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UV C is inherently more energetic than UV B (frequency proportional to energy) but there is less of it in the free space solar spectrum. The designation UV C covers a much wider bandwidth though, so the total energy is greater. All things considered, UV C should contain about 6 and 3/4 times more energy than UVB, and besides that be more penetrative of the human body, since it has a shorter wavelength.
originally posted by: GaryN
a reply to: Ross 54
at Earth's (and Moon's) distance from the Sun should be around 400.
Thanks Ross. 400 for UV B. And what about the real nasty stuff that doesn't get through our atmosphere at all?
Surely there will have to be some serious safety concerns with visiting Mars, and definitely the Moon, developing cataracts a long way from home, or suffering arc-eye, would be very bad. Eagle Eyes Optics developed their glasses from NASA science it seems, just E-Mailed them to ask about UV C protection.
So these "observers" simply looked at the sun with unprotected, naked eyes and counted sun spots? Really? They could see sun spots when the sun was on the opposite side of the earth? Really? How did they know about sun spots to begin with? Are these the same people that thought the Earth was the center of the universe and the world was flat? Really?
originally posted by: glend
a reply to: Bilk22
originally posted by: woogleuk
a reply to: Skywatcher2011
This was taken by a friend on 5/7/2014, seems quite active, so it must have calmed down a lot over the last two weeks.
originally posted by: ElohimJD
originally posted by: Skywatcher2011
I find this subject interesting because it is an event that you don't hear about too often. Why does the sun take certain intermissions like this? Why don't we see this on a more frequent occurrence?
I am not a true expert on this matter...but my questions to this event are:
Do sun spots block excess heat coming to Earth?
If so...then will a spotless sun increase the average temperatures on Earth?
Heat is a measure of kinetic energy. Sunspots occur when energy is released from the Sun's surface (solar wind electrons). Increase of sunspots actually means a greater number of electron streams are released out from the Sun's surface in the form of "solar wind". This "cools" the sun's surface where the electron stream originated, thus appearing black/dark or like a "hole/spot".
The "luminosity" (brightness) of the sun is increased with no "spots" present. But energy/heat/kinetic force is held inside the sun while is such a state. The release of this energy/heat/kinetic force out from the sun in the form of increased numbers of spots would increase heat inside Earth's magnetosphere.
More spots = cooler sun's surface = warmer Earth's magnetosphere.
Less spots = warmer sun's surface = cooler Earth's magnetosphere.
Transfer of energy; Law of thermodynamics.
Another word of caution came from Hathaway, who notes that the Maunder Minimum might have been a catastrophic event rather than a gradual trend. “Many of my colleagues are poring over historical records to find out . . . what did lead up to the Maunder Minimum?” he says. “New observations suggestion that the cycle before the Maunder Minimum wasn’t particularly small.” Regardless of what’s causing the Sun’s strange behavior, Hathaway and Penn, who are both in the solar prediction business, anticipate that Cycle 25, expected to peak in 2024, will be the weakest yet. - See more at: www.skyandtelescope.com...
More spots = cooler sun's surface = warmer Earth's magnetosphere. Less spots = warmer sun's surface = cooler Earth's magnetosphere.
originally posted by: menneni
a reply to: Antoniastar
About the sunspots, well in fact those spots were gradually seen less and less for last year or so. Personally i've been waiting for the day when the sunspot number hits Zero, like it did on the 17th.
I guess we're up for a real climate change now for next couple decades or so.
It is kinda funny that there has been very little of news about our sun's behavior on MSM, since the last spotless year was 2011. Maybe "they" don't know what to say.
I always thought that MSM likes to induce panic.