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New active region, Sun April 7th.

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#1 Aquarellia

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Posted 07 April 2019 - 07:25 AM

A new and possibly large sunspot is just emerging at the solar limb.

 

5B70E100-0220-41B6-B04F-2B061F41D3FA.jpeg

Credit: SDO/HMI

 

I sketch the right part of this image with my Bresser 102/1000 mm refractor.

In H alpha the view was not really clear through my 35mm Lunt.

 

The contrast of this spot is uncredible, usually a spot near the limb is never easy to see, today the view of this group of spot was really clear.  And on top of that my sketch was done through a bad cloudy layer. 

Clear sky to you all.

Michel


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#2 Uwe Pilz

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Posted 07 April 2019 - 08:16 AM

I saw it first this morning in Ha. Here is a sketch with my 4 inch refractor at 53x, mirror reversed.

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#3 Uwe Pilz

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Posted 07 April 2019 - 08:21 AM

... and the Ha sketch form this morning, with PST@40x. The first sketch with silverpoint made at the scope (and not at the desk).

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#4 Aquarellia

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Posted 07 April 2019 - 08:29 AM

Super Uwe, in H alpha !!! Here it was impossible because of the bad cloud layer we have.

Look at the cirrostratus I had up to my pifgin tower :

 cyrostratus.jpg

Ok sorry, Don't blame me it's not a sketch… 

Michel


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#5 Special Ed

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Posted 07 April 2019 - 12:34 PM

Michel and Uwe, nice sketch work!  Looks like this active region will be a good one to follow.

 

Uwe, looks like you had a great view with your refurbished PST.  My new ITF filter is in the mail and I hope to get my PST fixed up in time to see this new AR--it's cloudy and rainy here now but supposed to be sunny here by Wednesday.

 

Michel, nice pic of that arc. smile.gif 


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#6 niteskystargazer

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Posted 07 April 2019 - 02:28 PM

Michel,

 

Nice sketches  New active region, Sun (On April 7th) cool.gif .

 

CS.KLU.

 

thanx.gif ,

 

Tom



#7 frank5817

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Posted 07 April 2019 - 06:51 PM

Michel,

 

Great sketch.

I've got to go out and see this.

 

I went out and looked. First sunspot I have seen this year.

 

Frank smile.gif



#8 Jef De Wit

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Posted 08 April 2019 - 03:41 AM

In my opinion the new sunspot arrived one day too late. I wanted to celebrate my 2000th Wolfnumber with a sketch, but on 6th of April there were no sunspots. And look one day later...


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#9 Aquarellia

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Posted 08 April 2019 - 04:04 AM

In my opinion the new sunspot arrived one day too late. I wanted to celebrate my 2000th Wolfnumber with a sketch, but on 6th of April there were no sunspots. And look one day later...

Ok, you have to call NASA, maybe they can make something to redo the Sun's rotation ? lol.gif 

Whaw, 2000 Wolf numbers, did you post them in AAVSO or SILSO ?

 

Since february 2018 I had 335 days with WolfNumbers,... only... 

 

Michel


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#10 Uwe Pilz

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Posted 08 April 2019 - 02:15 PM

Many faculae around the spot! 

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#11 Aquarellia

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Posted 08 April 2019 - 02:47 PM

Many faculae around the spot! 

Indeed Uwe, you did really a nice sketch there!  Good job!

This is a typical spot isn't it ? 

Michel



#12 Special Ed

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Posted 08 April 2019 - 04:43 PM

Nice, Uwe!  The AR has lots of B-class flare activity--maybe that is associated with the faculae.

 

It looks typical, Michel--just bigger than what we've been seeing.  It is still part of Solar Cycle 24



#13 frank5817

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Posted 08 April 2019 - 10:53 PM

Uwe,

 

Very fine sketch of all that detail .

Nice work.

 

Frank :)



#14 Special Ed

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Posted 09 April 2019 - 10:03 AM

Many faculae around the spot! 

Here is an image in the Solar Observing forum showing all the faculae.  Scroll down for the WL images.


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#15 Aquarellia

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Posted 09 April 2019 - 10:34 AM

Here the one of today, 

 

 sun20190409-c_l.jpg

 

Clear sky 

Michel


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#16 Jef De Wit

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Posted 09 April 2019 - 10:40 AM

Whaw, 2000 Wolf numbers, did you post them in AAVSO or SILSO ?

