A DECAMETER STATIONARY TYPE IV BURST IN IMAGING OBSERVATIONS ON 2014 SEPTEMBER 6
| Autor: | Shiwei Feng, A. A. Konovalenko, A. A. Koval, Y. Volvach, Aleksander Stanislavsky, Yao Chen |
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| Rok vydání: | 2016 |
| Předmět: |
Physics
010504 meteorology & atmospheric sciences Solar flare Astronomy and Astrophysics Astrophysics Coronal loop 01 natural sciences law.invention Telescope Radio telescope Space and Planetary Science law 0103 physical sciences Coronal mass ejection Decametre 010303 astronomy & astrophysics Heliograph Main sequence 0105 earth and related environmental sciences |
| Zdroj: | The Astrophysical Journal. 826:125 |
| ISSN: | 1538-4357 |
| Popis: | First-of-its-kind radio imaging of a decameter solar stationary type IV radio burst has been presented in this paper. On 2014 September 6 the observations of type IV burst radio emission were carried out with the two-dimensional heliograph based on the Ukrainian T-shaped radio telescope (UTR-2), together with other telescope arrays. Starting at ~09:55 UT and for ~3 hr, the radio emission was kept within the observational session of UTR-2. The interesting observation covered the full evolution of this burst, "from birth to death." During the event lifetime, two C-class solar X-ray flares with peak times 11:29 UT and 12:24 UT took place. The time profile of this burst in radio has a double-humped shape that can be explained by injection of energetic electrons, accelerated by the two flares, into the burst source. According to the heliographic observations, we suggest that the burst source was confined within a high coronal loop, which was part of a relatively slow coronal mass ejection. The latter has been developed for several hours before the onset of the event. Through analysis of about 1.5 × 106 heliograms (3700 temporal frames with 4096 images in each frame that correspond to the number of frequency channels), the radio burst source imaging shows a fascinating dynamical evolution. Both space-based (GOES, SDO, SOHO, STEREO) data and various ground-based instrumentation (ORFEES, NDA, RSTO, NRH) records have been used for this study. |
| Databáze: | OpenAIRE |
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