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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 70 matches

by ThomasHu
Fri Nov 30, 2018 11:07 pm
Forum: This is SolarChat !!
Topic: Proms of 20181129
Replies: 7
Views: 710

Proms of 20181129

Mono:
20181129Prom.jpg
20181129Prom.jpg (67.42 KiB) Viewed 710 times
by ThomasHu
Fri Nov 23, 2018 7:14 am
Forum: This is SolarChat !!
Topic: 20181123 Ha&CaH Solar
Replies: 6
Views: 676

20181123 Ha&CaH Solar

Ha:SkyRover 102ED F/7 +SM90+QHY5-III-174MCamera
CaH:SkyRover72EDAPO F/6+ES PM2X+DaystarCaHQuark+QHY5-III-174M
Capture_00001.jpg
Capture_00001.jpg (471.19 KiB) Viewed 676 times
09_37_45_lapl3_ap307_l.jpg
09_37_45_lapl3_ap307_l.jpg (305.69 KiB) Viewed 676 times
by ThomasHu
Mon Nov 19, 2018 1:06 pm
Forum: This is SolarChat !!
Topic: 20181119 AR2727
Replies: 3
Views: 427

20181119 AR2727

SkyRover102ED+SM90+TeleVue3X+QHY-5-III-290M Cmos Camera
11_33_58_lapl3_ap341-恢复的.jpg
11_33_58_lapl3_ap341-恢复的.jpg (286.52 KiB) Viewed 427 times
by ThomasHu
Wed Nov 07, 2018 6:26 am
Forum: This is SolarChat !!
Topic: 20181106&20181107 Peaceful Surface
Replies: 6
Views: 747

20181106&20181107 Peaceful Surface

with QHY5-III174M&178C Cmos Camera
20181106
09_31_30_lapl3_ap141.jpg
09_31_30_lapl3_ap141.jpg (594.87 KiB) Viewed 747 times
20181107
09_44_04_lapl3_ap139.jpg
09_44_04_lapl3_ap139.jpg (419.34 KiB) Viewed 747 times
by ThomasHu
Thu Nov 01, 2018 12:40 am
Forum: Solar Scope Modifications
Topic: My New BinChannel ERF
Replies: 13
Views: 1774

Re: My New BinChannel ERF

A Photo of the test report
20181101083850.jpg
20181101083850.jpg (11.54 KiB) Viewed 1581 times
by ThomasHu
Wed Oct 31, 2018 12:43 am
Forum: Solar Scope Modifications
Topic: My New BinChannel ERF
Replies: 13
Views: 1774

Re: My New BinChannel ERF

Valery wrote:
Tue Oct 30, 2018 3:16 pm
ThomasHu wrote:
Tue Oct 30, 2018 12:59 pm
Valery wrote:
Tue Oct 30, 2018 12:03 pm
What is the thickness of the filter?

It's designed for 40nm FWHM~
You do mean it's spectal bandwidth. I asked the thickness of the glass itself. 6mm, 10mm or 12mm ?


Valery
My friend replied me. It's 4.5mm
by ThomasHu
Wed Oct 31, 2018 12:30 am
Forum: Solar Scope Modifications
Topic: My New BinChannel ERF
Replies: 13
Views: 1774

Re: My New BinChannel ERF

What is the thickness of the filter? It's designed for 40nm FWHM~ You do mean it's spectal bandwidth. I asked the thickness of the glass itself. 6mm, 10mm or 12mm ? Valery I'm sorry I don't use English very often and misunderstand your question. I need to ask another friend who will make the extens...
by ThomasHu
Wed Oct 31, 2018 12:21 am
Forum: Solar Scope Modifications
Topic: My New BinChannel ERF
Replies: 13
Views: 1774

Re: My New BinChannel ERF

40 nm FWHM in both Ca K and Ha is amazing. What far goes the blockage in IR ? 1000 nm ? 1200 nm ? Any idea of the optical quality (P-V or rms wavefront) ? 2 bands,393nm and 656nm,40nm FWHM for each. Maybe 1000 nm or 1050nm ,because I did not get any more information above 1050nm P-V I have not any ...
by ThomasHu
Tue Oct 30, 2018 12:59 pm
Forum: Solar Scope Modifications
Topic: My New BinChannel ERF
Replies: 13
Views: 1774

Re: My New BinChannel ERF

Valery wrote:
Tue Oct 30, 2018 12:03 pm
What is the thickness of the filter?

