Search found 735 matches

by p_zetner
Mon Jan 15, 2018 8:08 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Some Natural Spectroscopy!
Replies: 5
Views: 130

Some Natural Spectroscopy!

The weather here has been quite frigid lately with high temperatures near -20C. Low temperatures and low Sun definitely curtail imaging and observing but, on the plus side, we are occasionally treated to beautiful displays of atmospheric phenomena involving atmospheric ice crystals. Today, we could ...
by p_zetner
Mon Jan 15, 2018 7:44 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: 2017 Annual Geomagnetic Data- Updated
Replies: 13
Views: 188

Re: 2017 Annual Geomagnetic Data

Beautiful work, Stu!

Cheers.
Peter.
by p_zetner
Sat Dec 30, 2017 5:20 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: 20Jun2017 Spectroheliograms: Cleaning House!
Replies: 4
Views: 191

20Jun2017 Spectroheliograms: Cleaning House!

Greetings Everyone. I wanted to do some house cleaning before the beginning of 2018 and finish processing some spectroheliograms that have been, more or less, lying dormant since June. Here are images at four more wavelengths to accompany my 20Jun2017 hydrogen results in a previous thread. four-mont...
by p_zetner
Wed Dec 20, 2017 6:25 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: 20Jun2017 Spectroheliograms: Hydrogen
Replies: 25
Views: 1181

Re: 20Jun2017 Spectroheliograms: Hydrogen

Some last words on the SHG lineshape function. Here is a figure showing model calculations of the line profile of a grating spectrometer for various slit widths. GaussBox siz.png These lineshape functions were calculated by performing a convolution of a box function representing the slit transmissio...
by p_zetner
Wed Dec 20, 2017 5:36 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: ROT2 command of IRIS
Replies: 53
Views: 2916

Re: ROT2 command of IRIS

Dear Toshio;
Welcome to the forum and congratulations on your SHG imaging.
Cheers.
Peter.
by p_zetner
Wed Dec 13, 2017 10:55 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: 20Jun2017 Spectroheliograms: Hydrogen
Replies: 25
Views: 1181

Re: 20Jun2017 Spectroheliograms: Hydrogen

Hi Christian. You got me interested in the SHG lineshape problem and I will do some more modelling calculations shortly! It seems pretty clear, though, that, under optimum conditions, the SHG lineshape will be Gaussian. For your interest in comparing the selectivity of a Gaussian vs Lorentzian line,...
by p_zetner
Tue Dec 12, 2017 7:18 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: 20Jun2017 Spectroheliograms: Hydrogen
Replies: 25
Views: 1181

Re: 20Jun2017 Spectroheliograms: Hydrogen

Hi Christian. In answer to your questions: >>>As we go from -0.55A to +0.55A, could we say we have about 0.09 A shift between two successive images ? Yes, the change in wavelength between frames is 0.092A. >>>It seems to me that the three images close to the centre line are very similar. In other wo...
by p_zetner
Sun Dec 03, 2017 11:06 pm
Forum: Great American Solar Eclipse August 21 2017
Topic: Wah!'s solar eclipse photos
Replies: 22
Views: 879

Re: Wah!'s solar eclipse photos

Amazing what you have accomplished, Wah!
Your latest result is easily as good as Druckmuller’s famous pictures.

Your Photoshop technique seems related to some of the multiresolution wavelet sharpening methods available in some image processing routines. Have you tried any of these?

Cheers.
Peter.
by p_zetner
Sun Dec 03, 2017 10:12 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: 20Jun2017 Spectroheliograms: Hydrogen
Replies: 25
Views: 1181

Re: 20Jun2017 Spectroheliograms: Hydrogen

Hello Phil and Christian. Thank you both for your kind comments. There is more information about my SHG in a somewhat recent article I wrote for the Spectroscopy section of the "Amateur Astronomy Association Germany (VdS)". The article is in Spektrum No.52 - 2017 ( http://spektroskopie.fg-vds.de/ind...
by p_zetner
Thu Oct 05, 2017 11:29 pm
Forum: This is SolarChat !!
Topic: 250mm Aries ERF on RCT/DS Lunt 35
Replies: 23
Views: 777

Re: 250mm Aries ERF on RCT/DS Lunt 35

That is an impressive and exciting piece of equipment, Stu! First results look very promising. Now comes the long wait for better spring / summer seeing. Looking forward to your progress.

Cheers.
Peter.
by p_zetner
Thu Sep 07, 2017 2:06 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: 20Jun2017 Spectroheliograms: Hydrogen
Replies: 25
Views: 1181

Re: 20Jun2017 Spectroheliograms: Hydrogen

Hi Phil. Many thanks for your visit and comments. As far as your questions go: - What is the original size of the disk (height in pixels) ? The original disk size in vertical (non-dispersive) direction is ~ 2050 px. - Do you work with capture in 8, 10, 12 bits ? At the moment, I only use 8-bit depth...
by p_zetner
Thu Sep 07, 2017 2:05 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: X9.3 Flare Geomagnetic Effect
Replies: 5
Views: 214

Re: X9.3 Flare Geomagnetic Effect

What an incredible capture, Stu! I always thought it was just charged particle flux that messed with the magnetosphere. This UV effect is amazing!

Cheers.
Peter.
by p_zetner
Thu Sep 07, 2017 1:58 pm
Forum: Great American Solar Eclipse August 21 2017
Topic: Wah!'s solar eclipse photos
Replies: 22
Views: 879

Re: Late solar eclipse photos

Beautiful work, Wah.

Love the spectrum .... that beautiful coronal iron line!

Peter.
by p_zetner
Thu Sep 07, 2017 1:56 pm
Forum: This is SolarChat !!
Topic: High resolution animation
Replies: 7
Views: 347

Re: High resolution animation

Beautiful animations.

Peter.
by p_zetner
Thu Sep 07, 2017 1:55 pm
Forum: This is SolarChat !!
Topic: 6th Sept AR2673 just after the X class flare, blink of loops added
Replies: 12
Views: 433

Re: 6th Sept AR2673 just after the X class flare, blink of loops added

Beautifully done!

Those off-band loops are stunning .... what a catch!

Peter.
by p_zetner
Thu Sep 07, 2017 1:54 pm
Forum: This is SolarChat !!
Topic: Frustrations and Success Today
Replies: 13
Views: 416

Re: Frustrations and Success Today

Nice shots, Brian.

Peter.
by p_zetner
Thu Sep 07, 2017 1:53 pm
Forum: This is SolarChat !!
Topic: Today's catch
Replies: 4
Views: 184

Re: Today's catch

Beautiful shots!

Peter.
by p_zetner
Wed Jul 19, 2017 10:14 pm
Forum: This is SolarChat !!
Topic: Firts light with SolarSpectrum 0.3A, C8 Edge-HD on July 14
Replies: 12
Views: 487

Re: Firts light with SolarSpectrum 0.3A, C8 Edge-HD on July 14

Terrific image, Christian.
Looking forward to more.

Cheers.
Peter.
by p_zetner
Sun Jul 16, 2017 2:21 am
Forum: This is SolarChat !!
Topic: 2nd Foray into Hi-Res Imaging! (Ca K added.)
Replies: 12
Views: 408

Re: 2nd Foray into Hi-Res Imaging! (Ca K added.)

Thanks Eric and Brian.

Still need to work on improving contrast in H alpha.

Best regards.
Peter.
by p_zetner
Sat Jul 15, 2017 11:20 pm
Forum: This is SolarChat !!
Topic: 2nd Foray into Hi-Res Imaging! (Ca K added.)
Replies: 12
Views: 408

Re: 2nd Foray into Hi-Res Imaging! (Ca K added.)

Thanks for the feedback, everyone. Mark: Definitely have to aim for a telecentric with higher f number. I will try to configure f50 with a reducer following. The Omega CaK filter is this one http://www.ebay.ca/itm/Optical-Filter-Astronomy-393-37SC0-2-Ca-II-K-filter-1-25-Extremely-2Angstrom-/15261859...
by p_zetner
Sat Jul 15, 2017 1:27 am
Forum: This is SolarChat !!
Topic: 2nd Foray into Hi-Res Imaging! (Ca K added.)
Replies: 12
Views: 408

Re: 2nd Foray into Hi-Res Imaging! (Ca K added.)

Thanks very much, Franco!

Here is a view of the active regions 2666 and 2665 in Ca K.

Cheers.
Peter.
Crop_085721_0000_pp_siz_ARL5x5_lins_shrp_flat-corr_proc_lbls.png
Crop_085721_0000_pp_siz_ARL5x5_lins_shrp_flat-corr_proc_lbls.png (628.17 KiB) Viewed 381 times
by p_zetner
Fri Jul 14, 2017 5:33 pm
Forum: This is SolarChat !!
Topic: 2nd Foray into Hi-Res Imaging! (Ca K added.)
Replies: 12
Views: 408

2nd Foray into Hi-Res Imaging! (Ca K added.)

Greetings Everyone. I now have my feet wet and understand a little more about approaching high magnifications / resolution. Here is an image of AR12665 with good seeing and a focal length of ~5600mm. System speed is f/28 which is a little fast for the Daystar giving about 0.7A fwhm bandwidth, accord...
by p_zetner
Thu Jul 13, 2017 4:06 pm
Forum: This is SolarChat !!
Topic: Quick session this morning 13/7/17 with Tal/PST mod
Replies: 9
Views: 359

Re: Quick session this morning 13/7/17 with Tal/PST mod

Beautiful image, David.

Is it my monitor or is there a problem with black level in the spot umbra?

Cheers.
Peter.
by p_zetner
Thu Jul 13, 2017 4:04 pm
Forum: This is SolarChat !!
Topic: Sol from the 12th of July 2017.
Replies: 7
Views: 292

Re: Sol from the 12th of July 2017.

Startling detail on those full disks, Eric. Wonderful!

Cheers.
Peter.
by p_zetner
Thu Jul 13, 2017 4:01 pm
Forum: This is SolarChat !!
Topic: Morning Sun with AR2665
Replies: 7
Views: 232

Re: Morning Sun with AR2665

Beautiful set, Stu.

I was able to do some imaging this morning (13Jul) and the peculiar light bridge seems to be gone. Haven't processed yet so can't say definitively.


Cheers.
Peter.