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Solar Analemma. This outstanding image from Alexandra Hart taken over a period of 4 years charts the midday position of the sun in the sky throughout the year. The north–south component of the analemma results from the change in the Sun's declination due to the tilt of Earth's axis of rotation. The east–west component results from the nonuniform rate of change of the Sun's right ascension, governed by combined effects of Earth's axial tilt and orbital eccentricity.

Merry Christmas, Happy New Year and looking forward to a great solar cycle 25!

Welcome to Solar Chat! The best forum for Solar Astronomy
Moving forward from solar cycle 24 to 25

Search found 1106 matches

by MalVeauX
Mon Jan 27, 2020 11:26 pm
Forum: This is SolarChat !!
Topic: Full disc 27 January 2020
Replies: 5
Views: 29

Re: Full disc 27 January 2020

Lovely captures Rainer!

Very best,
by MalVeauX
Mon Jan 27, 2020 6:51 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Meade / Solarmax Etalon Future?
Replies: 17
Views: 573

Re: Meade / Solarmax Etalon Future?

Unfortunately its just a business to the business people. The same way medicine is just business for a supplier, but required for the end-user. As we measure ourselves in the billions, each individual matters less to larger entities like corporations, or business in general. I hope they all survive....
by MalVeauX
Mon Jan 27, 2020 2:20 pm
Forum: This is SolarChat !!
Topic: Sun from Brazil (Full disc in three lights - 20200127)
Replies: 10
Views: 90

Re: Sun from Brazil (Full disc in three lights - 20200127)

Great discs Ronnie, love some CaK!

Very best,
by MalVeauX
Mon Jan 27, 2020 12:55 pm
Forum: This is SolarChat !!
Topic: AR2757 January 26th, 2020
Replies: 15
Views: 139

Re: AR2757 January 26th, 2020

Excellent Franco, nice to see a real spot again!

Very best,
by MalVeauX
Mon Jan 27, 2020 12:55 pm
Forum: This is SolarChat !!
Topic: AR12757 in White Light
Replies: 8
Views: 79

Re: AR12757 in White Light

Excellent Salvo, haven't seen an umbra/penumbra in a while!

Very best,
by MalVeauX
Mon Jan 27, 2020 12:54 pm
Forum: This is SolarChat !!
Topic: AR2757
Replies: 6
Views: 71

Re: AR2757

Nice Paul, good to see a spot!

Very best,
by MalVeauX
Mon Jan 20, 2020 6:21 pm
Forum: This is SolarChat !!
Topic: Solar Imaging Tutorial, Focus, Flat Calibration, Exposure | Jan 20th 2020
Replies: 7
Views: 141

Solar Imaging Tutorial, Focus, Flat Calibration, Exposure | Jan 20th 2020

Hey all, It rained all day yesterday, but today a cold front came through and its clear so far. I used the time to do a quick video tutorial on my workflow for acquiring data that I process into images later. FireCapture is the software I'm using specifically because it allows real time flat calibra...
by MalVeauX
Sun Jan 19, 2020 8:57 pm
Forum: Solar Scope Modifications
Topic: Baader 1.25x GPC with PST Mod, How to Mount the GPC?
Replies: 12
Views: 240

Re: Baader 1.25x GPC with PST Mod, How to Mount the GPC?

Hi Marty, You have added the filter precisely where I tried and found the etalon moved backwards by the thickness of the filter housing. Not sure this matters but I just preferred a more stealthy filter setting which did not push the fittings apart. Thanks, Ideally I will put the filter through the...
by MalVeauX
Sun Jan 19, 2020 8:01 pm
Forum: Solar Scope Modifications
Topic: Baader 1.25x GPC with PST Mod, How to Mount the GPC?
Replies: 12
Views: 240

Re: Baader 1.25x GPC with PST Mod, How to Mount the GPC?

Thanks, Here's what I did. Nothing permanent. Worked it seems from my test on the sun both visually and with camera. After I test more later on a day with good enough weather, I will determine a more permanent and stable way to set the GPC here and keep it centered without "luck." The outer ring and...
by MalVeauX
Sun Jan 19, 2020 6:49 pm
Forum: Solar Scope Modifications
Topic: Baader 1.25x GPC with PST Mod, How to Mount the GPC?
Replies: 12
Views: 240

Re: Baader 1.25x GPC with PST Mod, How to Mount the GPC?

Ok, so I got my 30 seconds to test it finally. Sheesh had to wait through a lot of clouds. It was able to focus with room to spare. Contrast was great. Visible detail was great. Image scale definitely was increased (finer). Seems to be working? I didn't have to mod the AOK Swiss adapter. I just plac...
by MalVeauX
Sun Jan 19, 2020 5:11 pm
Forum: This is SolarChat !!
Topic: January 17th Session
Replies: 15
Views: 174

Re: January 17th Session

Wonderful captures Brian!

Very best,
by MalVeauX
Sun Jan 19, 2020 5:11 pm
Forum: This is SolarChat !!
Topic: Full Disc 17 January 2020
Replies: 11
Views: 144

Re: Full Disc 17 January 2020

Great discs Rainer!

Very best,
by MalVeauX
Sun Jan 19, 2020 5:10 pm
Forum: This is SolarChat !!
Topic: Today's SUN (20200119) | TV101, LUNT60, LUNT60 Ca-K
Replies: 13
Views: 278

Re: Today's SUN (20200119) | TV101, LUNT60, LUNT60 Ca-K

Great discs Pedro, love CaK!

Very best,
by MalVeauX
Sun Jan 19, 2020 5:10 pm
Forum: This is SolarChat !!
Topic: Ha Full Disk & S6348 - 19th January
Replies: 15
Views: 152

Re: Ha Full Disk & S6348 - 19th January

Lovely disc Mark!

