31.8.20

31.08.2020 Fuzzy prom and W/L disk.

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Monday 31st 70/64. Wasted some time trying to fathom out the drives. A lost cause. 

11.50 Lots of cloud. Captured some proms with the PST BF.

The area of surface disturbance wasn't cooperating with contrast nor the seeing conditions.

No images worth sharing. Even the prom was more like a chalk drawing after I had messed about with it.

The white light solar disk was an experiment with my 88mm, fluorite, APO, spotting scope and Lumix G9 camera. 25x on the Kowa '884 equates to 2000mm f/l equivalent with Micro 4/3. Image downsized from 5184 pixels original to 1000 for the blog.

I used a home made, full aperture Baader, solar foil filter. Quite pleased with the uniformity of brightness across the disk, limb darkening and decent limb sharpness. Shame there were no surface features to confirm best focus. Or even just for interest.




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30.8.20

30.08.2020 No luck.

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Sunday 30th 10am 66/61F bright start but increasingly cloudy.

Another interesting start: AWR was showing the wrong LST. Had to reset RTC by an hour.
Updated C-Du-C to 4.3 Beta. Telescope is still showing +1 instead of - for Observatory site.This despite observatory being entered correctly as East of Greenwich in Set-up and shows correctly. The C-Du-C cursor was off the bottom of the star map until I synced on the Sun! 

10.30 Huge plate of thick, grey cloud. Nothing worthwhile captured yet.


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29.8.20

29.08.20 Filaments.

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Saturday 29th  Breezy, with sunshine and showers. Large plates of cloud causing long gaps between captures.

15.00 72/67F. Two large filaments and a large disturbed area in the NE quadrant. No obvious proms. B1200 + 1.6x GPC.

Seeing rather steady but images need to be pushed hard in processing for detail.

















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25.8.20

25.08.2020 Poor seeing no results.

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Tuesday 25th 08.30. 60F. A clear, bright start but little to see on the Sun. One indistinct smudge in the south and a rather small prom at 10.30 on the NE limb.

I tried capturing them using both BFs in turn and various GPCs. 

09.30. Paused for coffee and toast indoors. The seeing won't support the necessary magnification on the prom. 1500mm f/l x 2.6 GPC. Though I seriously doubt the GPC provides the stated power being so close to the camera. 2.6x refers to a far more distant placing on the nose of the TS binoviewer. 

9.45 Small clouds are crossing now as I wait and hope for better seeing conditions. The sun is moving beyond the nearby, shed roof. 


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19.8.20

19.08.20 Late afternoon with very poor seeing.

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Wednesday 19th 18.20 80/74F. Back to check the seeing conditions.

Three distinct disturbed areas. SE near the limb. A spot high in the northern hemisphere and a much larger area deep in the south.

The seeing was "simmering" and very difficult to process into anything worthwhile.





















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17.8.20

17.08.2020 A beginner's guide to simple, H-alpha solar imaging.

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There are a lot of very simple rules to maximize one's progress at solar imaging.  I was a beginner only recently and had to learn from others to make any progress at all. I pored over solar and other forums. I read the blogs and websites. I read the equipment reviews. I watched countless YouTube videos and tutorials. All this gave me a basic grounding in what was required. Mostly they don't dwell on the simplest ways to increase personal progress:

Practice, practice, practice, practice. If you want to get ahead then you have to teach your own head what works for you and what doesn't. Most solar imagers probably spend a tiny fraction of the time I have invested in this pastime over quite a short period. Which is fine if you have the time to learn slowly. I felt I didn't and wanted to cut the 10 year apprenticeship to a few short months.

As I am long past retired I have almost unlimited daytime hours to work at my solar imaging. My only hope of improving, within an acceptable time frame, at my age, was and remains endless practice. That way I make all my mistakes early on and can then discard poor methods and routines.

It also needs enough equipment, of sufficient quality, to avoid having too many handicaps. An old achromatic refractor and the innards of a PST still need a suitable camera and protective filters. A sub aperture D-ERF will save serious money but with serious potential risks.

Buying secondhand will get you a very long way, for much less than the terrifying prices of ready made solar telescopes. But only if you maximize the full potential of your equipment with endless practice.

If you are working all day long then your may not have the free spare time to hone your skills. So you must make every second count. That is much harder than repeated practice. Because you won't yet know what you are doing wrong. Steep learning curves are best tackled by the young. Otherwise it can all seem completely overwhelming.

Your driven mounting will be more useful if you mark the ground for the feet of your tripod or pier. That way you don't have to start from scratch by laboriously aligning the mounting every time. A solar finder is very useful for centring the sun before you can start imaging. Don't forget to remove or safely cover your normal finder! It is just too easy to look through it to find the sun! Making the telescope's shadow round is a quick and dirty way of aligning on the sun.

Choose a poor day to do housework. Things like aligning your mounting and updating your software. Don't waste valuable imaging time on such humble things. In typically, changeable weather it may be your only chance to see or capture a unique, or interesting, solar feature.
 
