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Saturday, February 20, 2010

11 MHz spectrum survey

This from the ARRL Propagation Report of Feb 19, 2010:

"We've now observed sunspots continuously for the past 30 days, certainly a turnaround from the quiet conditions of the past few years. In fact, in ten weeks we have seen only three days with no sunspots, on December 25, January
6 and January 19. This is a little over 4% no-sunspot days, a nice contrast with all of 2009, with over 71% days with no sunspots.

Sunspot group 1049 emerged on Wednesday Feb 17, and it is growing.

The minimum non-zero sunspot number is 11. This is because the numbers are derived from the number of sunspot groups, plus areas inside the groups. Each group counts for 10, so the minimum sunspot number is 11, and the
minimum sunspot number for at least two sunspot groups is 22.

In 2009 only 87 days (23.8%) had sunspot numbers greater than 11, and 21 of those days were in December. Only 43 days (11.8%) had a sunspot number greater than 15 (14 of those in December), and only 26 days in 2009 had a
sunspot number of 23 or more (none had 22).

Since the first of the year, average weekly sunspot numbers were 14.6, 26.4, 18.6, 28, 14.6, 43.3, and 38.7.
Sunspot numbers for February 11 through 17 were 64, 38, 37, 28, 27, 28, and 49 with a mean of 38.7. 10.7 cm flux was 94.2, 95.5, 94.1, 89.4, 87.6, 86.8, and 86.9 with a mean of 90.6. Estimated planetary A indices were 5, 6, 3, 4,
14, 9 and 4 with a mean of 6.4. Estimated mid-latitude A indices were 4, 4, 2, 3, 8, 11 and 2 with a mean of 4.9"

Here in Melbourne, sporting capital of the world, there continues to be excellent openings on 11 MHz in our post sunrise period, in the window 2000 to 2100, dominated by shortpath propagation from Europe, Africa, the Middle
East, and Asia. Longpath from the Americas has also been in evidence.

This is a summary of key occupancies observed on Feb 19, 2010, 2000 to 2100:

11510 EGYPT R. Cairo English to 2030*
11540 EGYPT R. Cairo Arabic
11550 USA WEWN Spanish (longpath)
11565 USA WYFR German (longpath)
11605 RWANDA DW Kigali German
11625 VATICAN VR SMG 2015
11650 AUSTRALIA RA Shepparton English 11660 11880
11665 USA WYFR Polish
11720 VIETNAM VOV East Sea service Vietnamese
11725 NZ RNZI English
11760 CUBA RHC English (longpath)
11770 CUBA RHC Arabic (longpath)
11775 ANGUILLA University Network English (longpath)
11820 S. ARABIA BSKSA Arabic
11865 CANADA RCI Sackville *2000 Arabic (longpath)
11900 MARIANAS RFA Tinian Mandarin
11915 S. ARABIA BSKSA Arabic
11975 N. ANTILLES VOA Bonaire English (longpath)
12030 SPAIN REE Arabic

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