A STUDY OF SOLAR ACTIVITY ASSOCIATED WITH POLAR-CAP ABSORPTION

Journal Article · Sun Apr 01 04:00:00 EST 1962 · J. Geophys. Research

DOI:https://doi.org/10.1029/JZ067i004p01317· OSTI ID:4819478

Warwick, C S; Haurwitz, M W

Systematic examination of all unusual solar radio and optical emission before the onset of 43 polar-cap absorption (PCA) events shows which type of solar activity most frequently precedes PCA. Thls provides an objective basis for assignment of the solar event most probably associated with each PCA event. Relations among characteristics of solar and PCA events are examined. These data present little evidence for association of PCA with solar flares that occur on the far side of the sun, nor do they indicate any significant dependence of occurrence or of delay time of PCA on position of the associated flare. Delay from flare to absorption varies from values of minutes, appropriate to the energy of the solar particles, up to hours. A relation is found between delay time and phase of the solar cycle, with long delay times near the time of maximum solar activity. (auth)

• Research Organization: National Bureau of Standards, Boulder, Colo.
• Sponsoring Organization: USDOE
• NSA Number: NSA-16-018301
• OSTI ID: 4819478
• Journal Information: J. Geophys. Research, Journal Name: J. Geophys. Research Vol. Vol: 67
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ABSORPTION
COSMIC RADIATION
EMISSION
LIGHT
MOTION
PHYSICS
POLAR-CAP ABSORPTION
PRODUCTION
RADIO WAVES
SOLAR FLARES
SPACE
SUN