Tuesday, 19 September 2017

A Wolf in Sheep Clothing - 19th September

Just 2 weeks ago we had the largest solar flare for a decade and large active regions keeping solar observers pleasantly occupied in the declining phase of the solar cycle.  Now the face of the sun is virtually blank in white light, with only one small decaying active region.  You would be mistaken in thinking this means the sun is quiet; looking in ultra violet wavelengths with the Solar Dynamics Observatories AIA imaging rig reveals a large coronal hole is visible. These are the dark patches on the solar disk on the right, and their open magnetic field lines means that the solar wind flows freely from these regions.  As they are geo-effective it means the solar wind has been interacting with the magnetic field lines of our own planet and has been producing some great aurora in our polar regions.  It just shows that just because the sun might appear quiet in white light it doesn't mean it is actually being quiet!

Tuesday, 5 September 2017

New Active Regions - 5th September

Things have been busy of late not leaving much time for solar observing or updates to my website.  I have been out in the States on holiday to observe the total solar eclipse.  I've got a lot of pictures which at the moment i'm working through processing, initial results are promising and i'm working on an animation of the whole event along with a report.  In the mean time our star is showing a pleasing amount of activity with active large sunspot genesis with large flares.  This is a result of Band - Band interaction (after McIntosh et al) where bands of deep magnetic flux associated with the declining phase of the solar cycle get ever closer at lower latitudes towards the solar equator.  These bands have opposite magnetic polarity, opposite helicity, and, because they are in different hemispheres different Coriolis forces.  As a result of all these opposing factors we should anticipate that we have dynamic, fast forming and potentially violent active regions.  Which, is exactly what we see at the moment.  Incidentally, when you consider the Carrington event in 1859 this happened in the declining phase of solar cycle 10, at exactly the same point we are no in cycle 24, maybe we will get a repeat event this cycle?  Certainly worth looking out for!

Wednesday, 16 August 2017

AR12671 in Ha - 15th August

A new active region coming around the limb with plenty of small flaring activity.  The 203mm Airylab HaT was used but a mobile westerly air stream meant the seeing was never going to be the best.  I took a number of images and this one was the best of the bunch.  I was out early to observe and was surprised how much later the sun was now starting to rise as I realised we are closer to the autumn equinox than the summer solstice - seasons a changing!  

Thursday, 10 August 2017

AR12670 in Ha - 10th August

It's getting near that time of year when only the best days are suitable for the large aperture of the 8" Airylab HaT here in Brierley Hills.  Despite taking some number of images this is the best one of the bunch and shows this decaying active region.  It should be on the limb this weekend so fingers crossed will put on more of a show.  Taken with the double stacked Quark at ~6m focal length with the PGR Chameleon 3 camera.

Sunday, 6 August 2017

CaK Full Disk - 6th August

A clear if somewhat hazy morning today meant any solar imaging was going to be limited to the shorter focal lengths.  In the end it was a flat battery on the mount that brought an abrupt end to the session - a timely lesson in preparation!  Still, despite no power I was able to let the solar disk drift across the chip of the PGR Chameleon 3 camera to get this full disk in Calcium light with the 40mm scope at 560mm focal length and the home brew CaK filter.  The large spot associated with AR12670 should still be around for next weekend when it is the annual Solarsphere festival in Builth Wells. 

Saturday, 5 August 2017

Old Active Regions Around Again - 31st July

Been away for a week or so, excuse being late in posting this up here, but finally got round to getting this animation processed.  Following a 2 week journey around the sun old active region AR12265 announced its return with a bright but dynamic prominence structure on the eastern limb as magnetic fields swirled around great waves of plasma.  For once this summer the sky had some clear breaks and I was able to get a view in.  The seeing was falling, but the view through the 8" Airylab HaT revealed the subtle changes in structure over the period of this 8 minute animation. The double stacked Daystar Quark was used with the PGR Chameleon 3 recording a cadence of 4 frames a minute for the animation.  Fingers crossed some clear skies return soon so that I can see what remains of it on the face of the sun.

Friday, 28 July 2017

CaK Full Disk 28th July

So far this summer i've been really unlucky with solar observing, either the weather has been bad or i've been tied up with work.  This morning there was some brief and unexpected clear skies so I managed a quick full disk in calcium wavelengths.  The sun is very quiet at the moment with no sunspots and only a couple of areas of plage.  Taken with the 40mm scope at 560mm focal length with the home brew CaK filter and the PGR Chameleon 3 camera.

Saturday, 8 July 2017

6 Minutes in the Life of AR12665 - 8th July

The seeing was just about holding up for the 100mm of aperture of the Tal100R refractor this morning so I decided to go for an animation to see what this active region was up to.  This is just over 6 minute real time - before the clouds came back! with a cadence of 4 images a minute revealing just how quickly things change on our star.  Using a double stacked Daystar Quark and a 0.7x Baader solar telecompressor brought the focal length to a manageable 3 metres.  Using a PGR Chameleon 3 camera with 2x2 binning meant short exposure (3ms) times were possible to tame the seeing.

