[RTTY] Solar Flux Index 298

[Ekki Plicht]

Am Mo Oktober 27 2003 00:57 schrieb ka3hsw at earthlink.net:
> On 26 Oct 2003 at 15:25, Bill Turner wrote:
> > It always amazes me that the sun, which is just a ball of gas, has
> > such sharp edges.
> > Do I need to get out more often?  :-)
>
> I believe that it is typically photographed with a mask, to eliminate the
> corona from the picture, and also to minimize flare light in the
> photograph.

No, this is how the sun appears in such a telescope. Of course a filter is 
used, but only for attenuation. The corona is invisible because the disc is 
much brighter than the corona.

Nice pictures, anyway.

73,
Ekki, DF4OR