Technical information

(ended at ____UT)
C. The forecast for the next 24 hours follows: (includes any of the
following)
1. (X) Solar activity will be (very low) (low) (moderate) (high)
(very high)
2. (X) The geomagnetic field will be (quiet) (unsettled) (active)
3. ( ) A geomagnetic storm is expected (days-approx. time UT)
4. ( ) A proton event is expected (day-approx. time UT)
5. ( ) Stratwarm (alert - day [s]) (in progress) (ended - days)
(brief description of conditions)
GLOSSARY OF TERMS FOR THE SESC WWV
VOICE MESSAGE
A. 1. Solar Flux: Radio flux in flux units (10
-22
Wm
-2
Hz
-1
) at
10 cm (2800 MHz) at local noon (1700 GMT); observed at the
Algonquin radio observatory, operated by the Canadian
National Research Counsel, Ottawa.
A-Index: The A-index is derived from eight successive 3-hourly
K-indices and gives an indication of how disturbed the
geomagnetic field has been over a 24-hour period (in this case,
the current GMT day). The A-Index reported is that observed at
Fredericksburg, Va. (a mid-latitude station).
A.2. K-Index: The K-value is a quasi-logarithmic index of
geomagnetic activity over a 3-hour period ranging from O (very
quiet) to 9 (very disturbed). It is obtained by determining the
maximum deviation from the quiet day curve of the most
disturbed component of the geomagnetic field. The K-Index
reported is that observed at the Boulder, Colorado station.
B.1. Solar Activity
Very Low: Usually only quiet regions on the solar disk and no
more than five of these; fewer than ten class C subflares with
out centimetric radio bursts or Sudden Ionospheric Disturbance
(SID) observed or expected.
Low: Usually more than five, but less than ten, quiet regions
on the solar disk; only class C subflares without centimetric
Appendices
13-2
KHF 950/990 Pilots Guide
Rev. 0
Dec/96