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FORUMS Photo Sharing & Visual Enjoyment Astronomy & Celestial 
Thread started 21 Feb 2019 (Thursday) 12:29
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The Official Imaging the Sun Thread

 
MalVeauX
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Feb 21, 2019 12:29 |  #1

Heya,

More and more folk are shooting the sun in all kinds of setups and wavelengths of light. Our star is such a dynamic and interesting body that gives you 8 minute old unique light all the time. It changes daily, and drastically changes over just minutes to hours. Each day can have a new feature in various wavelengths. Please feel free to join in and post your images of the sun, no matter what you used or how it turned out and let's help each other image our dynamic star!

Very best,


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MalVeauX
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Post edited over 1 year ago by MalVeauX.
     
Feb 21, 2019 12:34 |  #2

Feb 21 2019

We are in cycle 24 still, approaching the peak of the solar minimum (an 11 year cycle).

Currently no sunspots are visible on the disc.

There are a few minor prominences around the limb. There is a large filament and plage region that is active and the filament is very large and persistent.

Here's the full disc and large filament presented in false color and hydrogen alpha wavelength (6562.8A, ultra narrowband) today:

IMAGE: https://farm8.staticflickr.com/7905/47168045761_9ac459166a_c.jpg
IMAGE LINK: https://flic.kr/p/2eS5​yGi  (external link) SolarDisc_60mm_HA_DS_C​olored_02212019 (external link) by Martin Wise (external link), on Flickr

IMAGE: https://farm8.staticflickr.com/7862/47168045441_fe191f5d55_c.jpg
IMAGE LINK: https://flic.kr/p/2eS5​yAM  (external link) SolarDisc_60mm_HA_DS_C​olored_Inverted_022120​19 (external link) by Martin Wise (external link), on Flickr

The large filament in a high resolution mosaic:

IMAGE: https://farm8.staticflickr.com/7853/40203554883_5c3c7fbd90_c.jpg
IMAGE LINK: https://flic.kr/p/24fD​Jcn  (external link) FilamentPlage_200mm_HA​_Colored_Inverted_0221​2019 (external link) by Martin Wise (external link), on Flickr

IMAGE: https://farm8.staticflickr.com/7880/33293268218_cc54f17f0a_c.jpg
IMAGE LINK: https://flic.kr/p/SJ1G​HQ  (external link) FilamentPlage_200mm_HA​_Colored_02212019 (external link) by Martin Wise (external link), on Flickr

Earth to Sun Scale (to show the size of this feature compared to Earth, note that 109 Earth Diameters fill the Diameter of the Sun):


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Equipment used:

C8 Edge HD SCT telescope with a full aperture tri-band Aires D-ERF
ST80 (80mm F5) Refractor telescope (masked to 60mm)
Daystar Quark Chromosphere (HA filter)
ASI174MM (USB CMOS camera) + 0.5x Focal Reducer

IMAGE: https://farm8.staticflickr.com/7801/46435060184_d54bf4653b_z.jpg
IMAGE LINK: https://flic.kr/p/2dKi​PBW  (external link) X10S1124-copy (external link) by Martin Wise (external link), on Flickr

Very best,

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Tom ­ Reichner
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Post edited over 1 year ago by Tom Reichner.
     
Feb 21, 2019 12:38 |  #3

.
I prefer to have the Sun in a supportung role, rather than being the primary subject of interest.

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.

"Your" and "you're" are different words with completely different meanings - please use the correct one.
"They're", "their", and "there" are different words with completely different meanings - please use the correct one.
"Fare" and "fair" are different words with completely different meanings - please use the correct one. The proper expression is "moot point", NOT "mute point".

  
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MalVeauX
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Feb 21, 2019 12:39 |  #4

Tom Reichner wrote in post #18815834 (external link)
...

