SolarChat!

christian viladrich

This should work for the zwo version: https://www.zwoastro.com/downloads/developers download the SDK -From the lib folder in the unzipped SDK open the x64 folder -from there take the "ASICamera2.dll" and place it into the firecapture folder (safe the old file in the firecapture folder) -C...

christian viladrich

Ok, I see. Probably the iradiance (ASTM) is more usefull for this. This is the data I used to calculate the amount of energy transmitted by various ERF configurations. On the other hand, in order to calculate the contrast (or selectivity) of a SS, DS, TS combination, I used the BAS2000 solar spectru...

christian viladrich

For solar irradiance, it might be better to use this :
https://www.nrel.gov/grid/solar-resource/spectra.html

It is given for sea-level (1.5 airmass), and also on top of Earth atmosphere.
This is the source for the graph you gave.

But it all depends on what you need exactly.

christian viladrich

Thanks of your views guys. Sometimes changing the USB cable helps. I have a quality USB3 cable with which all cameras work at maximum FPS, except IMX533. With another cable it works at 44 FPS as it should. High-speed USB is sometimes alchemy. Storage speed also plays a role. If I want the maximum, I...

christian viladrich

I have the ASI462 MC and I can get a steady 128fps in firecapture 2.7 (usb traffic is set to 96) so the MM should have the same sort of performance. If I switch off high speed mode it drops to 77fps so maybe it is a driver issue ? This could be a driver issue. The camera is "new" in the s...

christian viladrich

KMH wrote: ↑Mon Jun 05, 2023 6:31 pm You didn't mention it but I assume you must have experimented with bit depth? Both my 462MM and MC only get the high frame rate in 8-bit mode.

Kevin

Yes, it was in 8-bit mode.

christian viladrich

marktownley wrote: ↑Fri Jun 02, 2023 7:28 am These are excellent Christian!

I think my favourite are the last three where the double stack filter starts to show some of the depth (or height?) of features in the lower chromosphere.

Thanks Mark,
There is definitely something like this.

christian viladrich

Excellent!! I'm fun of your Ca hires images, Christian! :) It's curious to see how more chromosphere details appears in Ca DS setup like filaments, fibrils in the most magnetically disturbed places. Your spicula forest on the limb came out nice. Leo Sure. Double-stacking allows to sample a higher l...

christian viladrich

Dennis wrote: ↑Sat Jun 03, 2023 9:26 pm Congrats to the first light Ha images! Aperture rules.

A 290mm Baader D-ERF, thats interesting. Nice that they made it.

Indeed, it was very difficult to get one. I understand they are very difficult to make.

christian viladrich

Thanks to all ! How long does Mewlon temper and what is the temperature stability when working in the sun? Is the setting stable or does it require frequent refocusing? This was indeed a possible issue. I also use the Mewlon 250 for Venus observation in the late afternoon. In that situation, I have ...

christian viladrich

Hi all, I have an issue with my all new ASI462 MM camera. This is the lasted model wth the DDR2 memory. It is supposed to go up to 136 fps, but I can't go beyond 73 fps. I tried with the last version of Firecapture and ASICAP. It makes no difference. I have the latest versions of drivers. The PC is ...

christian viladrich

Hi, Here is the first Ha light image of the Mewlon 250. Everything is not finely tuned yet. The electric focusing controling the secondary miror is a nightmare. If anyone knows how to change the original DC motor for a stepper moteur, this would be great ! In any case, the resolution improves compar...

christian viladrich

Thanks guys :-)

christian viladrich

Thanks to all !

Stu, sometime I prefer the OIII, other I prefer the G-band ;-)
The G-band has the edge for granulation and faculae details. The OIII is very nice for umbral dots and light bridges.

christian viladrich

Same questions as our two friends ;-)
- What is your exposure time ?
- How many frames do you stack ?
- Are you using a color filter in addition to the Astrosolar ND3.8 ?

In any case, the solar wedge would be a huge step forward.

christian viladrich

Hi, The Mewlon 250 is not the instrument that one thinks of spontaneously for solar observation. However, for high resolution, the field is large enough to cover the usual sensors. The optical performance with the Airylab telecentric is very good. Collimation stability is very good. And the Astrosol...

christian viladrich

Very nice Ivan. Processing is splendid.
The structure of the big filament is quite intricate. For some reasons, I could see it on the computer screen with the Ca K 0.37 nm filter, but not with the Ca K 1 nm filter.

christian viladrich

Yes, great thread. Just to point out that the PST came later. Coronado started with the AS series (e.g., 90 and 60mm) in the late nineties and perhaps earlier models. They were kind of affordable. The ASP-60 was $2650 in 2000. My astro buddy still has our two (we each bought one and took turns doub...

christian viladrich

Splendid. Very well done.

christian viladrich

Splendid. Very well done.

christian viladrich

I've just found Mark Wagner post about the works of Doug Martin at Spectrolab. Mark is the owner and maker of Solar Spectrum filters : "Making Mica etalons commericaly goes back to Spectrolab. Del was hired to run a coating machine there by Doug Martin. After that he went with Carson Industries...

christian viladrich

Interesting ...a bit earlier : - in 1959, J.A. Dobrowolski (Canadia) wrote : "Mica interference filters with transmission bans of very narrow Half-Widths, Journal of the optical society of canada, August 1959", describing the making, properties and possible uses of mica-spaced etalons, - I...

christian viladrich

Hi, Here is a Ca K image taken on May 29 : http://astrosurf.com/viladrich/astro/soleil/FD/2023/2023-05-29-0801-ChrVld-TOA150-ASI1600-CaK-Alluxa037nm.jpg During acquisition, I could see a faint filament on the east. Comparison with the Bas2000 image confirmed it : http://astrosurf.com/viladrich/astro...

christian viladrich · Re: The graph tells the story 1 June 2023 Nice set of images !

