Society for Popular Astronomy

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Author:  RMSteele [ Mon Apr 08, 2019 12:35 am ]
Post subject:  Sunspot

An interestingly largish spot has appeared, very foreshorted, near the following limb. Observed by projection in white light, 0025 Ut on March 08, 80mm refractor, f5, x2 Barlow, 10 mm eyepiece. Seeing 2, transparency 3 hazy. Melbourne Australia. Kind regards, Bob

Author:  Cliff [ Mon Apr 08, 2019 6:56 pm ]
Post subject:  Re: Sunspot

Nice one! I'm pleased you are still enjoying yourself down under.
I managed to see the fine Sunspot myself today - but a bit later than you and of course your day began before mine anyway. I couldn't help wondering if the Sunspot might have "just" been visible from Earth yesterday on the edge of the Limb - but as it happens although I observed & imaged on the 6th April, it was cloudy here yesterday so no Sun for me then.
Anyway for what its worth, I now attach my two Ha & one White Light images taken today.
Best wishes from Cliff

zyxSun20190408_1702UTmeredith_43R.jpg [ 68.69 KiB | Viewed 2180 times ]
zyxSun20190408_1529UTmeredith_48R.jpg [ 67.2 KiB | Viewed 2180 times ]
zyxSun20190408_1515UTmeredith_19R.jpg [ 77.19 KiB | Viewed 2180 times ]

Author:  RMSteele [ Tue Apr 09, 2019 12:33 am ]
Post subject:  Re: Sunspot

Hello Cliff, thanks for posting the images. You are quick off the mark and I’m glad the weather allowed you to get a look at this one. For some reason I couldn’t observe on the 6th or I might have caught it right on the limb. Today (actually early hours for UK) 0010 UT the spot is magnificent, with a lobate umbra, and trailing a web of faculae with two or three (suspected) tiny spots and pores. I wonder if we’ll get more spots and flares and aurorae as it crosses the disc. Kind thoughts Bob

Author:  Cliff [ Tue Apr 09, 2019 7:18 pm ]
Post subject:  Re: Sunspot

First, I must apologise to all & everyone else, for posting my images in the observing section of the forum. But, yes, this quite big Sunspot is a pleasure to see. A friend has suggested the position of the new Sunspot might be an indication of the start of a new Solar Cycle. If it actually is, it makes it an even more dramatic event (?).
Whatever, I managed to do some more Sun observing & imaging today - so but I'll display them on the Gallery this time.
Best wishes from Cliff

Author:  David Frydman [ Fri Apr 12, 2019 10:17 am ]
Post subject:  Re: Sunspot

2019 April 12 07.55UT.
Bright sun.

Sunspot seen unaided eyes distance glasses plus safe filter.
10 o'clock position about half way centre disc to edge.
Estimate 48 arcsecond penumbral diameter.


Measuring a photo gives about 57 arcsecond penumbral size.
However, the penumbra is large and the umbra much smaller.
This may account for my low size estimate, as the sunspot is not as dark as most this size.

Also my eyes are not as good as several years ago, and I haven't seen a large sunspot for a long time.

Author:  Cliff [ Sat Apr 13, 2019 8:14 pm ]
Post subject:  Re: Sunspot

Nice one spotting it without using a scope.
Best wishes from Cliff

Author:  RMSteele [ Wed Apr 17, 2019 12:41 am ]
Post subject:  Re: Sunspot

Hello Cliff, David, April 17 0020 UT. The spot still prominent but the light bridge (see comments in gallery on Cliff’s image of 13th) seems to have gone. The following side of the spot’s umbra is extended in a lobe and that side of the umbra seems a slightly lighter tone than the rest - an extended remnant of the light bridge perhaps? 80mm refractor f5, x2 Barlow, 10 mm eyepiece, by projection in white light to a large image scale, seeing 2, transparency 2, Melbourne, Aus. I wonder if the spot is still visible to the NE.
Kind thoughts, Bob

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