I send by observations every month to the solar section of the astronomical society of Belgium.



#17 Uwe Pilz

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Posted 09 April 2019 - 12:04 PM

Detail are easier detect form day to day now. The spot has light bridges! (Is that the correct english term?)

 

4 inch refractor at 53x, mirror reversed.

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#18 Aquarellia

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Posted 09 April 2019 - 11:33 PM

Indeed Uwe, it's more and more easy to see details now. Our two shapes are very similar.

For the proportion and the relative position to the limb I used the two eyes open method, one to the paper and the other one through the EP.

Michel



#19 NorthernlatAK

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Posted 10 April 2019 - 02:00 AM

Awesome at the scope sketches!! I made my very first sketch today but only have a phone so it won't let me reduce the size. I used an 8" f5.9 dob with a homemade baader film filter. Seeing was varying in 1 minute cycles with very fine structure revealed during good moments. The faculae appeared as fine gray hairs radiating from the spot. I saw the light bridges as well seemingly making the spot appear to have three sectors. This was my first spot like this since I've gotten my solar film and am happy to have intermittent good seeing to see the very fine detail. I used a 25mm plossl with the gso 2.5× 3 element barlow (really about 2.1×) for ~100× to get the most detailed view. Hopefully I'll be able to post this pic here soon.
Btw, what are those "light bridges" that are in your sketch? (Also in mine)

Edited by NorthernlatAK, 10 April 2019 - 02:02 AM.

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#20 Aquarellia

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Posted 10 April 2019 - 05:49 AM

Thank you North.

I suspect those light bridge as described   by Uwe as Ellerman bombs, when I draw this area the bridges were not as brilliant.  

This time of the solar cycle looks ideal for such bombs.

 

Here the explanation:

 

3B5A4309-73CC-4DB5-82AE-9978B70DF522.jpeg

 

Often this sort of bomb has not a very long effect anyway maybe both of you saw this event?

Michel.


Edited by Aquarellia, 10 April 2019 - 05:50 AM.

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#21 NorthernlatAK

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Posted 10 April 2019 - 01:04 PM

I saw it for several hours, it was there in the morning and when I checked again in afternoon. I saw it the day before as well but not as clearly. This was in white light.

#22 NorthernlatAK

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Posted 10 April 2019 - 01:39 PM

I just looked this morning and there's still a bridge crossing the spot. Long lasting phenomena... not an ellerman bomb? The spot is in two sectors now instead of three. I will continue to monitor as long as weather permits this afternoon. Seems a little smaller today.

Edited by NorthernlatAK, 10 April 2019 - 01:41 PM.


#23 NorthernlatAK

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Posted 10 April 2019 - 02:04 PM

As seeing steadied I caught glimpse of the second "bridge". It's much closer to the other "bridge" and thinner. The whole spot seems to be shrinking, at least the middle "sector". I sure wish I could post my sketches.

#24 Special Ed

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Posted 10 April 2019 - 02:13 PM

I made this observation and close up sketch about 11:00 am local time.  I tried to use 167x but the seeing would not support that magnification.  I could not see any faculae but that might have been due to a combination of seeing conditions and the fact that the AR has rotated in a good ways from the limb now.

 

Like AK above, I saw the umbra in two parts separated by what looks like a light bridge to me.  Light bridges are often an indication of instability so maybe the spot is decaying already?  Or maybe getting ready to flare?

 

The seeing wasn't good enough to see more than just hints of filamentary structure in the penumbra.  The AR was followed by 2 small pores.  I thought I saw 3 when I first began studying the AR but then one disappeared.  Or maybe it was the seeing.

 

Sketch was done at the eyepiece with 2B, HB, and 9B pencils and a stump on Strathmore medium paper.  The sketch was flipped digitally to give the correct image view.

 

AR2738_2019.04.10.v1.jpg


Edited by Special Ed, 10 April 2019 - 02:16 PM.

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#25 NorthernlatAK

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Posted 10 April 2019 - 03:17 PM

Can anyone explain what these "bridges" are? I'm seeing a very thin one close to the main bridge also crossing but much thinner. Looks like a hair.


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