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2021 May 20

The Sun during the M-Class Flare

Full disk image of the Sun showing the location of the M-class flare. Click for movie!

Another M-class flare from the E-limb!

On the 7th of May, XRT observed a M3.9 flare from the active region located on the East limb of the Sun (see the above image and click for the movie). This is the 4th M-class flare since the official start of Solar Cycle 25 in December 2019, and the 2nd biggest so far next to the M4.4 flare from last November.

Date Begin Max End X-ray Loc Region
29-MAY-2020 07:13 07:24 07:28 M1.1
29-NOV-2020 12:34 13:11 13:41 M4.4
19-APR-2021 23:19 23:42 23:59 M1.1 S24E25 2816
7-MAY-2021 18:43 19:04 19:19 M3.9 2822

The expanding and errupting loop is captured with the thin filter images (left-hand side of the movie) from 18:56UT, while the growth of the center part of the flare is well observed with the thicker filter images (right-hand side) that were started to work after XRT triggered the flare-mode on 18:53:04.

It is interesting that 3 out of 4 M-class flares in the Solar Cycle 25 (excpet the one in April 2021) were observed from the East Limb. Click here for a bonus full disk movie of this flare!

Keywords: Flare, Limb
Filters: Al_Poly, Med-Be

(Prepared by Keiji Yoshimura and Aki Takeda)

The XRT instrument team is comprised of SAO, NASA, JAXA, and NAOJ.

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