Solar H-Alpha: MAY 3, 2009 - 18:30 UT

Solar H-Alpha Sketch - MAY 03, 2009 - 18:30 UT

H-Alpha Solar Sketch

Move mouse over sketch above to view labels
Click image for larger version.

Observation Notes:

The solar limb extruded a fantastic prominence today at PA 210 degrees. It took the shape of a calligrapher's X, or perhaps something like a Cretaceous claw reaching over from the Sun's far side. I measured it at 1.3/31.2 solar diameters in height, or 58,000 km (36,000 miles). It's pretty awesome to consider 5 earths could be stacked along its length. Several other gouts of plasma levitated over the solar limb. One in particular at about PA 220 degrees looked like it might form a loop with two bright spots beneath it; however I was only able to spot a brighter segment of the arc. The limb otherwise steadied enough at times to give the impression of sharp, faint, thorny protrusions everywhere. These can't be spicules, so I need to figure out what they actually are.

Edit - MAY 04, 2005: Alan Friedman posted images he shot of the same prominence at the same time I was making this observation. So I was able to get some photoglaphic feedback on the sketch:

Comparison photograph and sketch of solar prominence - MAY 3, 2009 - 18:45 UT
Comparison of photographic and visual sketch of prominence
MAY 3, 2009 - 18:45 UT
Photo posted with permission of Alan Friedman.

I obviously didn't catch the finer detail, but the broad details seem to match up fairly well. Be sure to have a look at the excellent astrophotography at Alan's site: Averted Imagination.

SubjectSolar H-Alpha
Sunspot Groups0
Date/TimeMAY 03, 2009 11:30 - 11:50 AM MST
(MAY 03, 2009 18:30 - 18:50 UT
Observing Loc.Flagstaff, AZ - Home
InstrumentCoronado PST - 40 mm f/10
Eyepieces/Mag.Pentax XW 10 (40X); Meade Astrometric Eyepiece (33X)
ConditionsFew Clouds, Breezy
SeeingAnt. III

The Cerulean Arc

My weblog for
everything else non-astronomy

Pin at will!

(Thanks for maintaining
return links.)

About this Entry

This page contains a single entry by Jeremy Perez published on May 3, 2009 1:38 PM.

Messier 49 (NGC 4472) was the previous entry in this blog.

Messier 99 (NGC 4254) is the next entry in this blog.

Find recent content on the main index or look in the archives to find all content.


Monthly Archives

Powered by Movable Type 5.2.3