AR12665 With HaT in Poor Seeing - 8th July

I started off imaging with the 203mm Airylab HaT this morning, but the seeing was awful, and after shooting about 20 file runs this really was the best of them (and it's not very good!), so rather than pursuing this fruitless avenue I decided to back off to the 100mm scope instead.

Glorious Proms - 8th July

A lovely great big prominence visible this morning on the suns eastern limb.  Normally I don't both imaging proms but this one was too much to miss out on.  Taken with the Tal100R refractor at ~3000mm focal length with the Double stacked Daystar Quark and PGR Chameleon 3 camera using 2x2 binning.

Cak Full Disk 8th July

The sun is quiet at the moment bar the large single active region with multiple spots.  The seeing had really gone bad when this shot was taken, so much that I was only able to shoot at 400mm focal length with the 40mm scope using the home brew CaK filter and the PGR Chameleon 3 camera.

Growing Sunspots - AR12665

This active region has been growing quite quickly since rounding the limb a few days ago, as seen in this animation over 36 hours of SDO data.  So far it has not shown any signs of flaring, but hopefully this will change in the days ahead!

Thursday, 6 July 2017

New Active Region Rounding The Limb - 5th July

Despite having to shoot through haze and ramp the exposure up, it was very easy to see just how dynamic this crown of plasma was as it spitted and changed form in real time on the laptop screen.  Since seeing it yesterday morning it is apparent there is a large single spot associated with it.  I needed to take a lot of images to find a best one, as the seeing and transparency weren't great, but, this came out ok.  Taken with the 203mm  Airylab HaT at ~6m focal length with the Double stacked Daystar Quark and the PGR Chameleon 3 camera using 2x2 binning.

The Scars of Spots Long Gone - 5th July

This may seem a fairly insignificant bit of the sun, but with its plage and filamentary structures marking magnetic fields, this area is the relic cores of some of the active regions that we have seen in the past couple of months.  The seeing wasn't great but shooting enough data and lucky imaging meant I was able to recover something usable.  Taken with the 0.2m Airylab HaT, the double stacked daystar Quark at ~6m focal length with a PGR Chameleon 3 camera with 2x2 binning.

Saturday, 24 June 2017

CaK Full Disk - 24th June

An unexpected break in the clouds first thing allowed me to grab a quick CaK full disk this morning on a day when the forecast was for wall to wall clouds.  The seeing was really bad though, and even with the 40mm scope it was difficult to see sharp focus, I did briefly try with the 80mm to get a closer view of the spot, but I was wasting my time.  This was shot at 500mm focal length with the home brew CaK filter and the PGR Chameleon 3 camera.

Monday, 19 June 2017

AR12662 with the Airylab HaT - 18th June

This is my favourite image from the weekend and also one of the sharpest, taken with the 203mm Airylab HaT at a focal length of 7 metres, it is really starting to pull in some of the finer details caused by the magnetic field lines and their influence on the electrically charged plasma.  Taken with the double stacked Daystar Quark and Baader 0.7x solar telecompressor and the PGR Chameleon 3 camera using 2x2 binning to get 6.9um pixels and a short 3ms exposure time, which coupled with the 120fps capture rate works well in it's efforts to freeze the seeing.  

AR12663 with the Airylab HaT - 18th June

This angry little active region has been crackling with a number of smaller spots between the main bipolar group with many lines of swirling plasma molded by magnetic field lines.  Taken with the 0.2m Airylab HaT at 7m focal length using the double stacked Daystar Quark and PGR Chameleon 3 camera.

Plage with the Hat - 18th June

This region is typical of the sort of small scale features on a quiet sun that can be seen with the 8" Airylab HaT; with a regular size scope there would be little to see, but at nearly 7m focal length there is quite a bit.  The seeing was starting to go here, but this just about works.

Dark Filament - 18th June

This filament looked particularly dark on sundays sun, and I was pleasantly surprised when I looked at the final image the subtle detail that had been recorded.  The seeing must have been behaving at that point!  Taken with the 100mm Tal100R, Double stacked Quark running at f43, and a Baader 0.7x solar telecompressor to bring the focal length back to a more usable 3 metres.  The camera was the PGR Chameleon 3 using 2x2 binning to get a shorter exposure and larger pixels more suited to the focal length.

Active Regions with the Tal100R - 18th June

The 100mm Tal100R was putting on a good show with sundays solar activity as the heat of the day became too much for the seeing for the Airylab HaT, and with the wider field of view and lower resolution the resultant images were still nice and sharp.  There was lots to see, and with an f43 beam entering the double stacked daystar quark the contrast was high.  A nice set of images that I am pleased with!

