Parent-Flare Emission at 2.8 GHz as a Predictor of the Peak Absorption of Polar-Cap Events.
Abstract
Parent-flare 2.8-GHz event energy is correlated with peak riometer absorption for 47 Polar-Cap Absorption (PCA) events which occurred during the nineteenth and twentieth solar cycles. Thirty-two of these events had riometer absorption of > or = 2.0 dB. The least-squares relationship between the peak absorption (A) and the burst energy (E) is given by A(dB) = 0.0116 E to the 0.5555 power with a correlation coefficient, R, of 0.59, where E is given in sfu-min. The peak absorption predicted by this formula is within a factor of 2 of that actually observed for 22 of the 32 principal PCA events (69 percent) and within a factor of 3 for 28 of the 32 (88 percent). A correction for the effect of the interplanetary magnetic field on particle propagation is considered in the appendix. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1976
- Accession Number
- ADA037552
Entities
People
- Edward W. Cliver
Organizations
- Naval Information Warfare Systems Command