Polarization studies at 3. 8 cm of McMath region 12417 of 1973
Technical Report
·
OSTI ID:5369729
The strong active region McMath 12417 (SFC 158) of 1973 was observed as it moved from the east to the west limb of the sun. The observations were carried out at 3.8 cm in both left and right circular polarization with an antenna beam width of 4.4 arc min. The circular polarization of the region started as negative (-10%) near the eastern limb, reached a peak value of -23% close to the central meridian, became zero around 40 deg W and ended as positive (+7 deg) near the western limb of the sun. Drift scans through the active region indicate that the leading spot, with negative magnetic polarity, was the dominant source of radio emission beyond 40 deg W longitude. This result leads us to conclude that the dominant negative polarity emission from the leading spot was reversed due to transverse propagation through the coronal magnetic fields in a region of moderate to weak coupling. The peaking of the polarization near central meridian can be accounted for by quasi-longitudinal propagation conditions over the leading spot with dominant emission.
- Research Organization:
- Boston Univ., Mass. (USA). Dept. of Astronomy
- OSTI ID:
- 5369729
- Report Number(s):
- AD-A-042849
- Country of Publication:
- United States
- Language:
- English
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