tailieunhanh - Evidence for polarized solar flare emission from simultaneous radio observations in Australia and Vietnam

A sample of 34 solar flares recorded in Hanoi using the VATLY radio telescope between April 2012 and January 2014 at frequencies of 1415 and MHz is compared with the corresponding observations made at 1415 MHz by the solar observatory of Learmonth (Australia). While good overall agreement is obtained, a few differences are noted and studied in some detail. In particular, the use of different feeds in Hanoi and Learmonth reveals a case of very large polarization of the flare emission. | Communications in Physics, Vol. 25, No. 1 (2015), pp. 75-90 DOI: EVIDENCE FOR POLARIZED SOLAR FLARE EMISSION FROM SIMULTANEOUS RADIO OBSERVATIONS IN AUSTRALIA AND VIETNAM NGUYEN THI THAO, NGUYEN THI PHUONG, PIERRE DARRIULAT, PHAM NGOC DIEP, DO THI HOAI, PHAM TUYET NHUNG, AND PHAM TUAN ANH VATLY, VNSC, VAST, 18 Hoang Quoc Viet, Nghia Do, Cau Giay, Hanoi, Vietnam Abstract. A sample of 34 solar flares recorded in Hanoi using the VATLY radio telescope between April 2012 and January 2014 at frequencies of 1415 and MHz is compared with the corresponding observations made at 1415 MHz by the solar observatory of Learmonth (Australia). While good overall agreement is obtained, a few differences are noted and studied in some detail. In particular, the use of different feeds in Hanoi and Learmonth reveals a case of very large polarization of the flare emission. Keywords: radio astronomy, radio emission of the Sun, solar flares, polarization. I. INTRODUCTION As a by-product of observations [1, 2] of the Sun using the VATLY radio telescope [3, 4], a sample of 34 solar flares [5] observed simultaneously in Hanoi and Learmonth [6] has been collected. These observations provide interesting material for a study of the perfomance of the VATLY radio telescope under conditions of important and rapid changes of the signal with time. The present work is an analysis of this data sample made in the spirit of revealing possible dysfunctions of the instrument which earlier studies would have been unable to reveal. The data sample under study includes 7 flares recorded in a first campaign of observation at 1415 MHz, between April and September 2012, and 27 flares recorded in a second campaign at MHz between October 2013 and January 2014. Hanoi and Learmonth are located at nearby longitudes (◦ E and ◦ E respectively) and at nearly opposite latitudes (◦ N and ◦ S respectively). The technical characteristics of the Learmonth radio .

• Vật lý
• Communications in Physics
• Polarized solar flare emission
• Simultaneous radio observations in Australia and Vietnam
• Radio emission of the Sun
• The solar observatory of Learmonth
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