Lovely context Tom, I love environmental solar system body images like this. :-)

Very best,


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Archibald
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Feb 21, 2019 14:01 |  #5

Amazing shots of the sun. And as you say, changing all the time. And I can't help but think that time-lapse movies have been made of the roiling surface.


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MalVeauX
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Feb 21, 2019 14:18 |  #6

Archibald wrote in post #18815882 (external link)
And I can't help but think that time-lapse movies have been made of the roiling surface.

Watching it real time is amazing, but time lapse just shows how ridiculous fast these large structures are moving. You can look at SDO/Gong and do time lapses at smaller scale and watch how things change in 30 minutes, etc, and it's nuts how things are moving many thousands of miles in minutes. I've done some time lapses in the 30~60 minute range, and even then, you can see changes in spicules as they whip around like grass in the window, convection cells boil and move, filaments move around, prominences climb and fall like plasma rain back into the chromosphere, etc. Its truly crazy. The scale is bonkers.

Being different, just minutes apart each day, let alone daily, or weekly, is what is so interesting about our star to me. So dynamic and ever changing unlike every other subject you can look at in the sky that are unchanging virtually. But having a star this close to us, we get to see creation itself in real time with a latency of 8 minute old photons!

Very best,


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DavidWatts
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Post edited over 1 year ago by DavidWatts.
     
Feb 21, 2019 18:55 |  #7

Can't have a thread for the Sun without an eclipse. Aug. 21, 2017, from Box Butte Fairgrounds in Hemingford, NE. Shot through a Thousand Oaks solar filter, Canon 400mm 5.6 L and Canon 5D3.

IMAGE: https://photos.smugmug.com/photos/i-brBBvvh/0/8bbc765b/X3/i-brBBvvh-X3.jpg

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MalVeauX
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Feb 21, 2019 19:49 |  #8

DavidWatts wrote in post #18816054 (external link)
...

Sweet prominence captured too!

Very best,


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DavidWatts
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Feb 21, 2019 19:53 |  #9

MalVeauX wrote in post #18816089 (external link)
Sweet prominence captured too!
Very best,

Thanks! :-)


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MalVeauX
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Feb 23, 2019 19:16 |  #10

Feb 23rd 2019

Today's filament & plage progress in high resolution (mosaic of 3 images) & full disc

IMAGE: https://farm8.staticflickr.com/7866/33315844478_b13812b5d0_c.jpg
IMAGE LINK: https://flic.kr/p/SL1p​RG  (external link) FilamentPlage_200mm_HA​_DS_Colored_02232019 (external link) by Martin Wise (external link), on Flickr

IMAGE: https://farm8.staticflickr.com/7886/40226508683_14227374bf_c.jpg
IMAGE LINK: https://flic.kr/p/24hF​nyx  (external link) FilamentPlage_200mm_HA​_DS_Colored_Inverted_0​2232019 (external link) by Martin Wise (external link), on Flickr

IMAGE: https://farm8.staticflickr.com/7853/32249272527_cb51d779c7_c.jpg
IMAGE LINK: https://flic.kr/p/R8KX​b8  (external link) SolarDisc_60mm_HA_DS_C​olored_02232019 (external link) by Martin Wise (external link), on Flickr

IMAGE: https://farm8.staticflickr.com/7896/32249272227_d2c1df43d3_c.jpg
IMAGE LINK: https://flic.kr/p/R8KX​5X  (external link) SolarDisc_60mm_HA_DS_C​olored_Inverted_022320​19 (external link) by Martin Wise (external link), on Flickr



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sandwedge
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Feb 24, 2019 11:14 |  #11

I love your images of the Sun, MalVeauX! I'll contribute with a previously posted photo of the ISS silhouetted by the Sun (with some nice sunspots thrown in).


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MalVeauX
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Feb 24, 2019 11:16 |  #12

sandwedge wrote in post #18817703 (external link)
I'll contribute with a previously posted photo of the ISS silhouetted by the Sun (with some nice sunspots thrown in).

That is awesome!

