SolarChat!

Wah

Maybe this slit is suitable for your mirror testing application?
http://adamslab.co.uk/Students%20Lab/Ph ... uct_id=816

Wah

Yes, my slit is using chromium coating.
I still don't have time to test it because I just had some time to capture the sunspots 2396

Wah

I think seeing is the key factor to capture good images.
Good luck to all of you!

Wah

20150808 Sunspot 2396

Wah

Excellent results!

Allow me to remove the bands for you~

Wah

Glass doesn't dissipate heat very well as metal does, I was expecting the reflectivity be higher to reflect more solar heat away. For example, 95% reflectivity means only 5% of energy / heat is absorbed by the coating. Now the reflectivity is not very high, that means the glass being exposed to the ...

Wah

Light pass through the coating is very little, I only could see very dim image of the light bulb. So I guess 3X% of light is absorbed by the coating. I will do some stress test later when I have time and the weather goes fine. BTW, the manufacturer told me that such coating was designed to withstand...

Wah

Here is a reflectivity comparison to another glass slit that I have. http://adamslab.co.uk/Students%20Lab/Physics%20-%20Light%20and%20Optics?product_id=816 I took some pictures before and after reflection. The reflectivity of both slits are lower than my expectation, and the China made one is not a ...

Wah

I recently have tailor made several glass optical slits from mainland China.
The slits quality seems to be better than what I originally expected.
But the reflectivity is only about 62% which is lower than my expectation.

3 slits in one glass plate: 10, 20, 30 um
Glass plate 30X2mm

Wah

Wah

Good clean slit and no de-banding is needed!

Wah

Can you post the raw images, so I can help you to de-band them?

Wah

Hi Vincent, I think you must have at least rotated or skewed the images from the raw, haven't you?

Wah

It seems the images are not raw which the bandings are not vertical. That will dramatically increase the difficulty of removing them.

Wah

Peter, I notice that most of the images have dim left and right side and bright top and bottom.
Do you know what causes it?

I've tried to reduce such effect.

Wah

Stunning results!

I just wonder why it seems the solar poles in H-beta are featureless?

Wah

Wah

Let me process it.

Wah

You may download it from here:
http://www.hkastroforum.net/viewtopic.p ... 902#274902

Wah

Which function do you mean? I think the UI doesn't have a field called "scan box" ?

Wah

2nd trial to remove vertical stripes:

Wah

I use skew like this.

Wah

Congratulations!

You may use "skew" and "resize" (1 direction only) functions to make the solar disk round.

The upper part of the sun is a bit off band, it seems not from the smiling effect if the original video is in horizontal.

Wah

Thank you DSobserver for using my program!

Dear highfnum, does the pattern show in the raw avi?
If not, can you send me the video to let me try it?

Wah

Wah

Wah

Wah

Wah

What is Deslandres or Hale spectroheliograph?
Can you give me some more details?

I have found the earilest Ha images in the link above was 1908, it's after 1902.
http://bass2000.obspm.fr/gallery2/main. ... temId=9764

Wah

Spectroheliograms since 1893

http://bass2000.obspm.fr/gallery2/main. ... temId=9206

Wah

20150214 Valentines Sun

Wah

20150208 LS80T Sun

Wah

But I think except Halpha images, most of people don't have any chances to see other band images.
I guess watching Hbeta or even Hgamma, He-D3 solar disk would be interesting!
With limited of $$$$$$, SHS should be the only choice.

Wah

How about the visual experience?
What can you see through the scope and how do you feel?

Wah

I wonder how would it be if looking into a spectrohelioscope?
Is there anyone here having such experience?

It is difficult / nearly impossible to take images though SHS because of the difficulty of synchronizing the exposure time and frame rate with it?

Wah

A swimming pool should have lots of heat capacity, you may put it under water~

Wah

Because my SHG system doesn't have high spectral resolution, I always use only one pixel width to merge the solar disk.
I guess it should be about 0.2A.

Wah

I think it should be fine, you just need to install MS .net framework 2.0 or above.

Wah

Hi all,

I've got this program updated based on Ken's suggestion, you may have a look!
No need to install, just unzip it.
Thanks!

Wah!

Wah

Congratulations! Good to see such amateur professional results and I am now trying to introduce this to some of my friends from mainland China~

Wah

Hi all, I have thought of modifying my C8+PST to achieve higher resolution solar images. Before buying big ERF, I used a 40mm mask in front of C8 to see if it can focus well. After the test, it can focus with C8+PST. But it seem the sweet spot become very small, which is unexpected for me, because t...

Wah

How about using a daystar temperature control system? Hehehe…

Wah

I'm waiting for your better results!

Wah

I was always here. I did not fix the frame rate problem, but it just didn't happen this time~

Wah

Thank you!

I also have created a gif animation to show the disk near Ca-H line:
http://www.hkastroforum.net/viewtopic.php?p=286883

Here is a video showing prominence of Mg lines near the solar limb:
http://youtu.be/C36Z-a_SSxY

Wah

20141220 SHG Sun - CaH, Halpha, Hbeta, Hgamma, Hdelta

Wah

What can I submit for my SHG?

Wah

Any outlook photos?

Wah

Wah

Thank you all! The person who made this SHG is a friend of mine, that was why he used the program that I wrote to merge the lines. The 2nd camera was being use for helping the solar disk focusing, which I think is not necessary. Then he has suggested QHY upgrading the capturing software for merging ...

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