Exploring the Sun: Amateur Solar Imaging Techniques

[sophiecentaur]

@davenn terrific detail. You are getting your money's worth.

 

[davenn]

@davenn terrific detail. You are getting your money's worth.

cheers mate

and I have just spent another AU$1400 today on a better camera
all the guys on various astro forums are telling me I should be using a monochrome camera for getting much better resolution
so I have purchased the ZWO ASI1600MM
https://www.bintel.com.au/product/zwo-asi1600mm-monochrome/

will be interesting to see the results

Dave

 

[davenn]

Hi guys

well the ZWO ASI 1600MM finally arrived ( after the postal system sat on it for 3 days

)
I did some comparisons between it and my ZWO ASI 178MC that had been the main solar cam up till today
The ASI 1600 is a 16MPix Monochrome camera

these first two are unprocessed ( SOOC ) , just resized for the forum
and ALL images are single frame only ( no stacking)

firstly ... the ASI 178MC using mono mode in SharpCap

Now the ASI 1600MM

NOTE:, tho the image from the 178MC looks more detailed. Strong brightness variation can be seen across the image compared to the 1600MM
What I discovered in processing was that the 1600MM image processed so much better and resulted in a significant increase in finer details

ASI178 processed ...

ASI1600 processed ...

There isn't really any comparison between the two ... the ASI1600 shows much better detail. Specially seen around the Active Region

Next post ... prominences

Dave

 

[davenn]

now some limb/prominences
Ohhh golly gosh !
again, these first two are unprocessed ( SOOC ) , just resized for the forum

ASI178MC

ASI 1600MM

The limb and prominences are just so much sharper for the 1600MM

The 1600MM with a little processing

Dave

 

[davenn]

The ASI 1600MM seems to have a better dynamic range ( well I would expect it to

)
it is easier to pull out prominences and still have a non- overexposed surface
please excuse the poor editing blotchiness in the dark area around the outside of the sun ( I don't claim to be the world's best editor

)

Dave

 

[sophiecentaur]

Nice pictures (as usual) Dave. As with the rest of (technical) life, you get what you pay for.
The detail after enhancement makes you want to touch it. It's that lovely illusion (as with the best TV pictures, viewed at the right distance) that you could just go closer and closer with no limit to the image detail.

 

[Stavros Kiri]

Nice pictures (as usual) Dave. As with the rest of (technical) life, you get what you pay for.
The detail after enhancement makes you want to touch it. It's that lovely illusion (as with the best TV pictures, viewed at the right distance) that you could just go closer and closer with no limit to the image detail.

I'm sure it's not just my digital device that ... I magnify, magnify, magnify ... and still get to see a picture of the Sun (huger and huger detail!) ...
Pretty cool!

 

[davenn]

Nice pictures (as usual) Dave. As with the rest of (technical) life, you get what you pay for.
The detail after enhancement makes you want to touch it. It's that lovely illusion (as with the best TV pictures, viewed at the right distance) that you could just go closer and closer with no limit to the image detail.

Thanks buddy

So true it looks like the AU$1400 for this latest camera was worth the expense

I'm sure it's not just my digital device that ... I magnify, magnify, magnify ... and still get to see a picture of the Sun (huger and huger detail!) ...
Pretty cool!

cheers
buddy

and these pix here have been compressed in physical and kb size by the forum software

here's a link to the larger ( but not full size) rendition that I posted on other forums that don't have the restrictions

https://s10.postimg.org/eamdzbxex/180120_ASI1600_Cap001sm.jpg

the finer detail around that active region ( right area centre right, just to the left of that dark filament ) really starts to stand outDave

 

[davenn]

A closer up view of the active region ...

 

[sophiecentaur]

Totes amaze - as they say.

 

[davenn]

The Sun in Ha, 28/01/2018
Finally some clear(ish) skies at a time of the day that I could do some observing and imaging
Some really nice prominences today ...but the surface was pretty much devoid of interesting features

Cheers
Dave

 

[Stavros Kiri]

Wow! It seems it's like "prominence day" today for the sun! ...