Nice set of images !

christian viladrich

Great shot and excellent visual observation report !

christian viladrich

It depends what you means by Ha solar telescope.

DayStar filters were available to the amateurs a long time ago (before 1976 for sure).

christian viladrich

Fantastic animation !

I was wondering if you could slow it down a little bit, so that we can follow more easyly the motions of granules ?
If you can, try a version showing the motion of the umbral dots (= within the umbra of the spots). Just increase the brightness of the images.

christian viladrich

Awesome Paul !!!

christian viladrich

Awesome Paul !!!

christian viladrich · Re: May 26 2023 Ca K closeups SS and DS Very well done Leo !!

Very well done Leo !!

christian viladrich

Great tests, thanks, Christian! breathtaking closeups... it would be very intriguing to obtain SHG images in Ca at the same scale. Is it really not easy to adjust such an exclusive pair of filters by both rotation and tilting? Leo Sure. One day, I have to use my "high spectral resolution"...

christian viladrich

Testing and measuring narrow band filters is feasible. It requires some care, and an adequate SHG.

You can see here an example of an excellent Quark and a very bad one :

http://astrosurf.com/viladrich/astro/in ... lters.html

christian viladrich

It seems everything is ready for better seeing conditions !

christian viladrich

Superb FD images Arne ! Very well processed.

christian viladrich

Nice set of images Sergio !

christian viladrich

Thanks :) Christian, I bought it from Omega optical about 10-12 years ago, it was one of the first filters I bought. To know the details of it would require me to be a lot more organised than I am. It may take a big search to find the order sheet with the spectra on it :) Alexandra Don't bother wit...

christian viladrich

Marvellous collection Stu !

christian viladrich

I must say that even though the Antlia gives similar views to the G Band filter, the fact that I don't need to stop down the TEC140 to 100mm and can use it at full aperture when using the G-Band filter, means it is the clear winner for me. Vineyard, these filters are WL filters and can't be compare...

christian viladrich

Thanks everyone for all the kind words, I enjoyed testing and comparing these filters. I did notice that my TiO filter was clouded over and degraded and I couldn't get focus :( another solar filter bites the dust! one in, one out. Alexandra BTW, what is the bandpass of the TiO filter ? Where did yo...

christian viladrich

Hi all, After several months of bad weather, the Sun finally made its return on the morning of the 22nd, and the seeing was not bad :) It was an opportunity to compare the G-band Altair filter which was just released (430.3 nm FWHM = 2 nm) to the Antlia 393-3 nm which was released last year. These t...

christian viladrich

Thanks for sharing Alexandra - looks very interesting. I'm looking forward to seeing some comparison shots between the G-band and CaK or CaH to see whether there is a huge difference between them or not. Cheers! So, keep tuned :tomorrow, I'll post a comparison between Antlia 393-3 nm, Altair G-band...

christian viladrich

Hi Dennis, Quantum efficiency is about photons and photoelectrons : number of photoelectrons creates in the photosite/ number of photons received by the photosite QE of 50% means that for 100 photons received by the photosite, 50 electrons are created in the photosite. Relative response is about ene...

christian viladrich

I couldn't gather from the post, did you use it visually? Could you discern a difference between it and the baader visually ? Hi Bojan, I have three different G-band filters : Edmund Optics 10 nm, Andover 1.9 nm and Altair 2 nm. The Andover 1.9 nm is the best overall filter I have for visual observ...

christian viladrich

Great shots Alan !!

christian viladrich

Great test Alexandra ! This is exciting news.

The comparison between W29, 540 nm and G-band is very informative. The G-band seems to be a killer with the TEC 140.

Some bright filament points are visible in the penombra of the big spot :-)

I've done some testing today. Sounds good too :-)

christian viladrich

In any case the price is reasonnable. Maybe I could use one, one of these days.
Thanks for pointing this !

christian viladrich

I’m a bit surprised that no one is currently making a solar. SSM for sale. Certainly it’s a small market, but there does seem to be enough demand that someone could make a reasonable profit building and selling these. It is a bit of a niche market. You can try DIY, of find somebody willing to make ...

christian viladrich

Promissing results Douglas ! I think you are the first to try to shoot H-alpha with an uncoated mirror. You can specify the sensing parameters (etalon,gain, exposure). If the values were reasonable, this opens another way, using a 250-300 mm uncoated mirror, where there would be several times more l...

christian viladrich

Hi, What would be the use of the diaphragm ? The only time I stop down the aperture of a telescope is for Ca K full-disk imaging. This is for reason of f-ratio and heat load. This is no need for a diaphragm for this, only a piece of cardboard. On top of that I use white cardboard so it does not warm...

christian viladrich

The contrast of faculae increases when you go to the blue end of the visible spectrum. This is related to the difference of temperature between the faculae and their surrounding, and to the profile of the black body spectrum. So, if you observe with a camera, we will see more and more focalae (and n...

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