COMPLEX PHOTOMETRIC, INTERFEROMETRIC AND IONOSPHERIC MEASUREMENTS IN THE SAR-ARC OBSERVATION REGION

Data of complex optical and ionospheric measurements in the region of SAR-arc are presented. Photometric and interferometric observations we re carried out at station Maimaga (PHI(c) approximately 56.5-degrees, LAMBDA(c) approximately 200-degrees) and vertical-incidence ionospheri c radio soundings were made at station Yakutsk (PHI(c) approximately 5 5.6-degrees, LAMBDA(c) approximately 200-degrees) and Zhigansk (PHI(c) approximately 61.2-degrees, LAMBDA(c) approximately 195-degrees). The spatial position and intensity of SAR-arcs were monitored by a meridi anal scanning photometer. The neutral component temperature was record ed with the help of the Fabry-Perot interferometer, having the field o f view of 2-degrees and directed at the zenith angle of 10-degrees sou thward; the exposure time varied from 15 to 30 min. The results have s hown that temperature increasing in arc correlates with the total inte nsity maximum. It is indicative of the relationship between the temper ature and ionospheric heating in the region of SAR-arcs. The ionospher ic data of observations indicate the appearance of F3s-reflections at the time of SAR-arc observation in the vicinity of the zenith of the v ertical-incidence radio sounding station. Experimental results suggest that the SAR-arc localization region is able to give rise to physical processes, typical of the polarization jet phenomenon, i.e., a rapid westward plasma drift, and by the presence of a northward directed ele ctric field.