Solar Cycle 25

Propagation questions, answers and general information
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Jim (Bournemouth)
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Joined: 18 Sep 2014 05:59
Location: Bournemouth, Dorset IO90BR
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Solar Cycle 25

Post by Jim (Bournemouth) » 28 Aug 2017 20:42

With Cycle 24 now being well advanced on its downward path with solar minimum being expected in many quarters in 2019 or 2020, it is interesting that there are some optimistic signs that solar minimum may be comming sooner than we all think.

IN late December last year, some tiny sunspots at a high latitude with reversed polarity (compared with spots belonging to this cycle) were observed.

(Sunspots belonging to the next cycle generally have the opposite polarity compared with those belonging to the current cycle. Also, new cycle activity appears at high solar latitudes and the spots drift closer to the solar equator as the cycle proceeds.)

Then, earlier this month, another few spots were observed at high latitude also with reversed polarity. This together with some spotless but active regions known as "plage" at high latitudes this month. Then, today, I read this on http://www.solen.info/solar/ -
" The first cycle 25 spot observable at a 1K resolution was noted for several hours today. At noon the active region was located at N43W14, see linked image produced by my automatic spot counting software:

http://www.solen.info/solar/images/2017 ... ots_1k.png

The appearance of a cycle 25 region now could point to a solar cycle minimum in about a year.
This could be very good news.
It may mean that:

**The solar minimum could be sooner than expected.

** It could well be a relatively shallow minimum (the last one in 2008/9 was very deep)

** Cycle 25 could well be larger than Cycle 24 was, though current forecasts based on the extent of solar magnetic fields (which reverse once a cycle, at solar max) currently suggest that C25 will likely be equal or perhaps slightly larger than C24.

We shall see. But it could well be that predictions of a prolonged solar minimum ( "Dalton Minimum" ) could well be exaggerated.
Jim, Bournemouth, Dorset. IO90BR.

Elad FDM-S2, Perseus/FM+ and Funcube Dongle SDR Recievers 8-element OP-DES for Band 2, 12-ele ZL Special for 2m, plus wideband vertical
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John Faulkner, Skegness
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Re: Solar Cycle 25

Post by John Faulkner, Skegness » 29 Aug 2017 10:51

Thanks for this interesting article Jim.

Medium Wave DXers won't be happy to read this. But this is quite the opposite of what was predicted for the forthcoming minimum. Being a medium wave DXer myself, I just hope they are wrong and the cycle 25 spots are premature.

Jim (Bournemouth)
Posts: 292
Joined: 18 Sep 2014 05:59
Location: Bournemouth, Dorset IO90BR
Contact:

Re: Solar Cycle 25

Post by Jim (Bournemouth) » 29 Aug 2017 12:58

Cheers John.

The post was written from the POV of an HF DX enthusiast, can understand MW types hoping for a long period of low solar activity!
Jim, Bournemouth, Dorset. IO90BR.

Elad FDM-S2, Perseus/FM+ and Funcube Dongle SDR Recievers 8-element OP-DES for Band 2, 12-ele ZL Special for 2m, plus wideband vertical
.

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