Solar Activity 25 May

[brianb]

Apologies for late posting. I've been more or less down with severe migraine for a couple of days & haven't been able to work on the computer for more than a few minutes at a time as a consequence.

May 25 - another day with a cloudy start, this time clearing mid morning. Conditions quite good but with some interference from thin patchy high cloud at times.

The Sun's activity is declining again. The main area of activity on the disc, AR 11072, is now declining; the main (preceding) spot remains large but the mass of small following spotlets is fading rapidly. Hydrogen alpha images also give the impression that this active area is "tiring".

1042 UT. Solarscope 60, x4 Imagemate, DMK21

1056 UT. FLT 110, Lunt solar wedge, 4x Imagemate, DMK21

1107 UT. FLT 110, Lunt B1200 CaK diagonal, 4x Imagemate, DMK21

There is however a new active area practically on the SW limb, a bipolar spot group showing some evidence of the "Wilson Effect":

1044 UT. Solarscope 60, x4 Imagemate, DMK21

1053 UT. FLT 110, Lunt solar wedge, 4x Imagemate, DMK21

The prominence group on the NW limb is declining

1034 UT. Solarscope 60, 2x barlow, DMK21

but there is an interesting bunch of filaments & a prominence a little further round the limb to its south

1033 UT. Solarscope 60, 2x barlow, DMK21 (seperate disc & prom images)

There is also a large, complex but faint & diffuse prominence on the SW limb

1036 UT. Solarscope 60, 2x barlow, DMK21

The CaK overview shows that the line of "froth" in the northern hemisphere is almost complete but that none of it is significantly active:

1015 UT. Coronado PST CaK, prime focus, DMK41

Transparency mostly very good but with some drifting cirrus cloud. Seeing moderate with significant boiling. Temperature 14C, wind NE force 3-4 gusting 5 and causing some wind vibration.

[Merlin66]

Once again some excellent images!

A good, complete coverage of the solar activity in white light, Cak and Ha.

The seeing must have been pretty good to be able to use the x4 on the 60mm.

Well done!

Ken

[kev]

Twas really hazy up here that couple o days. Sunny now but the sky is still white rather than blue. Great images!