Re: ATM spectrohelioscope (was bounced ...)

["Chris Westland" <westland@uxmail.ust.hk>]

 I have a great book by Phillips called "Guide to the Sun" which covers the
various lines ... H-alpha and Ca-K lines are the main visible lines, H-alpha
shows the prominances ... the idea ov being able to tune in a frequency is
very enticing.  I may eventually build one of these.

-c

-----Original Message-----
From: Suzanne Sarlette/Gerald Pearson <suegerry@mut1.muscanet.com>
To: Chris Westland <westland@uxmail.ust.hk>
Cc: atm@shore.net <atm@shore.net>
Date: Friday, September 12, 1997 1:07 PM
Subject: ATM spectrohelioscope (was bounced ...)



>Chris,
>
>> >
>> >The solar scope build & run by the Rockford Astronomy Club (Rockford,
>> >Illinois, USA) _can_ be run in spectrohelioscope mode, but I understand
>> >that it very seldom is.
>>
>> Any idea why ... no interest or is there not that much to see on the
>> spectrohelioscope?
>
>I'm not sure, but my guess is that it might be a pain in the butt to
>switch over from normal projection (or spectroscopy) to
>spectrohelioscope and back again.  And anything that requires an extra
>half hour or hour is -- in practice -- going to be avoided.
>
>I would think that a spectrohelioscope would be a neat thing to have.  I
>think it would be roughly equivalent to having about a dozen different
>Daystar interference filters which you can swap into your scope as
>desired.  Not only can you select the H alpha line to watch stuff, but
>there are _other_ wavelengths that show _other_ features.  I'm not
>familiar with the details, but I do know that one of the calcium lines
>brings out features which are not apparent in either H alpha or white
>light.  I would expect that even playing around with the H alpha
>bandwidth would allow you to fish out features which might be difficult
>or impossible to detect with a given Daystar interference filter.
>
> -- Gerry
>