You certainly don't need an observatory for solar imaging. In fact and it may well impede your imaging with "very bad thermals."  White is usually considered good. Any other colour can be very bad indeed! So avoid making your observatory into a solar cooker!

The sun shining through the open slit of a dome will heat everything inside! Far too hot to handle! All that heat can only escape back out through the observing/imaging slit as wobbly, convection currents.

Many, very skilled imagers work outside. Or from a simple box with a roll-off roof. But not one covered in tar felt! Even bare wood and plywood can get very hot. Try painting it any other colour, than white and you will boil in there! 

Working out in the open, preferably on a lawn, is usually far better for steadier seeing. Early morning and late afternoon are usually best. So time your imaging, or visual observing, to maximize your own progress.

Foliage, crops and grass are cool. Buildings, concrete and asphalt get very hot. Guess which raises thermal currents to linger like a bonfire in your tiny, highly magnified, field of view?

Personal shade is very desirable and easily arranged. Even if it is the shadow of a building, tree, bush or balcony. A dark, peaked cap or wide brimmed hat really helps improve the contrast on your monitoring screen. A dark blanket over your head is apt to make you bake!

A recycled packaging box will help to shield a monitor or laptop from bright sunlight. Wear dark clothing to avoid being the hideously bright reflection in your own screen. These are all very simple methods to avoid undermining your own imaging progress.

Do your image processing indoors on a reasonable screen to be able to see your results clearly. An SSD is handy for carrying lots of large, video image files back indoors once the sun goes down.

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17.08.2020

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Monday 17th 81/78F clear and bright on the last day of the heatwave.

10.00 A later start: Steady seeing with high contrast after fiddling with the PST Etalon for more even brightness across the whole 800x600 frame.

Two obvious disturbances on the disk. Fitted the 2x GPC to ensure coverage of the larger disturbance. 


12.00 I had to close the dome to avoid a dust storm from the harvesting of the fields beside our home!

18.30Back after another long, hot day. Seeing transparent but "simmering." Results acceptable but not quite as hoped.





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16.8.20

16.08.2020 Continued: Late afternoon captures.

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18.00 90/81F. After a long hot day I returned to the fray to try and capture in better seeing.

There was greater clarity but not unlike looking through simmering water.

The changes in the filaments are very obvious over the period of these processed  captures.

As usual I experimented with processing in ImPPG and PhotoFiltre.

I could see dark streaks, probably  birds, racing across the field of view but too fast to identify the exact cause.


The 2x GPC was probably providing 3m of focal length.

While the small chip of the ZWO '174 camera amplified this considerably thanks to the crop factor.






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16.08.2020 South East disturbance filaments, one spot and surface drama.

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Sunday 16th August and the heatwave continues. 

07.45 Sun up on the dome.

Having some issues with window size and resolution on SharpCap.

08.22 74/70F lots of speckled cloud. Swapped from 2.6x to 2x GPC to get the entire SE disturbance in the frame. Pushing ImPPG much harder for more contrast. Stronger colours and processing in PhotoFiltre. I'm fed up with my images appearing wishy-washy when I post them online.


I made an interesting discovery in AS!3. I have tended to go for minimum Noise Robust instead of matching the seeing conditions. Setting Noise Robust to 3, instead of 2, actually helps bring out more detail. AP Grid is now set to 24 instead of 16.

09.37 80/75F Back to 2.6x GPC. A new disturbance nearer the limb. The clarity of the surface is improving but the thermal wobbles are limiting my ability to capture it.


09.47 81/76F Back to the main disturbance. 

09.58 82/76 Captured the small spot, central and high in the northern hemisphere.

10.26 84/79  Still here!  Occasionally rewarded by brief steadiness. 

10.45 87/81F Getting much too warm for comfort in the dome just as the seeing is steadying.

My processing is getting too extreme as I treat them as if they were from poor seeing conditions.




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15.8.20

15.08.20 Two disturbances, nice prom.

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Saturday 15th 07.30 67/65F, bright and clear. Fine crescent moon high in SE. Early start. No GPC to start with while I judge the seeing. Wobbly. Low frequency, high amplitude.

Disturbances in the SE and N West.












Added 2x GPC for more scale. Pushed the processing harder for more relief.


Nice prom at 2 o' clock NW.




I captured an hour of 500 frame videos at one minute intervals for an animation of the prom. Now I haven't a clue how to make a  video of the batch processed images. 

I have downloaded GIMP and PIPP but neither is remotely obvious how to proceed.

Okay, I found a GIMP animation tutorial: Except that the link doesn't work. It is local to the support forum tutorial. So I can't post a live link here. Ever onwards!




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13.8.20

13.08.20 Poorer seeing conditions.

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Thursday 13th 76/64F, clear sky. Thermal wobbles. 

One disturbance decays as a new disturbance, in the south east, is moving away from the limb.

Trying the 2.6x GPC but the seeing won't support it. Just mush! Which is a shame because the transparency is better than recently. The gyrations are just too much to lock onto anything.


18.30 Back to check the later seeing conditions. Hopelessly soft and agitated.





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