| Full text | |
| Author(s): |
Gimenez de Castro, C. G.
[1, 2]
;
Raulin, J-P
[1]
;
Silva, J. F. Valle
[1]
;
Simoes, P. J. A.
[3]
;
Kudaka, A. S.
[1]
;
Valio, A.
[1]
Total Authors: 6
|
| Affiliation: | [1] Univ Presbiteriana Mackenzie, Ctr Radio Astron & Astrofis Mackenzie, Escola Engn, Sao Paulo - Brazil
[2] Consejo Nacl Invest Cient & Tecn, Inst Astron & Fis Espacio, Buenos Aires, DF - Argentina
[3] Univ Glasgow, SUPA Sch Phys & Astron, Glasgow, Lanark - Scotland
Total Affiliations: 3
|
| Document type: | Journal article |
| Source: | SPACE WEATHER-THE INTERNATIONAL JOURNAL OF RESEARCH AND APPLICATIONS; v. 16, n. 9, p. 1261-1268, SEP 2018. |
| Web of Science Citations: | 1 |
| Abstract | |
Active Region 12673 is the most productive active region of solar cycle 24: in a few days of early September 2017, four X-class and 27 M-class flares occurred. SOL2017-09-06T12:00, an X9.3 flare also produced a two-ribbon white light emission across the sunspot detected by Solar Dynamics Orbiter/Helioseismic and Magnetic Imager. The flare was observed at 212 and 405 GHz with the arcminute-sized beams of the Solar Submillimeter Telescope focal array while making a solar map and at 10 m, with a 17 arcsec diffraction-limited infrared camera. Images at 10 m revealed that the sunspot gradually increased in brightness while the event proceeded, reaching a temperature similar to quiet Sun values. From the images we derive a lower bound limit of 180-K flare peak excess brightness temperature or 7,000sfu if we consider a similar size as the white light source. The rising phase of mid-IR and white light is similar, although the latter decays faster, and the maximum of the mid-IR and white light emission is similar to 200s delayed from the 15.4-GHz peak occurrence. The submillimeter spectrum has a different origin than that of microwaves from 1 to 15 GHz, although it is not possible to draw a definitive conclusion about its emitting mechanism. (AU) | |
| FAPESP's process: | 13/24155-3 - Solar flare diagnostic in an unprecedented frequency range from microwaves to THz frequencies: challenges for interpretation (flat) |
| Grantee: | Carlos Guillermo Giménez de Castro |
| Support Opportunities: | Research Projects - Thematic Grants |