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Old 28-01-2019, 11:04 PM
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Ukastronomer (Jeremy)
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Ha, Sun granulation ????

Is it my eyesight, or do you only see granulation in "images"

IF we EVER get any Sun in Wales (UK) I will set my scope up, finally, using my mono camera, what I can never understand is that with a PST I never "saw" granulation, now with a (only used twice due to British weather) daystar, I still don't (see) granulation.

Thanks
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Old 29-01-2019, 06:17 AM
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Merlin66 (Ken)
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Jeremy,
Solar granulation is a White light feature. These convection cells are about 1 arc sec in size and generally need an aperture > 100mm and good seeing.

Not visible in Ha.
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Old 29-01-2019, 09:50 AM
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h0ughy (David)
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Quote:
Originally Posted by Merlin66 View Post
Jeremy,
Solar granulation is a White light feature. These convection cells are about 1 arc sec in size and generally need an aperture > 100mm and good seeing.

Not visible in Ha.
To add to that https://www.skyandtelescope.com/obse...-nearest-star/
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Old 29-01-2019, 08:00 PM
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Ukastronomer (Jeremy)
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Old 02-02-2019, 07:11 AM
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I think I understand what you're asking. I have a PST which is quite small compared to your Ed72 setup and I can see surface detail in Ha, albeit, not to the extent seen through a cam as the disk is quite small with the eyepieces I have.

I do have one question which may be related. Does it really matter so much if I image solar Ha from an inner city location compared to a more rural setting? Will this have an effect on disk surface detail visibility?
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Old 02-02-2019, 08:50 AM
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Merlin66 (Ken)
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For solar observing (and imaging) seeing is King!!!!!!
The better the seeing conditions, the better the results.
I find early morning, away from concrete surfaces, steady conditions are the best for me.
I'm limited by the conditions down here at the coast (only 25mtr above the sea, and 500mtr from the beach)
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Old 02-02-2019, 07:37 PM
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Ukastronomer (Jeremy)
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Thank you
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