Decametric radio spectra and positions during the flare of August 28, 1966: 1522 UT
✍ Scribed by James W. Warwick
- Publisher
- Springer
- Year
- 1968
- Tongue
- English
- Weight
- 785 KB
- Volume
- 4
- Category
- Article
- ISSN
- 0038-0938
No coin nor oath required. For personal study only.
✦ Synopsis
During a period of intense decametric continuum arising near the center of the sun, there occurred additional very strong emission closely associated with the flare beginning at 1522 UT on August 28, 1966. Owing to strong ionospheric absorption from about 1527 UT on, which eliminated telecommunications interference, the frequency range over which the flare-associated emission appears is unusually large, from the upper limit of the spectrograph, 41 MHz, to about 11 MHz, where external reflection cuts off the solar signals. Strong bursts of Type III (fast drift) occur from 1527 to 1531 UT, and a complex Type II (slow drift) from 1532 to 1547 UT. As the Type-II burst progresses at frequencies from 15 to 25 MHz, Northward position shifts of many solar radii probably take place; at higher frequencies the burst moves in a complicated pattern through a much narrower range of distances to the North of the sun. Type-IV emission, from 1540 UT on, moves a large distance to the sun's North, and then, after 1600 UT, returns to a stable position quite close to the sun.