Topband: COSMIC RAY UPDATE
nhp at ieee.org
Sat Dec 14 20:12:43 EST 2019
But doesn't the graph referenced in your link
https://spaceweather.com/repeat_images/crinfo2.png indicate that the
greatest strength from cosmic rays was 2009-2010, when trans polar
conditions were at their best, Bill?
I'd defer to K9LA's comments in a heartbeat, but isn't the one (the
primary?) reason for greater penetration of cosmic rays the weakening
geomagnetic activity that occurs during solar minimum, and that's related
to the intensity and speed of the solar wind, driven by coronal mass
ejections and such like. According to
https://www.swpc.noaa.gov/products/solar-cycle-progression, we are only now
approaching the low levels of geomagnetic activity (Ap progression chart)
seen in 2009 / 2010. Of course we may never reach those levels. We
have to wait and see.
On Sat, Dec 14, 2019 at 6:24 PM Bill Tippett <btippett at alum.mit.edu> wrote:
> This could account for relatively poor conditions on 160 despite the low SF
> and K indices:
> *COSMIC RAY UPDATE:* Something ironic is happening in Earth’s atmosphere.
> Solar activity is low–very low. Yet atmospheric radiation is heading in the
> opposite direction. Cosmic rays percolating through the air around us are
> at a 5 year high and only percentage points away from a Space Age record.
> Find out what's happening on today's edition of Spaceweather.com
> 73, Bill W4ZV
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