Sunday, 15 July 2018

Ha Full Disk - 15th July

Other than the bright plage that forms the remains of ar12713 that we saw on a previous rotation the sun is essentially blank.  Possibly the old remains of ar12715 has just rounded the eastern limb and shows itself as an area of turbulent plasma split with a hair line filament at the demarcation between the bipolar fields.  There are also some small filament towards the solar poles again which seems to have been a feature of the sun this summer.  Taken with the Lunt50 etalon, Daystar Quark and IMX249 chipped camera.

Second Rotation for Ex Active Region - AR12713 - 15th July

Currently spotless and un-named as an active region, this bipolar patch of plage on the suns disk is the remains of active region which was heading towards the western limb of the sun on the 21st June.  Then it had a number of sunspots and dark filaments associated with it, whereas now it is much quieter and calmer.  It may well see a third rotation, but by then is likely nothing but a small patch of plage visible in Calcium wavelengths.  Taken with a Lunt50 etalon, Daystar Quark and an IMX249 chipped PGR camera.

Saturday, 14 July 2018

A Blank Sun? 14th July

Spaceweather says the sun is blank, there are no sunspots.  This is only partly true; it is blank in white light but in Hydrogen Alpha light there is a large active region mid disk, however there are no sunspots.  Why is this?  Well sunspots only form when the magnetic field strength is greater than 1500 gauss.  You can see in the image there are quite clear magnetic field lines in the plasma from a bipolar magnetic field with bright plage where the sunspots should be.  This is what we would expect given we are in a declining phase of the solar cycle, and scientists have been saying for some time the average magnetic field strength of the sun is also in decline.  Maybe these 'white sunspots' will be more common in the next solar cycle which is forecast to be less active than the current one.  Taken with the double stacked 50mm setup with a IMX249 chipped PGR camera.

Active Region and Prom - 14th July

A spotless active region shines brightly mid disk in this image taken with the 50mm double stack setup.  There was also a variety of nice small proms too.  The double stack cuts down continuum leakage and increases contrast making filaments and field lines pop out.

Thursday, 12 July 2018

Ha Full Disk 11th July

A virtually blank disk on wednesday, there has been the relics of an old active region that has rounded the sun on the eastern limb, and despite a small flare a day or so before it came into view there are no sunspots visible, just a region of turbulent plage.  There were a few small prominences though which were interesting to look at.

Monday, 9 July 2018

Intergranular Regions With the Daystar Sodium Quark and the Airylab HaT - 7th July

Inverting a conventional image taken with the Daystar Sodium Quark and the Airylab HaT reveals a little seen view of the sun; inter-granular regions, as the name suggests is the area between the solar granulation.  The view with a sodium Quark has much more contrast and depth than the traditional white-light view, and when inverted the region in-between the granules really pops out.  Camera used was the IMX249 chipped PGR.

Solar Granulation with The Daystar Sodium Quark and Airylab HaT - 7th July

The 203mm aperture Airylab HaT makes a good combination with the Daystar Sodium Quark as it's ERF passes the 589nm wavelength of this filter.  I shot a large number of images and chose the sharpest presented here.  The view is subtly different than whitelight (IMHO) and the image has more depth than the flatter look that is achieved of granulation in whitelight.  Camera used was the IMX249 chipped PGR camera.

Blank Full Disks - 7th July


It's not very often the sun is completely blank at both Ha and CaK wavelengths, but it was on saturday!  Nothing to see at all as can be seen in both of these full disks!