Search found 495 matches

by christian viladrich
Sun Apr 21, 2019 7:08 pm
Forum: This is SolarChat !!
Topic: From Monday 15 April - Zooming in on the spot
Replies: 5
Views: 60

Re: From Monday 15 April - Zooming in on the spot

The processing of the second image is quite good.
We were lucky to have this nake eye sunspot.
by christian viladrich
Sun Apr 21, 2019 7:05 pm
Forum: This is SolarChat !!
Topic: 13 April Ca K FD image
Replies: 9
Views: 61

Re: 13 April Ca K FD image

Thanks to all !
The seeing conditions were rather good on that day.
by christian viladrich
Sat Apr 20, 2019 7:29 pm
Forum: This is SolarChat !!
Topic: 13 April Ca K FD image
Replies: 9
Views: 61

13 April Ca K FD image

Here is the FD taken in Ca K on April 13 :
Image
Best regards
Christian
by christian viladrich
Thu Apr 18, 2019 8:39 am
Forum: This is SolarChat !!
Topic: AR2738 in Ca K on April 14 with the TOA 150
Replies: 5
Views: 63

Re: AR2738 in Ca K on April 14 with the TOA 150

Thanks Mark :-)
I am using the Baader Planetarium FFC. It performs beautifully in near UV.
by christian viladrich
Thu Apr 18, 2019 7:57 am
Forum: This is SolarChat !!
Topic: AR2738 in Ca K with TOA 150 and nice details
Replies: 12
Views: 143

Re: AR2738 in Ca K with TOA 150 and nice details

Thanks to all :-) John : my F/D is about 22, so the sampling is about x2.8 the resolving power. Experience shows the optimal sampling is about X3 the resolution power (and not x2 as usually reported). Mark : I am using a blue Astronomik filter which has an excellent transmission in Ca K. The newest ...
by christian viladrich
Thu Apr 18, 2019 7:50 am
Forum: This is SolarChat !!
Topic: AR2738 in Ca K on April 14 with the TOA 150
Replies: 5
Views: 63

AR2738 in Ca K on April 14 with the TOA 150

Here is an image taken on April 14. The light bridge is much reduced compared to the April 13 image. The dark filament spliting the light bridge in two is at the limit of the resolution : http://astrosurf.com/viladrich/astro/soleil/wl/2019/AR2738-14April2019-10h53minUT-TAO-ASI290-CaK.jpg Best regards
by christian viladrich
Mon Apr 15, 2019 7:03 pm
Forum: This is SolarChat !!
Topic: AR12738 - CaH
Replies: 17
Views: 185

Re: AR12738 - CaH

Hello Raf,
The image is quite good. It seems to me that there is a shift in the center wave length ? Or maybe an artefact due to the passing clouds ?
by christian viladrich
Mon Apr 15, 2019 7:01 pm
Forum: This is SolarChat !!
Topic: AR2738 in CaK
Replies: 12
Views: 138

Re: AR2738 in CaK

Hello Bart,
I prefer the one without drizzle. Inverse granulation is lost in the drizzle version.
by christian viladrich
Mon Apr 15, 2019 6:54 pm
Forum: This is SolarChat !!
Topic: When I win the lottery
Replies: 18
Views: 337

Re: When I win the lottery

For an instrument like this, it is strange they didn't use an aspheric singlet. The objective would have been twice lighter. A slight correction regarding "the largest solar teelscope" : - Valery is still having the lead with his C14 as the largest "Ha" amateur telescope ;-) - Regarding white light ...
by christian viladrich
Mon Apr 15, 2019 6:42 pm
Forum: This is SolarChat !!
Topic: Sunday Sun 14th April '19
Replies: 11
Views: 124

Re: Sunday Sun 14th April '19

Hello Stu,
Seeing clearly makes the difference.
by christian viladrich
Mon Apr 15, 2019 6:40 pm
Forum: This is SolarChat !!
Topic: AR2738 from Westport today
Replies: 19
Views: 205

Re: AR2738 from Westport today

Well done Franco !
by christian viladrich
Sat Apr 13, 2019 7:46 pm
Forum: This is SolarChat !!
Topic: AR2738 in Ca K with TOA 150 and nice details
Replies: 12
Views: 143

