This animation was made at 70 second intervals with the Lunt 100 on 26 April 2013 from 1840-1929 UT. It shows AR 1726 on the solar limb as it rotates out of view. The massive sunspot put on a spectacular display during the month of April. The movie displays modest activity at 0.7 angstroms. The exposure was set to capture limb details without washing out the disc, and results did not record faint prominence activity. The SDO movie shows quite a bit of action that was not recorded in the Ha movie. But the AR can be seen as a malstrom of boiling hot plasma with the lunt 100, and it waves goodbye with a fine display.
A movie showing an emerging flux region near the center of the disc and it shows action typical of an emerging magnetic flux tube poking through the solar atmosphere, and an arc filament system has developed. The disc movie was made at 70 second intervals with the Lunt 100 on 26 April from 1958-2049
Here is the magnetogram from the SDO website on 26 Apr 2013, showing the polarity of the flux region
These movies were made with the Lunt 100.
This solar filament was captured at 1 minute intervals on November 22, 2012. The single stacked, 0.7 ang Lunt 100 delivered a rich, detailed view of motion within the filament, with plasma moving along thin flux bundles. Filament anchor points are also evident.
This movie was made at 1 minute intervals on 13 Nov 2012. It shows AR1609/1610. It shows plasma outflow from the edge of a sunspot penumbra.Plasma flow near sunspots and active regions can be very complex, with inflow and outflow occurring at the same time in multiple areas. The movie was made with a Cemax Barlow screwed into the end of the DMK. I normally use a Televue Powermate 2.5x, but seeing was poor, so backing off on the FL produced frames that were less mushy
This movie shows AR1618 captured at 1 minute intervals on 21 Nov 2012 from 2009-2218 UT. The plasma within active region filaments and fibrils is moving at high speed. Several small subflares pop, as well as a small C class flare. Plasma inside solar filaments can move at speeds
of 40 miles per second.
AR mag fields indicate AR1618 is classed as a Delta magnetic field that has the potential to erupt with awesome power.
This large prominence was visible on the western solar limb on 6 Nov 2012. The feature was captured at 1 minute intervals using a Lunt 100T Ha solar telescope from 1813-1936 UT. A huge cloud of plasma suspended in the corona shows helical plasma motion as well as faint, thread-like bundles of flux tubes that connect the large plasma cloud to the chromoshere. These threads appear to be aligned with the local magnetic field and do not show helical motion, but show plasma flowing downward from the cloud. It is interesting to note that the neutral line, or polarity inversion line, is really an area of mixed polarity. Prominences have weak magnetic fields of only 3-15 Gauss and several models for prominence magnetic fields exist. Typically, temperatures in a prominence/filament range from 8500-14000 F. Plasma can race around at 3 miles per second
These 2 papers summarizes our current understanding of solar prominences and provides several models for thier structure and movement. They makes great reading on a cloudy day and can be found with a simple internet search
Physics of Solar Prominences: II – Magnetic Structure and Dynamics by D.H. Mackay,· J.T. Karpen · J.L.Ballester · B. Schmieder · G. Aulanier
New perspectives on Solar prominences by B Schmieder
This spectacular neutral line filament was captured at 1 minute intervals on 28 Oct 2012 from 1810-1910 UT with a Lunt 100T. The giff shows the SDO magnetogram overlaid on the GONG Ha for 28 Oct. Note how the filament snakes its way along a magnetic inversion line that stretches to the limb and is visible in emission as a prominence. A small subflare can be seen as it erupts and displaces plasma along the line, which quickly reforms. This movie also provides an interesting view of the feature. The area closer to the center of the solar disc appears quite dark and dense, and near/on the limb the feature appears diffuse. This is due our view looking down the filament near the center of the disc, and through the filament profile as it appears on /near the limb. The movie was made to expose the disc and the plasma on the limb is very faint, but is quite visible in the lower left quadrant of the disc in the Ha-magnetogram giff (please click on the image to download the giff files if they do not open automaticaly after a moment).
This short movie was made from 2020-2110 UT on 3 October 2012. It shows AR1585 shortly after it rotated into view. The area of plage shows a modest amount of activity, with boiling plasma and fibrils. The sunspot exhibits quite a bit of plasma flow. This movie was made at 1 minute intervals with the Lunt 100 and a DMK 21AU04 operated with Lucam Recorder.
Although it requires more processing than longer interval movies, I prefer a 1 minute interval for solar features because it creates a nice, smooth movie. Frames with poor alignment or mushy from poor seeing can be dropped from the final movie without a noticeable skip (provided not too many frames are removed). On occasion I will use a 2 minute interval for long duration events
Active Region 11560 has morphed into the most prominent magnetic feature facing earth on the solar disc. A comparison with observations made on 2 Sept 2012 reveal interesting changes. The small pores in the center area have joined together to create a giant area of magnitisim. A magnetogram dated 2 Sept shows an increase in magnetism with a large dark core. The lower right portion also shows change with less plasma flow, and increased elongation of a dark area. The magnetogram shows the elongation of the mag field as well. Magnetic activity seems to be consolidating on the lower spot, the same area that exhibited massive plasma flow 24 hours earlier. But note how subflares occur in the same area just left from the lower spot.
Most sunspot magnetic fields have a strength of 2000-3000 Gauss. How powerful is that? For reference, a typical stereo speaker magnet measures 10,000-24,000, much higher than a typical sunspot (interesting fact: it takes 160k Gauss to levitate a frog). Recent research shows field lines protrude from the dark sunspot cores
The movie below shows AR1560 captured at 1 minute intervals on 1 Sept 2012 from 1754-1932 UT. Please click on the image to launch the giff. The Wilson classification for this area is beta gamma/ beta gamma, or both spots show no apparent north-south inversion line.
This active areawas sizzling with minor subflares and exhibits interesting plasma flow when compared to this magnetogram from 1 Sept 2012 .
Note the large amount of plasma flow from the poles. Both poles show inflow and outflow of material. An emerging flux region may showing itself with the line of dipoles that extend upward from the center. That region shows low fibrils connecting the poles and massive flow connected with the proceeding spot. A subflare is seen flashing in the faint light area (weak magnetic field?) just below the dark pole of the proceeding spot.
The second movie (click on the image above) showsthe magnetogram overlaid on the AR. With these animations and a magnetogram, we can study the
plasma flow as it relates to polarity