Very best,
by MalVeauX
Sun Jan 19, 2020 4:21 pm
Forum: Solar Scope Modifications
Topic: Baader 1.25x GPC with PST Mod, How to Mount the GPC?
Replies: 12
Views: 240

Re: Baader 1.25x GPC with PST Mod, How to Mount the GPC?

If your telescope you are using it with has 16cm backfocus or more, why would you put the glasspath more to the front? Just mount it in the nosepiece of and right before the etalon. Hi Bart, So my front collimating lens is currently extended forward so that I don't have to bother with shortening an...
by MalVeauX
Sun Jan 19, 2020 3:24 pm
Forum: Solar Scope Modifications
Topic: Baader 1.25x GPC with PST Mod, How to Mount the GPC?
Replies: 12
Views: 240

Re: Baader 1.25x GPC with PST Mod, How to Mount the GPC?

Ok, maybe this will work. Any confirmation would be awesome: This: https://www.highpointscientific.com/zwo-t2-to-125-filter-adapter-t2-125?utm_source=google&utm_medium=cse&utm_term=ZWO-T2-125&gclid=Cj0KCQiAmZDxBRDIARIsABnkbYR0c_5CLCpcnPlb7e92TKpV4zMbhwjM2sK_SHkqxYDeOHKQw0crjSwaAloTEALw_wcB With This...
by MalVeauX
Sun Jan 19, 2020 2:18 pm
Forum: Solar Scope Modifications
Topic: Baader 1.25x GPC with PST Mod, How to Mount the GPC?
Replies: 12
Views: 240

Re: Baader 1.25x GPC with PST Mod, How to Mount the GPC?

Hrm, I wonder if this would do it: https://www.highpointscientific.com/zwo-t2-to-125-filter-adapter-t2-125?utm_source=google&utm_medium=cse&utm_term=ZWO-T2-125&gclid=Cj0KCQiAmZDxBRDIARIsABnkbYR0c_5CLCpcnPlb7e92TKpV4zMbhwjM2sK_SHkqxYDeOHKQw0crjSwaAloTEALw_wcB If that will thread into a standard 2" th...
by MalVeauX
Sun Jan 19, 2020 2:11 pm
Forum: Solar Scope Modifications
Topic: Baader 1.25x GPC with PST Mod, How to Mount the GPC?
Replies: 12
Views: 240

Re: Baader 1.25x GPC with PST Mod, How to Mount the GPC?

Thanks, I have the AOK Swiss adapters. So I could just slide it into the baffle. Good to know! That said, I may need to figure something else out. I extend my collimating lens forward with extensions, beyond the AOK Swiss adapter, so that I can insert deep into a scope's focuser to avoid needing to ...
by MalVeauX
Sat Jan 18, 2020 12:44 pm
Forum: This is SolarChat !!
Topic: FD and big prominence 18-01-2020
Replies: 9
Views: 137

Re: FD and big prominence 18-01-2020

Lovely, and really like the scale!

Very best,
by MalVeauX
Sat Jan 18, 2020 2:12 am
Forum: This is SolarChat !!
Topic: Solar Processing Tutorial (Rapid Workflow) for HA | Jan 16th 2020
Replies: 9
Views: 168

Re: Solar Processing Tutorial (Rapid Workflow) for HA | Jan 16th 2020

I also thank you for your notes on data acquisition. It's so important so maybe that is a good next tutorial. :) That's the plan, I hope to do it soon, it will be acquisition and information from focus, exposure (no gamma), histogram, flat frame and recording the stream in FireCapture specifically ...
by MalVeauX
Sat Jan 18, 2020 2:10 am
Forum: Solar Scope Modifications
Topic: Baader 1.25x GPC with PST Mod, How to Mount the GPC?
Replies: 12
Views: 240

Baader 1.25x GPC with PST Mod, How to Mount the GPC?

Hey all, I've seen this mentioned a lot, and saw one photo of it disassembled but no way to tell how it was assembled and mounted. I have the Baader 1.25x GPC to take F8 to F10 on scopes for PST mod use. However, how in the heck has anyone mounted this GPC securely in front of the front collimating ...
by MalVeauX
Fri Jan 17, 2020 5:51 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Meade / Solarmax Etalon Future?
Replies: 17
Views: 573

Re: Meade / Solarmax Etalon Future?

Bob Yoesle wrote:
Fri Jan 17, 2020 2:12 pm
Wouldn't it be poetic justice if Lunt bought back their original patents and possibly production infrastructure for pennies on the dollar at auction?
It would!

But then less competition :(

Very best,
by MalVeauX
Fri Jan 17, 2020 5:49 pm
Forum: This is SolarChat !!
Topic: Tuning or bandwidth?
Replies: 18
Views: 368

Re: Tuning or bandwidth?

There's a bit more to the tuning, since it's not just an issue of being on-band, it's about the transmission profile. The same reason a 0.3A single etalon will not eliminate the photosphere leaking through showing the double limb. Mean while, two 1A filters can stack and shave off the skirt of the t...
by MalVeauX
Fri Jan 17, 2020 12:17 am
Forum: This is SolarChat !!
Topic: Solar Processing Tutorial (Rapid Workflow) for HA | Jan 16th 2020
Replies: 9
Views: 168

Solar Processing Tutorial (Rapid Workflow) for HA | Jan 16th 2020

Hey all, I made an acquisition and processing tutorial a while back (3 years ago? Yikes!) and it is fairly dated in terms of what I'm doing these days. I've been asked for a long time to make a new one showing what I'm doing these days. Specifically how I'm processing a single shot image for both th...