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 Lowest of low ss#

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T O P I C    R E V I E W
vk3pa Posted - 17 Jul 2008 : 1:36:02 PM
July 16, 2008:

Today's 1700/2000/2300 UTC solar flux index readings were as follows; 64.2
64.6 64.6. The 64.2 reading is the lowest of solar cycle 23 and the lowest
since the 64.5 which occurred on July 18, 1996 at the bottom of solar cycle
22.
From memory (and it may be incorrect) the 64.2 is the lowest SFI ever
measured.

3   L A T E S T    R E P L I E S    (Newest First)
vk3pa Posted - 22 Aug 2009 : 03:43:57 AM
back dn to 66-9-0 sfi a k..
42days of no sun spots,..how muck longer can it last? I'm saying look for 60 days +
Muf only getting above 30 Mhz in northern hemispher es only for a couples of hours on the odd day!!
es dey say globle warming is man made hi hi es we dont under stand de SUN es "her" mood swings..
vk3pa Posted - 18 Jul 2008 : 1:50:17 PM
the reading was the second lowest ever recorded. The lowest SFI was
62.6 on November 3, 1954!!!
vk3pa Posted - 17 Jul 2008 : 2:00:42 PM
Explanation of today's Solar Flux by Leif Svalgaard

There are TWO numbers for the 10.7 flux. The observed number which is the ionosphere sees and is important for radio reception and the adjusted number which is what the Sun puts out. The difference comes about because the Earth's orbit is not circular and we are closest to the Sun in January [10.7 flux is 3.3% higher then] and furthest away in July [flux is 3.3% lower], so the the number you mention is 'artificially' too low simply because we are far from the Sun more or less right now. The 'real' number today is 66.7 [which is low enough], but still a bit higher than the 66.0 back in Oct. 22, 2007.


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