March 4, 2019 on 7:08 pm | In Sun | Comments Off

Today’s sun was very interesting.  We have been following the cycle 25 polarized regions on the Sun so far, but this was the first day where we had three cycle 25 polarized areas at the same time.  One in the Northern hemisphere and two in the Southern.  However, none of them did show any sunspots.  Here the composite image of the CaK and HMIB image from SDO.


March 4, 2019 on 5:05 pm | In Sun | Comments Off

The sky cleared up a bit around noon. The Sun is spotless again for spotless day 412 since solar max. and the current spotless streak has now reached 32 spotless days. The two plages visible close to the Eastern limb in the CaK image, and to a lesser extend in Ha,  are polarized as C-25 areas. The close up in Ha is of the small Northern area visible in the CaK image.

2019-03-04-1904_9-TR-540nm.jpg 2019-03-04-1916_9-TR-Ha.jpg 2019-03-04-1912_3-TR-CaK.jpg


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