AR2738 in Ca K with TOA 150 and nice details

The seeing was quite variable this morning. Still, I was lucky enough to get some nice details on this beautiful sunspot. Alight bright seems to be developing. Will see to-morrow what will be next. A very thin dark filament is splitting in two the light bridge. The width of this dark filament is abo...
by christian viladrich
Mon Apr 08, 2019 6:51 pm
Forum: This is SolarChat !!
Topic: Ca K images - March 31 - TOA150
Replies: 6
Views: 138

Re: Ca K images - March 31 - TOA150

Thanks Frank and Valery :-)
by christian viladrich
Mon Apr 08, 2019 6:49 pm
Forum: This is SolarChat !!
Topic: CaK and H-alpha, 07042019, new AR
Replies: 13
Views: 149

Re: CaK and H-alpha, 07042019, new AR

Very nice indeed, Bart !
by christian viladrich
Mon Apr 08, 2019 6:44 pm
Forum: This is SolarChat !!
Topic: AR12738 CaK April 07
Replies: 8
Views: 123

Re: AR12738 CaK April 07

Well done ! There is a clear 3D-effect.
by christian viladrich
Sat Apr 06, 2019 10:42 am
Forum: This is SolarChat !!
Topic: When I win the lottery
Replies: 18
Views: 337

Re: When I win the lottery

Yes indeed :-)
They say it is a 300 mm refractor. I was wondering whether it could be an aspheric single lens, which would make sense.
I would like to test it ;-)
by christian viladrich
Sat Apr 06, 2019 8:43 am
Forum: This is SolarChat !!
Topic: 3_31 CaK (2nd image)
Replies: 5
Views: 106

Re: 3_31 CaK (2nd image)

Indeed, this is a very nice Ca K full disk image.
Well done !
by christian viladrich
Sat Apr 06, 2019 8:37 am
Forum: This is SolarChat !!
Topic: Ca K images - March 31 - TOA150
Replies: 6
Views: 138

Re: Ca K images - March 31 - TOA150

Thanks Mark and Brian :-)
by christian viladrich
Sat Apr 06, 2019 8:37 am
Forum: This is SolarChat !!
Topic: CaK Full Disk & New Active Region 31st March
Replies: 10
Views: 201

Re: CaK Full Disk & New Active Region 31st March

Nice image Mark !
Just wondering at what time did you take it ? It seems the pores were more developed compared to my images taken on the same day. It is amazing how fast these small things evolve.
Christian
by christian viladrich
Sat Apr 06, 2019 8:33 am
Forum: This is SolarChat !!
Topic: Ca K FD on March 22 and 24
Replies: 9
Views: 166

Re: Ca K FD on March 22 and 24

Thanks Maurits, Brian and Alexandra :-)
by christian viladrich
Sat Apr 06, 2019 8:31 am
Forum: Solar Scope Modifications
Topic: 150 mm Solar Newton
Replies: 39
Views: 941

Re: 150 mm Solar Newton

Not sure whether this is relevant information : uncoated primary mirrors (4% reflection) are quite appropriated for G-band (FWHM = 2nm) and K-line (FHWM 8 to 10 nm) imaging.
However, for Ca K imaging (< 0.3 nm FWHM), the exposure time becomes too long.
by christian viladrich
Thu Apr 04, 2019 8:02 pm
Forum: This is SolarChat !!
Topic: Ca K images - March 31 - TOA150
Replies: 6
Views: 138

Ca K images - March 31 - TOA150

Dear All, Here are two images of the small active region visible on March 31 : http://astrosurf.com/viladrich/astro/soleil/FD/2019/CaK-31March2019-9h59minUT-TOA-IDS3370.jpg Though small, this region was nice and very active in Ca K : http://astrosurf.com/viladrich/astro/soleil/wl/2019/CaK-31March201...
by christian viladrich
Mon Apr 01, 2019 6:39 pm
Forum: This is SolarChat !!
Topic: SPICULAES by PROs
Replies: 8
Views: 238

Re: SPICULAES by PROs

Thanks for this Valery,
Indeed, many of the papers based on observations made at the SST are very interesting for amateurs like us.
by christian viladrich
Sun Mar 31, 2019 5:15 pm
Forum: This is SolarChat !!
Topic: New small group and CaH granulation
Replies: 10
Views: 205

Re: New small group and CaH granulation

Hello Raffaello,
This small active region was the nice surprise of this morning.
Nice set of images !