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Thursday, March 17, 2011

Solar acrivity decline - 7 MHz spectrum research

Solar activity has nosedived over the past day - the 10.7 cm solar flux
has dropped to 102, and the daily SSN has fallen to 50. These levels are
very low, and long distance multi-hop propagation is unreliable on
frequencies above 12 MHz for darkness paths.

Here in Melbourne, we are now within the autumn equinox window - we are
still on Australian Eastern Summer Time, which is a real pain, as sunrise
doesn't happen now until after 7am!

The later sunrise means that the bands below 10 MHz are now very good much
later, for shortpath (darkness) transmissions from Asia, Europe, Middle
East, and Africa - 5 MHz up to 2200, 6 MHz up to 2300, 7 MHz up to 0000, and
9 MHz up to 0100.

This is a summary of main occupancies intercepted in the upper section of
the 7 MHz
band, between 2100 and 2200, on March 16, 2011.

7290 CHINA CRI-Xian Korean 2145
7305 CHINA CNR1 Chinese 2130
78310 ROMANIA RRI English 2100
7335 CHINA CNR2 Chinese 2145
7340 RUSSIA VOR-Novosibirsk Spanish 2140
7370 ENGLAND VOV-Woofferton Vietnamese 2130
7395 KUWAIT RFE Russian 2140
7405 CHINA CRI-Beijing English 2135
7415 CHINA CRI-Kashi English 2130
7435 ALBANIA R.Tirana Albanian 2200
7450 GREECE VOG Greek 2130
7460 MONGOLIA RFA-Ulaan Bataar Korean 2130
7475 GREECE VOG Greek 2135
7480 FRANCE Libyan BS-Issoudin, Arabic 2130
7495 MARIANAS RFA-Tinian Chinese 2145
7520 SRI LANKA R. Farda, Iranawela, Farsi 2135
7550 INDIA AIR English 2140
7560 KUWAIT VOA English 2100
7589 SRI LANKA R. Farda, Iranawela, Farsi 2130
7590 KAZAKHSTAN WYFR-Alma Ata, English 2150

Regards from Melbourne!

Bob Padula

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