Search found 1440 matches

by christian viladrich
Wed Jun 29, 2022 4:37 pm
Forum: This is SolarChat !!
Topic: June 27 2022 AR3040 and prom Ha
Replies: 14
Views: 193

Re: June 27 2022 AR3040 and prom Ha

Splendid Leo !
The 9 micron pixel is a perfect match for your setup. Well done !
by christian viladrich
Wed Jun 22, 2022 9:36 pm
Forum: Sunlit Earth
Topic: New Dome Installed
Replies: 10
Views: 121

Re: New Dome Installed

It is beautiful !!
by christian viladrich
Wed Jun 22, 2022 9:56 am
Forum: This is SolarChat !!
Topic: This was a big one! 6/21/2022
Replies: 18
Views: 183

Re: This was a big one! 6/21/2022

Amazing. Well done !
by christian viladrich
Tue Jun 21, 2022 11:36 am
Forum: This is SolarChat !!
Topic: Spencer Observatory Build
Replies: 19
Views: 322

Re: Spencer Observatory Build

Very nice. Thanks for sharing !
by christian viladrich
Tue Jun 21, 2022 8:13 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Measurement of a Quark Ha filter with Sol'Ex spectrometer
Replies: 19
Views: 549

Re: Measurement of a Quark Ha filter with Sol'Ex spectrometer

OK, did a bit of reading and if I am not mistaken, FSR divided by FWHM gives finesse, so this one would have excellent finesse, right? Yes, this is true. But it would have been better to have the same finesse with a smaller FSR, giving a smaller FWHM as a result. I am going a test another Quark. Ju...
by christian viladrich
Tue Jun 21, 2022 8:08 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Measurement of a Quark Ha filter with Sol'Ex spectrometer
Replies: 19
Views: 549

Re: Measurement of a Quark Ha filter with Sol'Ex spectrometer

Very interesting! Is the FSR of 40A in line with other mica filters you have tested? My quark is more like 30A. I was really surprised by the FSR value. Other mica-spaced etalons I measured have a FSR in the range of 18 to 26 A. So, rather close to your 30 A. I used two different approaches to meas...
by christian viladrich
Tue Jun 21, 2022 8:02 am
Forum: This is SolarChat !!
Topic: April 18 flare, and May 10 giant prominence, C8 EDgeHD - double-stack Ha
Replies: 22
Views: 316

Re: April 18 flare, and May 10 giant prominence, C8 EDgeHD - double-stack Ha

Thanks guys ! Pedro, I used the ASI 1600 with binning 2x2, otherwise the "pixel" size is too small. Accordingly, I got 47 fps. This is not very large, but better than nothing in order to have a field large enough. The alternative would have been to use the Basler 1920-155 (at a much larger...
by christian viladrich
Wed Jun 15, 2022 9:28 pm
Forum: This is SolarChat !!
Topic: It's on fire! M-class flare caught on camera (RC8)
Replies: 16
Views: 381

Re: It's on fire! M-class flare caught on camera (RC8)

Well done Filip ! Thanks for sharing.
by christian viladrich
Wed Jun 15, 2022 9:27 pm
Forum: This is SolarChat !!
Topic: April 18 flare, and May 10 giant prominence, C8 EDgeHD - double-stack Ha
Replies: 22
Views: 316

Re: April 18 flare, and May 10 giant prominence, C8 EDgeHD - double-stack Ha

Thanks to all !
So it was an M-class. Good to know.
Great animation Filip. It is quite dramatic in spite of the seeing condition.
by christian viladrich
Wed Jun 15, 2022 9:24 pm
Forum: This is SolarChat !!
Topic: Testing Antlia CaK filter plus one documentary Ha image, 15.6.
Replies: 11
Views: 162

Re: Testing Antlia CaK filter plus one documentary Ha image, 15.6.