 

[davenn]

Wow! It seems it's like "prominence day" today for the sun! ...

yes, very much so
a nice collection

 

[davenn]

The Sun in Ha -- 4 Feb, 2018

Haven't seen much of the sun for the last week ( since last Sunday's images) Lunt LS60THa, ASI 1600MM camera and SharpCap software.
These are single frame images (no stacking)

A couple of cropped to zoom in on the prominences and a couple of full disk ... varying the exposure allows different features to be more easily seen

cheers
Dave

 

[sophiecentaur]

Nice pictures again, Dave. I wonder if it would be worth while tinkering with and stacking multiple exposures to include a bigger range of luminosities. I have a chum who has done this with some regular photographs and increased the contrast range successfully. (Just a thought)

 

[davenn]

07 Feb 2018, The Sun in Ha ...
Lunt LS60THa, ASI 1600MM camera and SharpCap software.
These are single frame images (no stacking)

https://www.facebook.com/photo.php?fbid=152900435412664&set=pcb.152900485412659&type=3
finally a reasonable spot group. The best for many months

cheers
Dave

 

[davenn]

10 Feb 2018, The Sun in Ha ... The very respectable sunspot group ( largest for at least 4 months) has moved further onto the disk and is displaying some good details. Lunt LS60THa, ASI 1600MM camera and SharpCap software. These are single frame images (no stacking)

the second image is closeup of the active region, the best for some months, the black sunspots can be seen along with the bright areas of flaring between them

cheers
Dave

 

[davenn]

The Sun in Ha, 3 March 2018

Been a couple of weeks since I last got a chance to do some solar observing/imaging some Ha images from today. One very large prominence and some filaments ... Lunt LS60THa and a ASI1600MM camera

Dave

 

[Stavros Kiri]

Awesome!
Some colour next time? (I like both)

 

[davenn]

hi guys and gals

for those interested in solar observations and imaging, I have found a very useful tool for determining the size of
features on the sun eg. sunspots, filaments and prominences etc

I present the Solar Ruler, available here ...
https://samuelastronomy.wordpress.com/tag/solar-ruler/

there is an English version here ...
http://thesolarexplorer.net/index.php/tutorial/article2/article2/the-solar-ruler
the download link is right at the bottom of the page

This is a PDF file that you load into your fav image processing program that is able to support the manipulation of layers when combined

For me, I use Photoshop (PS). I load in my solar image and I load in this PDF file they are in separate tabs at the top of the image viewing area

I resize the solar ruler image to equal the size of my solar image as close as possible, then I copy it and paste it over the top of the solar image.
I then use the move function to move the solar ruler image around so I can align it with the solar image to produce this result

Solar image is the first image from my previous post ...

NOTE: the image is seriously reduced in size and quality to be able to post on this forum

You can see I managed to get the solar and ruler image sizes to match reasonably well

I can now quickly determine the approx. size of that big prominence ... ~ 60,000 - 65,000 km in height above the suns disk !

Quite impressive
hope some finds this useful

Dave

 

[Stavros Kiri]

for those interested in solar observations and imaging, I have found a very useful tool for determining the size of
features on the sun eg. sunspots, filaments and prominences etc

hope some finds this useful

Some day I hope (for me) ... . Sounds like great tool!

65,000 km

Ah, a bit less than twice the perimeter of the earth! ... Ok, No big deal! ...

 

[davenn]

Ah, a bit less than twice the perimeter of the earth! ... Ok, No big deal! ...

perimeter isn't the important measurement, it is almost 5x the diameter ... that's the important value

remember we are looking at length of prominence say 60,000km round figures
diameter of the Earth 12,700 km round figures. The Earth fits INTO that prominence 4.7x ( 5x if you go out to the 65,000km measurement)

Three Earths side by side will fit through that dark centre part of the loop...

now that is significant

Dave

 

[Stavros Kiri]

now that is significant

I think it's significant anyway! Also it's ~ 1/6 of the distance Earth-Moon ! ...
[The "no big deal" was a joke ...]