It's designed for 40nm FWHM~
by ThomasHu
Tue Oct 30, 2018 7:00 am
Forum: This is SolarChat !!
Topic: 20181030 CaH Prominences
Replies: 4
Views: 629

20181030 CaH Prominences

I tried with my 60mm f/6 EDAPO this morning. With a 2X barlow,it was suitable with the QHY5-III 174M in CaH-Quark.

It's really surprised me that there's some small proms.
10_06_00_lapl3_ap259_Drizzle15.jpg
10_06_00_lapl3_ap259_Drizzle15.jpg (579.77 KiB) Viewed 629 times
by ThomasHu
Tue Oct 30, 2018 1:17 am
Forum: Solar Scope Modifications
Topic: My New BinChannel ERF
Replies: 13
Views: 1774

Re: My New BinChannel ERF

The diameter of this ERF is 8.5 inch. It may get f/11 with my C925HD,and with a 2x barlow to use the Combo Quark.
Maybe I need to get a focal reducer with them.
by ThomasHu
Tue Oct 30, 2018 1:14 am
Forum: Solar Scope Modifications
Topic: My New BinChannel ERF
Replies: 13
Views: 1774

Re: My New BinChannel ERF

Looks good ! Any idea of the optical quality ? Any transmission curve available ? My friend told me that they choose 5 points for testing. The report shows that the coating is well-distributed.The Ha channel is about 87~90% transmission and the Ca-K/H channel about 84~85%. They made Ha-ERF for the ...
by ThomasHu
Mon Oct 29, 2018 3:31 pm
Forum: This is SolarChat !!
Topic: 20181029 Solar(HA-WL-CaH)
Replies: 5
Views: 652

20181029 Solar(HA-WL-CaH)

Sunny but a low activity day.
Photo with my new QHY5-III 174M cmos camera.
09_20_05_lapl3_ap132_Drizzle15.jpg
09_20_05_lapl3_ap132_Drizzle15.jpg (1.13 MiB) Viewed 621 times
by ThomasHu
Mon Oct 29, 2018 2:46 pm
Forum: Solar Scope Modifications
Topic: My New BinChannel ERF
Replies: 13
Views: 1774

My New BinChannel ERF

I booked a binchannel ERF from an optical engineer friend about 4 months ago. And I got my new ERF's picture this morning.It's really beautiful. The ERF was designed by 80% and above transmission near 393nm and 656nm. BinChannelERF.jpg I'm preparing to use it with a C925HD and Quark(CaH and Ha) and ...
by ThomasHu
Mon Oct 29, 2018 1:27 pm
Forum: This is SolarChat !!
Topic: Quiet Disc Today | HA | Oct 28th
Replies: 7
Views: 717

Re: Quiet Disc Today | HA | Oct 28th

And I'm interesting in which 1.5x Barlow do you use? Hello! I used a standard GSO 1.25" 2x barlow and unscrewed the lens off the barrel and screwed that lens directly onto the nose of the camera. I took two images and scaled them and it was approximately 50% the size, so I knew I was in the 1.5x ba...
by ThomasHu
Mon Oct 29, 2018 4:24 am
Forum: This is SolarChat !!
Topic: Quiet Disc Today | HA | Oct 28th
Replies: 7
Views: 717

Re: Quiet Disc Today | HA | Oct 28th

hi Marty:
Beautiful shots.
And I'm interesting in which 1.5x Barlow do you use?

