Re: Topband: Three day forecast of the Planetary Kp Index now available online

[fmoeves]

Thanks for this Mike. I never spend enough time on this site. Thanks for the 
reminder. 73 Fred KB4QZH 
 Original message From: Mike Waters  Date: 
7/30/20  6:44 PM  (GMT-05:00) To: donov...@erols.com Cc: topband 
 Subject: Re: Topband: Three day forecast of the 
Planetary Kp Index now
  available online To add to this ...*THE SOLAR MINIMUM SUPERSTORM OF 1903:* 
Don't let Solar Minimum fool you.Superstorms are possible even during the 
"quiet" phase of the solar cycle.A new study just published in the 
Astrophysical Journal Letters looks backto October 1903. Solar activity was at 
a low point eerily similar to nowwhen one of the biggest storms in modern 
history erupted. Get the fullstory at 
Spaceweather.com<https://spaceweather.us11.list-manage.com/track/click?u=0c5fce34d5ca05f64a13d085d=ef4518f64d=7b45d19012>.73,
 MikeW0BTUOn Fri, Jul 24, 2020, 1:30 PM  wrote:> Daily 
variability of HF propagation ... especially during the four years> closest to 
solar minimum ...>_Searchable Archives: 
http://www.contesting.com/_topband - Topband Reflector
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Re: Topband: Three day forecast of the Planetary Kp Index now available online

[Mike Waters]

To add to this ...

*THE SOLAR MINIMUM SUPERSTORM OF 1903:* Don't let Solar Minimum fool you.
Superstorms are possible even during the "quiet" phase of the solar cycle.
A new study just published in the Astrophysical Journal Letters looks back
to October 1903. Solar activity was at a low point eerily similar to now
when one of the biggest storms in modern history erupted. Get the full
story at Spaceweather.com

.

73, Mike
W0BTU

On Fri, Jul 24, 2020, 1:30 PM  wrote:

> Daily variability of HF propagation ... especially during the four years
> closest to solar minimum ...
>
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Topband: Three day forecast of the Planetary Kp Index now available online

[donovanf]

Daily variability of HF propagation is caused in large part by solar energetic 
particle radiation carried by the solar wind, especially during the four years 
closest to solar minimum when x-ray and proton radiation from solar flares are 
less frequent and less intense. 

The three-hourly Planetary Kp Index uses geomagnetic measurements from 13 
observatories at mid-latitudes to indirectly measure solar energetic particle 
radiation. The Planetary Kp Index is a proxy measurement of the energy input 
from the solar wind to Earth, similar to the use of the 2800 MHz Solar Flux 
Index as a proxy for the Sun's ionizing ultraviolet radiation. 


A three day -- updated every three hours -- forecast of the Planetary Kp Index 
is now available from the Helmholtz Centre Potsdam - GFZ German Research Centre 
for Geosciences. 


spaceweather.gfz-potsdam.de/fileadmin/ruggero/Kp_forecast/forecast_figures/KP_FORECAST_CURRENT.png
 


73 
Frank 
W3LPL 

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