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[IRCA] Increased Chance Of Shortwave Fadeout of MF and HF Signals
- Subject: [IRCA] Increased Chance Of Shortwave Fadeout of MF and HF Signals
- From: "Thomas F. Giella" <thomasfgiella@xxxxxxxxxxxxxxx>
- Date: Sun, 6 May 2012 10:13:56 -0400
New sunspot group #11476 has risen around the east limb of the sun and is
currently located near N09E67. It currently contains a twisted (Delta)
magnetic signature capable of producing M and isolated X class solar flares.
The solar flares may eject geo-effective position (earth directed) energetic
protons with energies greater than 10 MeV (10+0), causing increased D layer
absorption of MF and HF (300-14350 kc) signals (Shortwave Fadeout) (Sudden
Ionosphere Disturbance) along high latitude paths.
Normally this is a daytime occurrence at high latitude but the energetic
protons can precipitate along magnetic field lines into the equatorial ring
current, creating D layer absorption of MF and HF signals at mid and
equatorial latitudes both at day and night time.
Also large recurrent transequatorial coronal hole #515 will be in
geo-effective position (earth facing) between May 07-08, 2012. This will
create minor Kp-5
to isolated moderate Kp-6 geomagnetic storming between May-09-11, 2012.
The updated forecast for ham 12 and 10 meters, SWL 11 meters (in red color)
can be seen at : http://www.solarcycle24.org
73 & GUD DX,
Thomas F. Giella, NZ4O
Retired Meteorologist & Solar Physicist
Lakeland, FL, USA
eMail Reflector Moderator & Owner
NZ4O MF/HF/6M (600-6 Meters) Radiowave Propagation Forecast:
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NZ4O Solar Space Weather & Geomagnetic Data Dashboard:
NZ4O Solar Cycle 24 Forecast Discussion & Archive:
NZ4O 160 Meter (MF) Radio Propagation Theory Notes:
NZ4O Solar Space Weather & Geomagnetic Raw Forecast Data Links:
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