Solar cycle 25

Alright, this is for sharing of your observation experience. Or, if you are arranging gatherings, star-gazing expeditions or just want some company to go observing together, you can shout it out here.
Post Reply
User avatar
yltansg
Posts: 388
Joined: Mon Aug 31, 2009 3:35 pm
Favourite scope: Borg 76 + Solar Scope SF50
Location: Bukit Batok

Re: Solar cycle 25

Post by yltansg »

Dear Mr Chia and solar enthusiasts,

I managed to take some videos using a C11 SCT in H-Alpha and Calcium-K wavelengths and made stills from them. First, from Spaceweather, the survey of the solar disk.
Image

The Active Region 2816, nearer to the western limb in H-Alpha:
Image

Then the Active Region 2818 in H-Alph:
Image

And AR2818 in Calcium-K wavelength:
Image

The images are best viewed on a desktop computer. Please do a right click to see the images in their full resolution.

Alfred
superiorstream
Posts: 1275
Joined: Mon Nov 03, 2008 4:45 pm

Re: Solar cycle 25

Post by superiorstream »

Hi Alfred
Pretty nice closeup.
Thanks and look forward to looking at such closeup in 2024/5 when solar activity peaks.
User avatar
yltansg
Posts: 388
Joined: Mon Aug 31, 2009 3:35 pm
Favourite scope: Borg 76 + Solar Scope SF50
Location: Bukit Batok

Re: Solar cycle 25

Post by yltansg »

Solar enthusiasts, today was a good day for observing the active regions near the western limbs:

Image

These sunspots have ejected many flares last weekend and on the first 2 days of this week.

The seeing was fairly good and super granulations were clearly observed too:
Image

As usual, please do a right click to see the images in full resolution.

Alfred
User avatar
yltansg
Posts: 388
Joined: Mon Aug 31, 2009 3:35 pm
Favourite scope: Borg 76 + Solar Scope SF50
Location: Bukit Batok

Re: Solar cycle 25

Post by yltansg »

Mr Chia and solar enthusiasts,

As many celebrate Mother's Day (9May) today, Sunspot AR2822 continued its flaring campaign. I caught this image of it at 9am this morning as it was getting ready to flare. The flare went off at about 1 pm, a C1.5 class flare. Just by looking at the image, you can see how a pre-flare sunspot looks like. The red light emitted by hydrogen atoms revealed fiery-looking filaments and fibrils in the Sun's upper atmosphere,which are indication of the intense energy the active region is harbouring.

Image

In the extreme violet wavelength, light from calcium atoms showed the happenings in the lower atmosphere.

Image

As a reference, from Spaceweather.com, the active region can be seen at 10 o'clock position:

Image

More images later.

I would love to hear your comments.

Alfred
superiorstream
Posts: 1275
Joined: Mon Nov 03, 2008 4:45 pm

Re: Solar cycle 25

Post by superiorstream »

Hi Alfred
Nice photos with such close up.
On the other hand, if you are viewing using a Ha 40mm double stack, it turns out that those regions undergoing flare usually are much brighter than those general sunspot region. This will also be true for the Cak view. (with my lunt filter).
Now for 10 may 2021 sun.....
In 540nm...... Sunspot 2822 at the northern belt just show up as 2 spots., one , a spot with a penumbra and the other a comma shaped spot with a wider penumbra.
Sunspot 2823??,not yet name by space weather., a tiny sunspot in the southern belt that also just come into view.
In Cak..... The above 2 regions show up as 2 small bright regions. Also, a third bright region show up, somewhere near the middle of the southern belt.
In Ha, 0.5A bandwidth....... The above 3 regions show up again as bright regions, with 2822 and 2823 being brighter.A nice prominence also show up at the edge and a short filament show up at the northern belt.

It must be noted that so far, all the sunspots are much smaller than those in the last solar cycle.
johnnn943
Posts: 4
Joined: Wed May 12, 2021 4:30 pm
Favourite scope: Celestron 21037 PowerSeeker 70EQ

Re: Solar cycle 25

Post by johnnn943 »

The duration of the solar cycle is not constant. On average, it lasts about 11 years. But there were cases when the duration of the cycles was 7 and 17 years.
User avatar
yltansg
Posts: 388
Joined: Mon Aug 31, 2009 3:35 pm
Favourite scope: Borg 76 + Solar Scope SF50
Location: Bukit Batok

Re: Solar cycle 25

Post by yltansg »

23May - Active Region continues to eject flares. Photographed it with a C11 fitted with D-ERF in H-Alpha wavelength, the upper chromosphere which is lighted up by red light from ionised Hydrogen atoms:

Image

Enjoy it.

Alfred
User avatar
yltansg
Posts: 388
Joined: Mon Aug 31, 2009 3:35 pm
Favourite scope: Borg 76 + Solar Scope SF50
Location: Bukit Batok

Re: Solar cycle 25

Post by yltansg »

Compared to yesterday (23May21), the seeing was poorer today (24May21). This is evident from the level of fine details in the images taken on these 2 days. You can tell which image was taken today:

Image

AR2824 has unleashed 10 C-Class and 2 M-Class flares over a 24 hr duration, something we have not seen for some time:

Image

As usual, do a right-click to see the images in their full resolution.

Alfred
superiorstream
Posts: 1275
Joined: Mon Nov 03, 2008 4:45 pm

Re: Solar cycle 25

Post by superiorstream »

Hi Alfred
Nice, high resolution lphotos. Wonder if its possible to turn it into life view with the same resolution..... If so its really research grade.
Last edited by superiorstream on Tue May 25, 2021 8:05 pm, edited 2 times in total.
superiorstream
Posts: 1275
Joined: Mon Nov 03, 2008 4:45 pm

Re: Solar cycle 25

Post by superiorstream »

The sun today
In 540nm......
2824 turn up as a single larger spot coupled by a much smaller spot., this system surrounded by a semi circle of small spots. Also at about 300,000km away from this spot lies a doublelet sunspot(not named yet).
Then at 2825 position, i didn't see any spot 2825.
In Cak..... Yes, 2825 showed up as a bright spot and 2824 show up as a elongated bright region with a big single spot with a penumbra. That doublelet associated with 2824 also show up as a bright region.
In Ha 0.5A bandwidth.....
Whats mentioned above in cak and 540nm all show up as bright region associated with filaments. Of special interests is 2824.... It show up as2 big spots., both with bright region taking the shape of a comma.
Also worth mentioning is a prominence in the form of several S shoting above the sun at the southern belt edge...... One of the highest i see in this cycle.
Post Reply