Solar Activity 17 May

[brianb]

Another frustrating day with much drifting cloud (& a couple of light showers) but it did clear for long enough to complete observations.

The Sun remains quiet; white light blank, not much showing in CaK either.

1046 UT. Coronado PST CaK, prime focus, DMK41

The most interesting activity on the disc is at the north east limb. CaK doesn't show much

1051 UT. Lunt 60mm, B1200 CaK diagonal, x2 barlow, DMK21

but in Ha there is a most interesting feature which looks like a worm crawling across the surface!

1222 UT. Solarscope 60, x2 barlow, DMK21

This no longer shows up much against the limb

1224 UT. Solarscope 60, x2 barlow, DMK21

A more active bunch of prominences appears at the SW limb

1227 UT. Solarscope 60, x2 barlow, DMK21

but the most significant prominence activity is around the west limb

1254 UT. Solarscope 60, x2 barlow, DMK41

Transparency good between drifting shower cloud. Seeing poor with significant boiling & some smearing. Temperature 16C, wind NW force 1-2.