That's a very interesting article, maybe the scientists are getting some
insight to how the Sun really works. Way above my expertise but an
interesting read.
However, if this paper is correct, from the extract: "This trend is
anticipated to continue in the next six centuries that can lead to a
further natural increase of the terrestrial temperature by more than
2.5?????C by 2600."
OOPS.
Grant KZ1W
On 9/11/2019 1:57 PM, Ken Bauer via TowerTalk wrote:
Speaking of the Maunder Minimum, for those of you who are so inclined, there is
an interesting juried paper published online in Nature
https://www.nature.com/articles/s41598-019-45584-3
arguing that we are entering the next ???Grand Minimum??? which should run from
2019 through 2055. Even if I outlive it, I certainly won???t be on the air :-(
That and K0CAT???s very informative series of articles in Lenoir, NC ARC
online newsletter beginning 6/2017, chronicling his adventures raising his
tower and antennas, has dampened my enthusiasm for jumping right in to tackle
my first tower, now that I???m past my mid-sixties. Will adopt a ???wait and
see??? attitude and play with wire antennas in the tall firs for a few years
and hope that cycle 25 is close to cycle 24 (hope NOAA is right) or (dare I
hope) even better, rather than just staying where we are for the rest of my
life. (See the Wikipedia article on Maunder Minimum which cites 19th century
papers by Sporer stating from 1672 to 1699 there were a total of 50 sunspots
observed in the twenty five years; 1,000x less that what would be normal for a
25 year period.)
What do you think guys? Say it ain???t so!
(Otherwise may have to focus on data modes with forward error correcting codes
and operate below the noise level, or maybe get into VHF DXing, but have always
loved the magic of HF and the Ionisphere)
73,
Ken WC6Y
On Sep 11, 2019, at 6:16 AM, jimlux <jimlux@earthlink.net> wrote:
On 9/11/19 6:05 AM, Don Havlicek wrote:
There have been minor sunspot regions in the past year, but nothing sustaining.
73
Don
N8DE
Sent from my Verizon Motorola Smartphone
On Sep 10, 2019 9:45 PM, john@kk9a.com wrote:
Wow, what is the record? I guess I haven't missed much being QRT
since the March WPX contest:)
John KK9A - PJ4R
The record? Probably the Maunder Minimum from 1645 to 1715
And as always, there's some discussion in the scientific community about what
constitutes a sunspot, what the correlation between sunspot number (or Smoothed
Sunspot number) and solar activity is, etc.
The propagation models all take SSN as an input, but what really affects the
ionosphere is the intensity of the UV light falling on it - unfortunatately,
there were no orbiting satellites to measure UV insolation nor any ionosondes
back then, so counting visible sunspots serve as a proxy for solar activity.
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