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 1968 Amateur Radio Magazine, QST Journal of ARRL, March US $10.00 
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 QST AMATEUR RADIO VOLUME LI NO. 8 MAGAZINE AUGUST 1967 US $7.50
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What is The planetary A index? Why do shortwave broadcasters need this number?
SB PROP @ ARL $ARLP004
ARLP004 Propagation de K7RA
ZCZC AP04
QST de W1AW
Propagation Forecast Bulletin 4 ARLP004
From Tad Cook, K7RA
Seattle, WA January 26, 2007
To all radio amateurs
SB PROP ARL ARLP004
ARLP004 Propagation de K7RA
Low geomagnetic activity will be good for this weekend's CQ World Wide 160-Meter CW Contest. But there is currently a flare-spewing sunspot just around the Sun's eastern limb, and when it swings into view we'll see solar flux about 10 points higher than now, and briefly some higher geomagnetic numbers. The planetary A index for January 26-31 is predicted at 5, 5, 15, 20, 20 and 15.
It's a measurement of earths magnetic field's disturbance.
It varies from 0 to 400.
Magnetic field's disturbance produce electromagnetic radiation all over earth, and this creates noise in radio broadcast.. That is why it is necessary for broadcasters to determine how much noise can harm there broadcast contents.
Whats On My YouTube Today?
Anthony Marcoccia's 1st amateur boxing fight
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