The Superflare SOL2017-09-06: from submm to mid-IR
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Number: | 404 |
1st Author: | Guillermo GIMENEZ DE CASTRO |
2nd Author: | |
Published: | 15 March 2021 |
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Introduction
Solar flares famously emit radiation across all electromagnetic wave bands, but we first accessed the mid-infrared (10 μm or 30 THz) only recently (Ref. [1]). The M2-class flare SOL2012-03-13T17 showed up clearly in the mid-IR, and also as a white-light flare that could be interpreted as optically thin thermal emission from precipitating electrons, as described via numerical models. Since that time several other mid-IR flares have been reported, and now we describe the remarkable X9.3 "superflare" SOL2017-09-06T12.
The superflare was one of a series of major events occurring in active region NOAA 12673, and the observations described here include mm-wave (212 and 405 GHz) observations as well as novel mid-IR imaging at 17 arc s resolution.
Observations
The mid-IR observations were obtained from a 15-cm telescope mounted on the roof of the CRAAM laboratory in the heart of São Paulo, Brazil (Ref. [2]). This Hale-type coelostat now feeds an uncooled microbolometer array with digital output at 320x240 pixels, matching the diffraction limit at 17 arc sec (Figure 1).
References
[1] Kaufmann 2013
[2] Kudaka 2015
RHESSI Nugget Date | 15 March 2021 + |
RHESSI Nugget First Author | Guillermo GIMENEZ DE CASTRO + |
RHESSI Nugget Index | 404 + |