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2019 November 07

XRT observes the first Cycle 25 region.
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A Cycle 25 Active Region Making its Passage

In this early November 2019, we are observing a tiny active region in the Southern hemisphere. It popped up at high latitude (28 degree) and is preceded by negative polarity (see right-most set of images). This indicates that this active region belongs to a new solar cycle (the Cycle 25)!

Actually, it is not the first one of the new cycle. We had a similar region in early July (middle image set). I checked with the NOAA active region summary report and picked up below the active regions appeared at higher than 25 degrees of lattitude for the period 1-Jan-2018 to the present.


From the left-most magnetic field image in the above, the active region in January 2018 turns out to have the polarity of the old cycle. This confirmed that the target region in this week is the second one (numbered active region) from the Solar Cycle No.25.

Keywords: Solar Cycle, Synoptic, Full Disk, AR Tracking
Filters: Al_poly

(Prepared by Aki Takeda)

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

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