Sunday, 18 June 2017

CaK Full Disk 18th June

With temperatures up at 28c when I took this picture, the 40mm scope was all I was going to be able to use in the midday heat with the seeing conditions boiling away.  Fortunately this scope is impervious to all but the worst the atmosphere can throw at it, and, as a result I got a nice disk - 3 days in a row - surely a UK record 😆  Either way, at 500mm focal length and with the home brew CaK filter together with the PGR Chameleon 3 camera I got a nice full disk I thought!

AR12663 in Ha - 17th June

This is only quite a small region on the sun, 'merely' a dozen or so Earths across, but with the 0.2m Airylab HaT at nearly 9 metres focal length it is possible to get up close and personal with this tempest of plasma.  The image was taken shortly after 6am before the heat of the day destroyed the seeing conditions.  The sun looks angry and menacing at this scale.  The double stacked Daystar Quark was used along with the PGR Chameleon 3 with 2x2 binning to give nice large 6.9um pixels, 3 ms exposure time and a 120fps frame rate in an attempt to get the best out of the seeing conditions.

AR12662 in Ha with the Airylab HaT - 17th June

These 2 shots were both taken with the Airylab Hat, double stacked Quark, and PGR Chameleon 3 with 2x2 binning, the only difference being the wider field view used the Baader 0.7x solar telecompressor to give an effective focal length of just over 6 metres compared to the native focal length of nearly 9 metres using the quarks 4.3x telecentric instead of the Airlylab 2.7x telecentric.  The seeing wasn't perfect at this scale but it was good enough to get a couple of acceptable images.

Solar Activity in Ha with the Tal100R Refractor - 17th June

I have found a bit of an unusual setup that I quite like in this years solar season; my trusty 100mm Tal100R refractor works particularly well when my double stacked Daystar Quark is used in conjunction with the 0.7x Baader solar telecompressor and the PGR Chameleon 3 camera with 2x2 binning.  This unlikely combination delivers a f43 beam into the etalons for a contrast rich view, the solar telecompressor then brings this back to a more manageable 3 metres focal length, which on days when the seeing is too bad for the 0.2m Airylab HaT gives some nice views.  Our star was looking very fiery with this setup on saturday.

Ha Full Disk - 17th June

In the absence of an 'in one' full disk setup that i'm currently happy with it means it has been a while since I got an overview of our star at 656nm.  Saturday offered plentiful clear skies with minimal haze (this can be seen as a 'glow' around the suns limb in places) and so I took the opportunity to use the 56mm scope, double stacked quark, baader solar telecompressor (0.7x) and the PGR Chameleon 3 with 2x2 binning to get this mosaic.  It's reasonably large so is worth a double click on the image to see it in full size.

AR12663 in CaK - 17th June

This is by far the most active region on the sun at the moment, with it's trailing wake of plage.  There were just about some nice details visible in this shot taken with the 100mm Tal100R stopped down to 80mm using a Beloptik Tri-Band ERF, home brew CaK filter and the PGR Chameleon 3 camera.

AR12662 in CaK - 17th June

A couple of shots of this solitary spot and its associated active region taken with the 100mm Tal100R telescope stopped down to 80mm with the Beloptik tri-band, and, using the home brew CaK filter and the PGR Chameleon 3 camera.  On one of the hottest days of the year so far seeing was deteriorating quickly and so was not able to try larger apertures in these short wavelengths.

CaK Full Disk - 17th June

Considering we are heading towards solar minimum there is still a pleasant amount of activity visible on our star!  Taken with the 40mm scope at 500mm focal length with the homebrew CaK filter and the PGR Chameleon 3 camera.

Friday, 16 June 2017

CaK Full Disk - 16th June

Finally some sun!  Work has been manic lately, and the morning skies whilst clear at 5am seem to have clouded up by 7am not leaving a big window for imaging.  Today there was high cloud and the transparency wasn't great but the seeing with small apertures was OK.  This was taken with the 40mm scope at 500mm focal length with the home brew CaK filter and the PGR Chameleon 3 camera.  Nice to see a bit of activity on the suns disk too!  Hoping to get a bit more chance for imaging over the weekend, forecast is allegedly good!  

Sunday, 4 June 2017

AR12661 in Ha - 4th June

This active region that has rotated into view only recently spewed off a near M class flare in the hours preceding this image being taken and looked to be very lively at the time, with lots of swirling plasma, and, in this image taken with the double stack system the sunspot itself virtually hidden as a photospheric feature.  The seeing was variable in the rapidly bubbling up cloud in an unstable atmosphere, and I took several shots with this one coming out the best.  The 203mm Airylab HaT was used, along with a Double Stacked Daystar Quark, a Baader solar Telecompressor to bring the focal length down to about 4250mm.  The PGR Chameleon 3 was used with 2x2 binning to give effective 6.9um pixels, short 3ms exposure and 120fps with the latest version of firecapture.