity and energy from a few units to several thousands of units. However, an increasing percentage of association is observed as the magnitude of the event increases. The type of burst is closely associated with the type of fadeout---impulsive burst with S-SWF and longenduring burst with G-SWF and Slow S-SWF. Observed differences in longitude distribution suggest that bursts unaccompanied by SWF originate in a lower level of the solar atmosphere than bursts accompanied by SWF, and long-enduring bursts accompanied by SWF originate in a lower level of the solar atmosphere than impulsive bursts accompanied by SWF. No associations were found for 70 per cent of the flares, 10 per cent of the fadeouts, and 34 per cent of the bursts. In general, these events are of small magnitude. (auth)

• Research Organization: National Research Council, Ottawa
• NSA Number: NSA-18-010738
• OSTI ID: 4080165
• Journal Information: Astrophysical Journal (U.S.), Journal Name: Astrophysical Journal (U.S.) Vol. Vol: 139; ISSN ASJOA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ASTROPHYSICS
ATMOSPHERE
EARTH
EMISSION
FREQUENCY
IONOSPHERE
MEASURED VALUES
MICROWAVES
PHYSICS
RADIATIONS
RADIO WAVES
SOLAR FLARES
SOLAR RADIATION
SUN
VARIATIONS