Another session with this wonderful solar region. Today I tried to gain a bit of resolution by using a green filter instead of the red one. The seeing was good in red, but the lower wavelengths were a bit difficult. Nevertheless, some improvement is observable, when compared with the previous sessions.

200mm F/5 Newtonian, Full aperture Astrosolar filter, Baader Green CCD filter, ASI 174MM. Scope working at F/25 and F/35. Seeing 4-5/10 (in green), 6-7/10 (in red).

10 08 ut color.jpg

10 08 ut bw.jpg

07 16 ut color.jpg

07 16 ut bw.jpg

Also, some H-alpha images of this group, for now a comparison between two shots acquired at four hours from each other. Structural changes inside the group are observable, as is the apparent change in position, due to the rotation of the Sun.

AR 2673 H ALPHA FOUR HOURS.jpg

An animation showing the activity of this region in H-alpha. The animation shows changes over 40 minutes starting at 11:03 U.T. Note the rotation of the Sun, as the limb gets lower in the frames. A few small flares occur during the image sequence. Note also the “grass in the wind” effect of the solar surface.

ar2673Sept7.gif

These two groups (AR 2673 and AR 2674), at the time I write this, are two-three days from re-emerging at the solar limb, after a two-week journey. The next free astro show is about to begin!

TwoARs.jpg

And something interesting that I’ve found after reprocessing the above animation: penumbral waves!!

More about the subject may be found here.

And a reprocessed animation, with some arrows pointing to the location of the waves in the penumbra of the two main spots in AR2673:

waves.gif

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

%d bloggers like this: