Solar diary

2021 July 6 to 25

July is my month for vacations so my imaging activity reduced accordingly. I continued to observe the Sun in WL and H-alpha making my usual drawings and sunspot counts for the AAVSO. Sunspot activity continued through all month of July although at a modest level, no major groups appeared, no one evolved beyond class C.... Continue Reading →

2021 June 29 – 30

Images of 29 show a large, magnetically disturbed area in the northern hemisphere. In H alpha it appears as an envelope of spicules, plages and filaments, in calcium light is a fragmented bright area without sunspots although a couple of pores have been observed inside on day 28. AR12835 is still prominent as the penumbra... Continue Reading →

2021 June 28

The small B-group just south of AR12835 received an official designation, AR12836. It is still of class B but is evolving and this morning was composed by ten spots without penumbras. AR12835 seems quite stable compared to yesterday while another group emerged from the NE limb, a single spot with penumbra, maybe of class A.

2021 June 27

AR12835 evolved little since yesterday, it's still a D-class bipolar group with s-value preceding and following main spots. Few very small spots and pores can be seen between them. South of this group another one emerged yesterday from a bright facular/plage area, a B-class group with very few spots. From the E limb more active... Continue Reading →

2021 June 25 & 26

These last two days changed everything from the flatness of the past week. AR12835 emerged from the SE limb on day 25 as a D-class group composed by 8 spots with the leader and the follower both surrounded by well defined penumbras. The group produced only minor flares but higher activity cannot be ruled out... Continue Reading →

2021 June 24

Large magnetically active regions emerged in the past 48h from the east limb of the Sun, both on the N and the S hemisphere. None of these have sunspots, their appearance is of irregular facular zones in white light and as bright chromospheric plages. Several quiescent proms could be detected around the limb, particularly in... Continue Reading →

2021 June 18 to 21

Still no news compared to my previuos report. Based on STEREO A probe imagery it seems that the most interesting things as CME's are occurring on the farside while activity on the nearside of our Sun shows no significant variations. AR12833 is turning toward the W limb still as a H-class group. Images in Calcium... Continue Reading →

2021 June 14 & 16

No significant news from the last report, there is only one group visible, AR12833, a well rounded H-class single spot in the N hemisphere. H alpha activity continues in the form of filaments and proms, mostly quiescent and sometimes very beautiful. Several plages can be observed but none of them linked to sunspot activity.

2021 June 10 to 13

Solar activity resumed a little with the appearance of a new northern group, AR12833, a single (for now) spot with a large symmetric penumbra. Few pores can be seen here and there on a mostly blank disc. A large facular area that emerged four days ago didn't produce any spot, not even a pore. H-alpha... Continue Reading →

2021 June 6 to 9

AR12827 is now beyond the W limb together with few groups that emerged and suddenly vanished or rotated out of view. Taking into account of these, the AR numbering reached 12832 with the small A group that is transiting the meridian on day 10. Few days ago STEREO images showed one or two promising active... Continue Reading →

2021 June 03 & 04

No news since my last report. AR12827 did change very little, the leader spot is still composed by a well developed penumbra with a single umbra inside. In its trail one can see a spot with rudimentary penumbra and very few pores . AR12829 now has a well defined penumbra with two separate nuclei inside,... Continue Reading →

2021 May 30 & June 1

No significant evolution of the solar activity occurred in this last two days. AR12827 remains of class C but it further developed in longitude and still counts 9 spots including the main one. NASA STEREO images show that further activity is expected to rotate into view this week, however this morning only a bright patch... Continue Reading →

2021 May 30

AR12824 & 12826 have now rotated beyond the W limb but on the photospheric disc two new groups emerged in the last 24h. AR12827 in the N is a modest (at least for now) B-class group composed by nine small spots with a clear bi-polar structure. The L spot seems developing a rudimentary penumbra. In... Continue Reading →

2021 May 26

There are now two major sunspot groups, AR12824 and AR12826. The former seems again declining, classified as class C (after having already passed through H class stage) still shows a well developed main spot with several minors around. AR12826 emerged few days ago and is now a very interesting complex C-class spot with no clear... Continue Reading →

2021 May 23

AR12824 produced another M-class flare on May 23 plus few minor ones. The spot is quite interesting to observe although certainly not a major group. Seeing was bad today, however not so bad to prevent taking some pictures. The full H-alpha disc below shows the decaying stage of a C-class flare that just preceded the... Continue Reading →