(+ light takes about 1/5sec to travel it! ... That means relatively HUGE distance! ...)

 

[davenn]

Haven't been able to do any solar imaging for a bit over a month, mainly due to cloudy skies and or lack of activity on the sun
I could have imaged last Saturday 7th April very clear sky and some good prominences.
Only problem was that it was 35C outside and the heat was unbearable to be in for more than a few minutes,
let alone the amount of time to set up the scope and computer and do imaging. That would have taken at least 30mins,
28 - 29 mins more than I was prepared to endure

How does an astronomer overcome bad condition "blues" ... buy some more gear

So here is my new scope ... A Skywatcher EVOSTAR120 Black Diamond refractor
120mm objective lens and a 1000mm focal length giving a f-stop of 8.3
f-stop (ratio) = FL / aperture = 1000 / 120 = 8.33333...

It's been around 45 years since I last owned a refractor scope (discounting finder scopes)
This scope will get used for visual observing and imaging of solar, planetary, lunar and deep space
The camera in the photos below is the ZWO ASI 1600MM

Visual observing setup ... eyepiece and diagonal...

visible light imaging...

Solar Ha imaging through a Daystar Chromospheric filter...

close-up of the filter and imaging setup...

cheers
Dave

 

[sophiecentaur]

Hi @davenn Nice stuff. Sorry to hear about the weather. It would be nice to have a bit of Sun 'up here' too.
How easy is it to shift that 120mm refractor about? I have a lumpy 8" Newtonian and it's a pain to get it up and onto the mount. No wonder I tend to use my 80mm Equinox nearly all the time. I look around me and 'everyone' seems to be buying or making garden observatories which solve the lifting problem. But the only suitable site for one in my garden is too much in the faces of people using the garden for non astronomical purposes.

 

[davenn]

Hi @davenn Nice stuff.

cheers

Nice stuff. Sorry to hear about the weather. It would be nice to have a bit of Sun 'up here' too.

lots of sun, but it's been mainly during the week days when I am at work and now that we are getting well into autumn, the days are getting shorter and daylight saving ended easter weekend so the sun is too low in the west for me to observe by the time I get home from work.
Weekends are my only chances for solar observing now.

How easy is it to shift that 120mm refractor about?

quite light the tube, mounting rings and that green mounting bar total around 5.5kg

I have a lumpy 8" Newtonian and it's a pain to get it up and onto the mount. No wonder I tend to use my 80mm Equinox nearly all the time

yeah, I know that feeling with my Celestron 9.25" Schmitt-cass ... It's quite heavy

But the only suitable site for one in my garden is too much in the faces of people using the garden for non astronomical purposes.

a home observatory is out of the question for me
1... primary reason ... I'm renting the property
2... I'm deep in the red zone of light pollution for doing nite time astronomy

Back in NZ, I had a 2.5 x 2.5m garden shed obs. that I made the roof roll off

use my 80mm Equinox

just googled it, nice looking scope does your one have the 10:1 Crayford fine focuser ?
http://www.skyatnightmagazine.com/review/telescopes/sky-watcher-equinox-80-ed-apocheers
Dave

 

[sophiecentaur]

2... I'm deep in the red zone of light pollution for doing nite time astronomy

Can't win 'em all. It's not too bad here as there are no street lamps and the only pollution is from some garden lighting next door (she is security mad). My astrophotography efforts are put to shame by some club members who live close into London. The worse the conditions, the more nerdy you have to be. My problem is I have problems with the cold and laziness, limited budget and some other spending priorities. Some of your solar pictures are good justification for your spending, though.
BTW, what sort of solar energy rejection filter can you use with your 120mm? I thought there were limits to objective sizes for 'rear end' filtering. I have a shiny Baader filter for my 80mm objective but that is a poor man's solution to solar, I think.

