The Sun 29 September 2011 white light

[Bizibilder]

Today's Sunny Pics: Good seeing but VERY low when I got home from work!

[markt]

Excellent! I was sooooo close to having a go at some CaK and WL shots today but are busy atm, and with a backlog of avis already decided against it (wish I had now!)

[Dave Smith]

That is an impressive set of sunspots.

Dave

[Montana]

Excellent pictures and presentation!

Hopefully I will get some WL imaging in this weekend.

Alexandra

[Montana]

Congratulations in being mentioned in the picture of the week

Alexandra

[Bizibilder]

Thank you - I was quite chuffed myself!

[duncan.p]

Great photos; any chance of some info on the equipment used please including details of the photos - no of frames, exposure etc. Thanks

[listy]

Any idea how big the sunspots are?

[Macavity]

Splendid images!

Any idea how big the sunspots are?

The sun is about 100x the diameter of the earth. If you imagine a small black dot superimposed on the disk...

About the same size as AR1305, by my [quick] school ruler technique?

[Bizibilder]

Duncan.p The equipment is as follows:

For the full disc image-

Skywatcher Evostar 120 achromatic refractor stopped to 100mm with a Baader solar filter (homemade from a ventilation pipe fitting, card and sticky tape!).

Canon 1000D dslr camera (unmodded).

HEQ5 mount, motorised but unguided on a pier in my observatory.

For the close-ups-

As above but the camera was a Philips SPC900 webcam (from Morgans Computers) and a 2x barlow.

The full disc pictures were all from a stack of 64 JPEG's at ISO100 and 1/1600sec.

Each close up image was an .avi of 4 minutes duration at 10 fps (= 2400 frames around 1000 of which were used in the stack).

Both were stacked in Registax5 and processed with a touch of false colour in Photoshop CS5.

Long & Lat lines kindly provided by "Tilting Sun" freeware (who I regularly forget to acknowledge!!).

Listy - there is a "little Earth" in the top right corner of the annotated full disc to show the size of the Earth.

Hope this helps.

[listy]

oh my... thats mind blowing!

[duncan.p]

Many thanks for the info - I'm at the bottom of the learning curve so need every bit of help I can get.

Brgds.

[sheri_barri]

Very mice work!! The presentation is spot on!