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Tom ­ Reichner
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Feb 24, 2019 13:02 |  #13

MalVeauX wrote in post #18817344 (external link)
.
(Unspecified manufacturer) Telescope @840mm • 1/100 • f/17 • ISO 100

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.
Only 840mm focal length - wow! . That surprises me.

So now I am thinking that if you got this detail at 840mm, I should be able to get something very close with my 800mm lens at the same relative exposure values. . Would this be correct?

Before someone butts in and says, "try it yourself", please realize that it will be cloudy where I am for the rest of the day today and almost all day tomorrow. . So I can't try it myself for at least 26 hours, and I don't want to wait 26 hours to know whether this will work or not. . I wanna know right now.


.


"Your" and "you're" are different words with completely different meanings - please use the correct one.
"They're", "their", and "there" are different words with completely different meanings - please use the correct one.
"Fare" and "fair" are different words with completely different meanings - please use the correct one. The proper expression is "moot point", NOT "mute point".

  
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MalVeauX
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Post edited over 1 year ago by MalVeauX.
     
Feb 24, 2019 14:41 |  #14

Tom Reichner wrote in post #18817754 (external link)
.
Only 840mm focal length - wow! . That surprises me.

So now I am thinking that if you got this detail at 840mm, I should be able to get something very close with my 800mm lens at the same relative exposure values. . Would this be correct?

Before someone butts in and says, "try it yourself", please realize that it will be cloudy where I am for the rest of the day today and almost all day tomorrow. . So I can't try it myself for at least 26 hours, and I don't want to wait 26 hours to know whether this will work or not. . I wanna know right now.

.

Hey Tom,

So, it's not the focal length that matters, it's the aperture that matters. Focal length merely influences imaging scale. Apertures defines resolution with the limit being the seeing. That said, a small aperture (40~60mm) will easily resolve detail on our local star because it occupies 1 degree in the FOV. It's so big. So magnifying it just a little bit, with a little aperture, you can see the small patches of spicules and other features.

A small camera lens can produce this. It has, again, nothing to do with focal length. It has everything to do with (1) the filter being used (ultra narrowband), (2) aperture (defining resolution of what detail you can accomplish), (3) seeing (quality of air turbulence).

You can easily do this with a small camera lens. But you have to filter it down to 656.28nm wavelength to see what I'm producing here. And to that extent, you have to go sub-angstrom (1 angstrom = 0.1nm). This is ultra narrowband. A larger aperture of a lens/scope/etc/ will then resolve more detail (Dawe's limit). From there, focal length merely influences imaging scale and sampling (relate this to focal-ratio and pixel size in micro-meters, this is how you sample resolution appropriately).

So yes, you can totally do it with your instruments. You just need appropriate filtration to eliminate all the light except a single wavelength down to the sub-angstrom level.

The above image was done at 840mm focal length, 60mm aperture (producing F14 focal-ratio). My IMX174 sensor has pixels that are 5.86um in size. Ideally I should sample around F29, but I severely under-sampled at F14 so I lost detail. But, it was the only way I could get a full disc image in the FOV with my setup.

My larger system has a native focal length of 8400mm at F42. That's what produced the larger imaging scale image of the details on the surface. But the detail did not come from resolution, it came from the 200mm aperture (8 inche opening into the OTA).

Unfortunately terrestrial photography gear has the misnomer that aperture is the f-stop number, but it's not. Aperture is the diameter of the opening into the imaging train. Focal-ratio is the f-stop number as a relationship of aperture size to focal length. It gets confusing for terrestrial photography. All that matters in the optical train for resolution is aperture. Focal-ratio just defines imaging scale.

Very best,


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Archibald
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Feb 24, 2019 14:59 as a reply to  @ MalVeauX's post |  #15

Why do you need a narrowband filter? Why not take the whole spectrum? (... with suitable attenuation...)


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The Official Imaging the Sun Thread
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