 

[Stavros Kiri]

How does an astronomer overcome bad condition "blues" ... buy some more gear

Lol ... That always works, doesn't it?

 

[NFuller]

So here is my new scope ... A Skywatcher EVOSTAR120 Black Diamond refractor

Nice choice, Skywatcher has been known to put out some good equipment for a reasonable price. I actually just purchased my first refractor a few weeks ago: a Skywatcher esprit 80mm. But of course, I haven't had a clear night since I bought it!

 

[davenn]

Skywatcher esprit 80mm

this one ?

http://www.skywatcherusa.com/product/esprit-80mm-ed-triplet-apo-refractor/

But of course, I haven't had a clear night since I bought it!

haha yeah, that is pretty typical and every astronomer within a couple of 100 km's can blame you for the cloudy skies

Don't know if you read @sophiecentaur 's post #130, he has the 80mm Equinox
Dave

 

[davenn]

Can't win 'em all. It's not too bad here as there are no street lamps and the only pollution is from some garden lighting next door (she is security mad).

grrrr ... been there too in days gone by

My astrophotography efforts are put to shame by some club members who live close into London. The worse the conditions, the more nerdy you have to be.

yup, that's where you can use some of narrow band filters ... they give weird colours but still give awesome results in heavily light polluted areas
I haven't gone that path as yet. I just travel around an hour out of the city area to get to darker areas.

Some of your solar pictures are good justification for your spending, though.

cheers

BTW, what sort of solar energy rejection filter can you use with your 120mm? I thought there were limits to objective sizes for 'rear end' filtering.

For the Daystar Quark as shown in my photo above, it can handle up to 150mm objective before a ERF is needed
I bought the 120mm scope rather than the 102mm with the thought that I can always stop it down to ~ 100mm. This would still give a 40mm improvement over the Lunt 60mm scope and it would also kick the f-ratio up a bit to improve image sharpness over it's f8.3 @ 120mm

I have a shiny Baader filter for my 80mm objective but that is a poor man's solution to solar, I think.

The Baader filters are good white light filters and I will still use my one for sunspot imaging ( not that there are many of them lately ... solar minimum)Dave

 

[NFuller]

this one ?

http://www.skywatcherusa.com/product/esprit-80mm-ed-triplet-apo-refractor/

Yep, that's it.

Don't know if you read @sophiecentaur 's post #130, he has the 80mm Equinox

Yes. I don't know much about those scopes, but I'm sure they are of good quality. I believe it is a FPL53 doublet...

 

[davenn]

Yep, that's it.

sweet ! ... really nice looking scope and quite compact
What sort of mount do you have for it ?

Yes. I don't know much about those scopes, but I'm sure they are of good quality. I believe it is a FPL53 doublet...

I'm assuming, awaiting confirmation from @sophiecentaur , that it is this one ...
https://www.teleskop-express.de//sh...ox-80---80-500mm-Apo-with-aluminium-case.html

a good looking scope

 

[davenn]

The Sun in Ha 13 Apr 2018

Been off work all week with a not nice case of bronchitis, am feeling very unwell
but did decide to haul the gear out today and do some solar imaging
Reasonably quiet, 4 or 5 small filaments across lower part of disk, 2 groups of prominences on opposite limbs.
The new active region has moved further onto the disk and is showing an associated filament ...
The seeing conditions were better than yesterday
Lunt LS60THa, ZWO ASI1600MM and SharpCap capture software

Cheers
Dave

 

[sophiecentaur]

I'm assuming, awaiting confirmation from @sophiecentaur , that it is this one ...

Yes. That one looks like mine. It'svery nice. A great (some might say too blingy) finish and focuses well. The rotatable focuser could be better, though. A lot of manual filter changing and suchlike could perhaps make it come loose.