Best regards,

Thomas
by ThomasHu
Thu Oct 18, 2018 4:15 am
Forum: This is SolarChat !!
Topic: 20181015-AR2724 &AR2725
Replies: 11
Views: 808

Re: 20181015-AR2724 &AR2725

Thank you all so much!!!! :)
by ThomasHu
Mon Oct 15, 2018 8:06 am
Forum: This is SolarChat !!
Topic: 20181015-AR2724 &AR2725
Replies: 11
Views: 808

Re: 20181015-AR2724 &AR2725

TheSkyBurner wrote:
Mon Oct 15, 2018 8:01 am
Nice images, is the CaH filter made by daystar?
yes,with Daystar CaH & Coronado SM60 Ha filters
by ThomasHu
Mon Oct 15, 2018 8:06 am
Forum: SPoD Archive
Topic: 20181015-AR2724 &AR2725
Replies: 5
Views: 785

Re: 20181015-AR2724 &AR2725

TheSkyBurner wrote:
Mon Oct 15, 2018 8:01 am
Nice images, is the CaH filter made by daystar?
yes,with Daystar CaH & Coronado SM60 Ha filters
by ThomasHu
Mon Oct 15, 2018 7:42 am
Forum: This is SolarChat !!
Topic: 20181015-AR2724 &AR2725
Replies: 11
Views: 808

20181015-AR2724 &AR2725

Sunspots looks like sesame seed~~~
So small...

using a 80 APO with QHY178C camera
09_09_06_lapl3_ap418_L.jpg
09_09_06_lapl3_ap418_L.jpg (494.58 KiB) Viewed 808 times
09_27_27_lapl3_ap419_L1.jpg
09_27_27_lapl3_ap419_L1.jpg (1.02 MiB) Viewed 808 times
09_44_01_lapl3_ap324_L.jpg
09_44_01_lapl3_ap324_L.jpg (541.24 KiB) Viewed 808 times
with TeleVue PM2.5x
09_13_53_lapl3_ap717_L.jpg
09_13_53_lapl3_ap717_L.jpg (775.22 KiB) Viewed 808 times
09_33_04_lapl3_ap610_L.jpg
09_33_04_lapl3_ap610_L.jpg (691.63 KiB) Viewed 808 times
09_46_12_lapl3_ap593_L.jpg
09_46_12_lapl3_ap593_L.jpg (576.08 KiB) Viewed 808 times
by ThomasHu
Mon Oct 15, 2018 7:42 am
Forum: SPoD Archive
Topic: 20181015-AR2724 &AR2725
Replies: 5
Views: 785

20181015-AR2724 &AR2725

Sunspots looks like sesame seed~~~
So small...
09_09_06_lapl3_ap418_L.jpg
09_09_06_lapl3_ap418_L.jpg (494.58 KiB) Viewed 849 times
09_27_27_lapl3_ap419_L1.jpg
09_27_27_lapl3_ap419_L1.jpg (1.02 MiB) Viewed 849 times
09_44_01_lapl3_ap324_L.jpg
09_44_01_lapl3_ap324_L.jpg (541.24 KiB) Viewed 849 times
with TeleVue PM2.5x
09_13_53_lapl3_ap717_L.jpg
09_13_53_lapl3_ap717_L.jpg (775.22 KiB) Viewed 849 times
09_33_04_lapl3_ap610_L.jpg
09_33_04_lapl3_ap610_L.jpg (691.63 KiB) Viewed 849 times
09_46_12_lapl3_ap593_L.jpg
09_46_12_lapl3_ap593_L.jpg (576.08 KiB) Viewed 849 times
by ThomasHu
Tue Sep 11, 2018 3:05 pm
Forum: This is SolarChat !!
Topic: Solar20180911(WL,Ha&CaH)
Replies: 2
Views: 448

Solar20180911(WL,Ha&CaH)

:hamster: :hamster: :hamster:
by ThomasHu
Sun Aug 26, 2018 1:33 pm
Forum: This is SolarChat !!
Topic: Alexandra’s birthday.
Replies: 11
Views: 937

Re: Alexandra’s birthday.

Happy Birthday Alexandra !:D
by ThomasHu
Sat Aug 25, 2018 11:39 am
Forum: This is SolarChat !!
Topic: 20180825 CaH & Ha solar
Replies: 3
Views: 468

20180825 CaH & Ha solar

:cool: :cool:
by ThomasHu
Sat Aug 18, 2018 8:50 am
Forum: This is SolarChat !!
Topic: 20180818 CaH solarFD and AR2718
Replies: 2
Views: 395

20180818 CaH solarFD and AR2718

There's not enough time to take ha photos this morning.
So there's CaH only. :?