2021 May 18 to 21

Departing AR12822 left AR12824 alone on the solar disk until day 22 when a new sunspot group emerged from the NE limb (Courtesy of NASA/SDO and the AIA, EVE, and HMI science teams, modified by the Author of this website) AR12824 is now of class H, those few spots that were surrounding it have almost... Continue Reading →

2021 May 17 – 18

While AR12822 is departing beyond the NW limb, AR12824 has just appeared on the opposite side. For now it seems a C-class group with a well developed leader spot, however is still too close to the limb for revealing any following features. Activity in H-alpha is limited, the only remarkable feature is a quiescent flame... Continue Reading →

2021 May 9 to 15

During the second week of May solar activity in white light was limited to a couple of modest susnpot groups, AR12822 & 12823. The first was composed by a large spot surrounded by minor ones. Solarmonitor.org reports it as of class D at the largest stage of evolution, for me it never went beyond Zurich... Continue Reading →

2021 May 2 to 7

Our Sun remained spotless between the end of April and May 6. On May 7 a new group rotated into view from the NE limb. As I am writing this post the group seems composed by a large spot with penumbra preceded by two smaller ones. If the large spot is the leader of the... Continue Reading →

2021 April 24 & 25

South of AR12818 - a J-class groups that still doesn't show any intention to develop beyond this stage - is now AR12820, a scattered D-class group with an irregular penumbra around the main spot accompanied by several small dark spots and pores (I counted 16 of the them this morning around 0730 UT). AR12816 is... Continue Reading →

2021 April 16 to 23

Solar activity resumed again following the appearance of active regions 12814 to 12818. Signs that cycle 25 is finally ramping up were visible on day 16 when the H-alpha disc showed several bright plages, filaments and proms Image of the disc on day 16. The bright plage on the lower right part of the disc... Continue Reading →

2021 April 6 to 14

April began with the usual H alpha activity but no spots. Several beautiful proms were seen along the limb however in WL the surface remained almost spotless for several days, even in Ca-K there were only few features to be imaged. Finally on day 13, active region 12814 emerged in the southern hemisphere as a... Continue Reading →

2020 March 20 to 30

AR12811 & 128212 have been the last notable active regions of 25th cycle to appear on the Sun in March. Both vanished at the end of the month having reached class C and H (J) respectively. Although disappointing in white light, in H-alpha they were fine objects to observe. A good image I have been... Continue Reading →

2021 March 12 to 19

Only few minor active regions developed in the last two weeks, small sunspot groups never larger than class C and modest plage areas. AR12808 was another group that marked the return of solar activity in the N hemisphere after some months of quiescence. It never went beyond class H. AR12809 in the southern hemisphere @-21°... Continue Reading →

2021 March 7 to 10

Solar activity is still at low levels although (finally!) far from solar minimum conditions. The appearance of small sunspot groups is becoming more frequent in both the northern and southern hemisphere. Most of them don't go beyond class B, nevertheless this is a very welcomed sign that cycle 25 is warming up. After the departure... Continue Reading →

2021 March 2 to 5

Solar activity is still at low level. AR 12806 & 12807 in the southern hemisphere started as B-class groups, sparse clusters of very small spots and pores. On day 5 almost nothing remained of both in white light but a couple of minor bight plages is visible in H alpha at their location. Several prominences... Continue Reading →

2021 February 23 to 26

Solar activity resumed again in the last week of the month. Northern AR12804 & southern 12805 were both B/C-class groups that appeared between days 20 and 21 close to the central meridian. AR12804 developed further and on day 26 is classified as being of D class. The leader spot is now surrounded by a well... Continue Reading →

2021 February 14 to 21

Solar activity is still low, there are no major active regions on the disc and none is expected to emerge in the next days. AR12803 is a very minor A-class group in the northern hemisphere composed of two small spots none with penumbra. Observing in H alpha light, however, reveal a different Sun showing several... Continue Reading →

2021 January 26 to February 11

Solar activity remained low in the past two weeks. Few pores and spots appeared in both the northern and southern hemisphere but all of them vanished in a few days without developing to a mature stage. While for most of January the H alpha disc showed several filaments and proms, toward the end of the... Continue Reading →

2021 January 12 to 25

After several spotless days the Sun in now active again. The most developed group is AR12797 that emerged from the east limb on day 17. Initially classified as a C group due to the presence of a small cluster of spots in following position, it is now labeled as H because that cluster actually belongs... Continue Reading →

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