Calcium lines contrast enhanced using AstroSurface

I reworked a couple of my CaIIH/K images with the objective to increase the contrast. I was able to do this using AstroSurf. 

Workproces

- Inti processing of CaII Ser files

- DeNoise AI to remove noise 

- Astrosurface : wavelets, mostly high frequency and Local contrast enhancement

- CS4 : unsharpen mask, noise reduction (what's left) and false coloring and adjusting brighness.

These are the results; I may conclude that difference between first two (July 25) and third picture (July 4th) is due to active versus quiet Sun. 

Sun on July 25 - HeID3 using FeI

 

Imaging the Sun on July 25the in good conditions. Seeing about 1arcs average, measured using SSM3. Tilt is back in basic condition and below 0,2°.

HeID3 imaged was processed with Inti and started from the FeI line instead of NaID2 line. By doing this a smaller ROI could be used. Scanspeed remained at 16x resulting in a sx/sy of 1,8. To improve I will reduce the speed next time. The HeID line is about -142 pixels away from the FeI line, compared with the NaD2 line which was about -250 pixels. Winning more then 100pixels on data. 

The solar tornado is visible in all lines except MgIB2.

MgIB2 shows finer and sharper details in the active sun which are more blurred in H-alpha, HeID3 and both calcium ion lines. 

Calcium images are processed using Inti and edited with DeNoise AI and AstroSurface: wavelets, local contrast. This way it brings more structure, typically supergranulation. 

Solar Tornado

During my morning imaging session with my Sol'Ex spectroheliograph, I captured a striking "solar tornado" anchored along the western solar limb. Driven by complex magnetic flux ropes suspending plasma in the corona, these colossal structures only mimic terrestrial whirlwinds in visual projection. This observation highlights the remarkable ability of modern amateur spectroheliography to capture dynamic solar physics in real time.

Setting: Sol'Ex by James R on TLAPO80/480 and ASI678MM

Herschel Wedge, 2nd Gen Slit and IR Cut filter

Software: SharpCap, Inti, DeNoise AI and CS4

Tilt <0,2°; Sx/Sy=1

Seeing avg 1 arcs measured using SSM3

Sun July 21 with Sol'Ex

National holliday in Belgium with some Sun at midday. I took time to adjust for HeD3 line in view of the coronal hole. Next, images were taken in CaIIH and CaIIK with good result. In all images the flare in AR4493 is visible... really cool.

Setting: Sol'Ex by James R on TLAPO80 and ASI678MM.
Tilt: not so good due to manipulation. May be I need to glue the connections together

Sx/Sy = 1

Software : SharpCap, Inti, DeNoise AI and CS4.

 

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Solex Processing HeID3 using INTI Software

While I previously relied on JSolex for spectroheliogram processing, I had not yet utilized Inti to process the neutral helium HeID3 spectral line. My motivation stems from the insights presented in Christian Buil and Valérie Desnoux’s book, Guide de l'observation solaire avec un spectrohéliographe. In particular, the potential of the HeID3 line to reveal low-contrast features such as coronal holes makes it a compelling target for high-resolution solar imaging. This post outlines a step-by-step workflow for processing HeID3 observations using Inti.

Version: Inti V7.0.3

After starting Inti, open the file and select "safe polynome coefficientt". Next run the proces by selecting Go! 

My ROI includes both the NaID2, FeI (5888,81) and HeID3 line. Inti uses the NaID2 line as reference. Christian mentiones that ROI with only FeI and HeID3 would be better.

Next, select Helium-Corona free page and mark "automatic polynome computation" and "Transversllium correction". The shift is currently not important and you can put in zero aswell. Offset 1 on -8 and Offset on 12. Run the process selecting Go!

Select Frame and Mean-Start. When doing this the shift from NaID2 to HeID3 will be calculated automatically. You can also select the line by clicking on the HeID3 line and pressing OK.  Next run the process by selecting Go!

Depending on the outcome, play around by changing the shift value by plus or minus 1 and find the most contrast image.

After editing in CS4, this is result... which also shows the coronal hole. 

Sun July 19 Sol'Ex

Imaging the Sun on July 19 using Sol'Ex on TLAPO80/480 and ASI678MM. On the eastern limb a new sunspot arises AR4492 with a nice peak prominence.