This TS Triplet seems to be quite convincing. Your Quark is quite good too.
You're gone have fine when seeing conditions are good !
by christian viladrich
Wed Jun 15, 2022 6:50 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Improved full-disk SHG H-alpha imaging at 700mm FL
Replies: 7
Views: 140

Re: Improved full-disk SHG H-alpha imaging at 700mm FL

Thanks !
Indeed, my concern with the usual M42 focusers we can find in astro (Borg, TS or others), is that they are not strong enough to support the weight of the SHG (in my case Sol'Ex, which is not very heavy, but still ...).
Maybe I have some old macro focusing tubes somewhere.
by christian viladrich
Wed Jun 15, 2022 12:23 pm
Forum: This is SolarChat !!
Topic: AR13030 AR13032 AR13033 in Halpha
Replies: 17
Views: 245

Re: AR13030 AR13032 AR13033 in Halpha

Hello Laura,
This is quite good !
by christian viladrich
Wed Jun 15, 2022 12:21 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Improved full-disk SHG H-alpha imaging at 700mm FL
Replies: 7
Views: 140

Re: Improved full-disk SHG H-alpha imaging at 700mm FL

Hello,
Could you post a picture of the M42 focuser arrangement for the collimating lens ? Currently, I just use a spacer to change focus between Ha and Ca II. Still, it is not very practical.
BTW, the quartz slit is a great idea !
by christian viladrich
Wed Jun 15, 2022 12:16 pm
Forum: This is SolarChat !!
Topic: April 18 flare, and May 10 giant prominence, C8 EDgeHD - double-stack Ha
Replies: 22
Views: 316

April 18 flare, and May 10 giant prominence, C8 EDgeHD - double-stack Ha

Hi, Still processing belated images ... Here are two images of the flare visible on April 18 in the group near to the east limb : http://astrosurf.com/viladrich/astro/soleil/wl/2022/AR2993-4-18April2022-9h31UT-C8EdgeHD-B1920-PE06A-SMN35.jpg http://astrosurf.com/viladrich/astro/soleil/wl/2022/AR2993-...
by christian viladrich
Tue Jun 14, 2022 9:02 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Measurement of a Quark Ha filter with Sol'Ex spectrometer
Replies: 19
Views: 549

Re: Measurement of a Quark Ha filter with Sol'Ex spectrometer

Very interesting! Is the FSR of 40A in line with other mica filters you have tested? My quark is more like 30A. I was really surprised by the FSR value. Other mica-spaced etalons I measured have a FSR in the range of 18 to 26 A. So, rather close to your 30 A. I used two different approaches to meas...
by christian viladrich
Mon Jun 13, 2022 12:18 pm
Forum: This is SolarChat !!
Topic: F30 sweetspot
Replies: 8
Views: 193

Re: F30 sweetspot

Here is the FWHM broadening with f-ratio for a mica-spaced etalon :

http://astrosurf.com/viladrich/astro/in ... spaced.jpg

and for an air-spaced etalon :
http://astrosurf.com/viladrich/astro/in ... spaced.jpg
by christian viladrich
Mon Jun 13, 2022 12:09 pm
Forum: This is SolarChat !!
Topic: SOLAR CYCLE 25 UPDATE
Replies: 24
Views: 437

Re: SOLAR CYCLE 25 UPDATE

Hi Rainer, Sensationalism in order to “popularize” science where facts get distorted doesn’t sound like a good idea to me. I doubt Carl Sagan, Neil deGrasse Tyson, Sir Patrick Moore, Brian Greene, or Bill Nye would engage in such a level of what appears to be deliberate misrepresentation to popular...
by christian viladrich
Mon Jun 13, 2022 12:02 pm
Forum: This is SolarChat !!
Topic: Friday Sun 10th June 2022
Replies: 30
Views: 443

Re: Friday Sun 10th June 2022

Excellent images Stu. The aluminium rail is a great idea.

I've got the same seat :-)
by christian viladrich
Mon Jun 13, 2022 11:54 am
Forum: This is SolarChat !!
Topic: Daystar Quark - Single Stack / Double Stack Comparison 12th June
Replies: 35
Views: 610

Re: Daystar Quark - Single Stack / Double Stack Comparison 12th June

The difference is stricking. Filaments are much dark in DS, and the double limb effet is minimal.
Very illustrative !
by christian viladrich
Mon Jun 13, 2022 11:50 am
Forum: This is SolarChat !!
Topic: 13th June Sunspots
Replies: 10
Views: 166

Re: 13th June Sunspots

It seems that some activity is coming back on the east side.
Thanks for sharing.