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.
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superiorstream
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Re: Solar cycle 25

Post by superiorstream »

17 feb 2021
Spotless and Featureless sun.
In Ha 0.5A bandwidth
Only small prominence on edge of northern and southern belt with filaments on the belt.
superiorstream
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Re: Solar cycle 25

Post by superiorstream »

The sun..... 22 feb 2021
In 540nm..... Two tiny tiny dotted sunspot just emerged., presumably 2804 visible.
In Cak...... Two bright region emerged in the northern belt., one associated with a dying sunspot and another with a emerging sunspot.
In Ha., 0.5A bandwidth...... Interesting filaments on the northern belt with a fat prominence on the western edge., clearly indicates that the northern belt is increasing in activities. However there is no show on the southern belt.
superiorstream
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Re: Solar cycle 25

Post by superiorstream »

Sun..... ALERT
There is a large inverted u.... the lower U..... shaped prominence at the rotating into view of the southern belt. Easily seen with a Ha 0.5A bandwidth scope.... Do take a look. Thanks.
superiorstream
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Re: Solar cycle 25

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Yes, ht of prominence about 1/3 base width and base width approx 200,000 km. The largest I manage to pick up in this solar cycle.
Next, today's sun.
In 540nm...... Sunspot on both northern and southern belt. On the northern belt, the previous mentioned 2 dot has expanded into a series of spot taking a Z shape if joined together. The main spot core had split up into 3 close together pieces.
The spot on the southern belt is much smaller., but even this small core had split into two.
In Ha 0.5A bandwidth.......... Good show of prominence on both northern and southern belt., with that nice inverted U prominence at southern belt edge. Also 2 bright region in northern belt and 1 bright region in the southern belt. The one in the southern belt is where the sunspot is.
In Cak...... The 3 regions mentioned above show up as bright region again in cak.
superiorstream
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Re: Solar cycle 25

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The above mentioned prominence gone today although a low horizontal spray is detected., but no match to yesterday's view. Here is today's view...... Approx 11am.
In 540nm....... Sunspot 2804 lost its Z shape and become a 2 spot system...... with the smaller spot consist of a bigger spot followed by a smaller spot besides it. The big spot however takes the shape of a comma with a penumbra.
Sunspot 2805,yesterday registered as a doublet small sunspot failed to show up on my scope no matter how I search..... Must be small indeed.
In Cak.... 3 bright region as yesterday., one associated with 2804,one with 2805.,and one more in the northern belt near 2804.
In Ha, 0.5A bandwidth...... As mentioned above 3 bright regions show up with more filaments and prominence associated with the southern belt around 2805. However 2804 turn up to be the brightest of the 3 regions.
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yltansg
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Re: Solar cycle 25

Post by yltansg »

https://1.bp.blogspot.com/-hL6i7CBlJJE/ ... klig.jpg28 Feb, AR 2804 has been active this week. It ejected a C3.9 flare at about 2:40pm today. The western limb where it is at looked like this at 11 am in Calcium-k wavelength (lower chromosphere of the Sun):

Image

In Hydrogen-Alpha:
Image

We can see the build-up for the flare.

Alfred
superiorstream
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Re: Solar cycle 25

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Thanks Alfred for the nice photo..... and yes saw that too. 3 active regions on that day.
Now for the action today.
In 540nm...... Blank sun.
In Cak.... One bright small region in the southern belt plus one bright dot near the south pole.
In Ha, 0.5A bandwidth...... Besides the above mentioned region shows up, several filaments and small prominence show up.
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yltansg
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Re: Solar cycle 25

Post by yltansg »

14Mar21. Used an 11 inch telescope for an in-depth look at the active region AR 2808 in Hydrogen Alpha wavelength. Saw dark fibrils, filaments and plage surrounding the AR, illuminated by light by Hydrogen atoms in the Sun's upper atmosphere.

This image from NSO, Australia shows the location of the active region on the solar disk:
Image

This is the image I took with a Celestron 11" SCT:
Image

This active region harbours energy for C-class flares. Do keep watching it.

Enjoy.

Alfred
superiorstream
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Re: Solar cycle 25

Post by superiorstream »

Thanks Alfred for the nice photos.
The one on top is actually should be a Ha one.
In Ha 0.5A bandwidth...... Today that one on the northern belt becomes one with the shape like a hen leg followed by a filament. Also there are two bright regions in the southern belt., and a small filament.
At the edge of the northern belt there is a fat short prominence....... Its a trend that now prominence are bigger and taller these days.
Due to clouds, don't have a chance to obs in Cak and 540nm.
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yltansg
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Re: Solar cycle 25

Post by yltansg »

superiorstream wrote: Wed Mar 17, 2021 12:53 am
In Ha 0.5A bandwidth...... Today that one on the northern belt becomes one with the shape like a hen leg followed by a filament. Also there are two bright regions in the southern belt., and a small filament.
At the edge of the northern belt there is a fat short prominence....... Its a trend that now prominence are bigger and taller these days.
Due to clouds, don't have a chance to obs in Cak and 540nm.
Thanks for sharing your observation. I hope other members would also chip in to add more ideas to this thread.

Alfred
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