start with the key image for the weekend showing the changing
appearance of AR1339. While AR1334 moves over the edge, we now
have several new small spot groups coming onto the limb on the
left, surrounded by a large amount of photospheric faculae.
is a closer view with the 5x Barlow and Stellarvue of the western
limb. Something is amiss with that small round spot on the upper
left - it exhibits the "Wilson Effect". Lets look closer...
on the limb, a sunspot can have the appearance of a sunken umbra
- the central dark region. But we know that sunspots are essentially
flat, so how can this be?
I've rotated the image to see this effect more clearly and put
a graphic in to show the effect. This illusion is caused by changes
in the transparency of the penumbra, rather than a sunken umbra.
It can also be caused by a spot that is not really round, and
the umbra is closer to us than the center of the penumbra.
Barlow close up of the monstrous sunspot AR1339. This is when
the sunspot was at its peak and you can see plenty of light bridges
inside, usually indications of an imminent break up. The granulation
is well seen in this image as well.
(below) is a fine isolated pair, with great symmetry, and a horde
of small pores (sunspots without umbras) surrounding them. The
filaments surrounding the umbras in the penumbra are just as
difficult to image as granulation! Both average around 2 arcseconds
in width, right at the diffraction limit for this small instrument.
full disk (below) in Calcium K wavelength. The sun is always
rich with very fine detail in CaK. The white regions forming
small circles and rings in the faculae, which are surround the
outer edges of the so called "Super Granulation" which
is best seen at this wavelength.
( below) is stunning in CaK. This two part lower magnification
image also shows a very nice spot group coming onto the limb
on the left. Seeing was not so sharp at this wavelength! The
farther you get in to the UV end of the spectrum, the seeing
and steadiness decreases dramatically. Alternately, it is best
in red wavelengths such as Halpha.
( below) in CaK with the 5x Televue Powermate. What a monstrous
sunspot! Although not quite as sharp as the G band white light
image, the extensive detail in the faculae - the white areas
around the spot are priceless.
to the limb in H-alpha wavelengths. (deep red) This huge spot
group has a very different appearance in H alpha. It is flaring
a bit here, the white areas are the small C class flares. On
the limb we can see some filaments, which are prominences viewed
against the solar disk. The seeing had really gotten bad by now,
but at least we can see something.
is a shot inside the observatory while imaging the Sun. The roof
is rolled back, and the Astrophysics 1200 mount carries a equipment
mounting board with the SV80s on the left imaging the sun in
the Green band, a 6" Schmidt Newtonian in the center, and
some counterweights on the right.