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For Daystar CaH quark owners

Posted: Thu Oct 04, 2018 2:57 am
by TheSkyBurner
If you own a CaH quark from daystar, you may be in for a treat that no other solar imager can record.

Depending on where your quark is tuned from the factory, It may entirely be functioning as an FeII filter, as well as a CaH filter.

Enjoy the read, (yes i am aware the quark is 5-angstroms)
aa21439-13.pdf
(2.37 MiB) Downloaded 49 times

Re: For Daystar CaH quark owners

Posted: Thu Oct 04, 2018 4:51 pm
by marktownley
That is an interesting read Apollo, thanks. I've had a brief scan but will have a proper read over the weekend with some more time free.

Re: For Daystar CaH quark owners

Posted: Fri Oct 05, 2018 12:57 am
by p_zetner
Very much an interesting idea for “spectroheliographers” ! I’m going to be concentrating on the blue portion of the spectrum with higher spectral resolution. I’d be interested (and able) to catch these emission events. Thanks for the reference.

Cheers.
Peter

Re: For Daystar CaH quark owners

Posted: Fri Oct 05, 2018 10:34 am
by krakatoa1883
Quark is 3968.5 by factory at 0 tuning (I do not know with how much tolerance) 5A wide and max tuning range is of 0.5A both sides of CWL, may be that some redshifted units can actually be tuned on the strongest Fe(II) line although the large BP makes the device not selective. I did not noticed much difference between the extreme tuning positions but given Apollo's suggestion I will investigate this further.

Re: For Daystar CaH quark owners

Posted: Fri Oct 05, 2018 3:44 pm
by p_zetner
Just an observation that the results published in this paper were captured at a spectral resolving power of 850000 ! That’s a fwhm bandpass of about 0.005 Angstroms (5 milliAngstroms) at this spectral line. It doesn’t seem to be necessary to use such high resolving power. But, if you look at figure 1 of the paper, the Fe emission line appears to be less than 0.1 Angstroms in width. There’s no way this line can be isolated with a standard etalon filter.

Cheers.
Peter

Re: For Daystar CaH quark owners

Posted: Sun Oct 07, 2018 1:15 pm
by marktownley
Thanks for the info Peter.

One for the library me thinks!