Tuesday, 5 February 2008

Propagation February 2008

Propagation Forecast

The second half of January has remained calm with but February will start off disturbed with the A index at 15, and the K at 4. By the 5th Feb, the A will have dropped to 5, and the K to 2, remaining calm until the 9th, when the A index rises to 15 and the K index to 4. By February 14th, conditions will have settled down again, with the A index at 5 and the K at 2, remaining the same until at least the 18th.
The Solar Flux however, is on a downward trend for February, starting off at 80, then dropping to 75 by the 4th and again dropping to 70 by the 14th. In conclusion, HF reception conditions for February should start off disturbed till the 4th, remaining calm till the 8th. The 9th to the 13th will again be disturbed then conditions should remain calm from the 14th. (Based on the 28 day forecast From WM7D.net)

Solar Cycle 23 VS Solar Cycle 24
There is still much debate among the experts about the emergence of Solar Cycle 24. According to this article from ARRL, (http://www.arrl.org/news/stories/2008/01/18/100/) "Old Cycle 23 spots will appear near the Sun's equator. The first spots of Cycle 24 are at a high solar latitude and will have magnetic polarity opposite of the old spots. There was a brief appearance on January 11 by an "almost sunspot" that had disappeared by the following day; it appeared to be a Cycle 24 spot -- with polarity reversed from Cycle 23 spots -- but it was near the equator, which is the wrong place for a new cycle sunspot."
However, looking at the sunspot number chart on http://www.solarcycle24.com/indexdx.htm sunspot numbers have definitely been on a downward trend. April 2006 had the highest sunspot number of 105, compared with April 07 when it was down to 38. It then peaked at 63 in June 07, and has again been on a downward trend remaining at 15 in October and November 07. Then December '07, saw a significant rise to 44.
Propagation Websites.

‘The Basics Of Radio Wave Propagation’ by Edwin C. Jones, MD, PhD (AE4TM) covers the subjects of Aurora, Backscatter and Grey Line propagation and related subjects, plus Maximum User Frequencies etc. The URL is: http://ecjones.org/propag.html. The XE1BEF website has a comprehensive links page of propagation software and specialist websites, although their bulletin is not currently available in English. http://members.fortunecity.com/xe1bef/propagation.htm. Thanks to Mike Terry and Ken Fletcher for links and updates. Links from this article can be found at http://www.jameswelsh.co.nr/

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