UPI NewsTrack Health and Science News
Published: April 1, 2009 at 5:44 PM

Solar activity lowest in nearly 100 years

GREENBELT, Md., April 1 (UPI) -- U.S. solar physicists say the sun is
experiencing the least sunspot activity since 1913 and activity is becoming
event less frequent.

National Aeronautics and Space Administration solar physicist Dean Pesnell
at the Goddard Space Flight Center in Greenbelt, Md., said during 2008 there
were no sunspots observed on 266 of the year's 366 days -- 73 percent of the
year. To find a year with more blank suns, you have to go to 1913, which had
311 spotless days.

That has led some observers to suggest the solar cycle hit bottom last year.
But Pesnell says that might not be the case, since, there were no sunspots
on 78 of this year's first 90 days -- 87 percent of that period.

In addition, measurements by the Ulysses spacecraft reveal a 20 percent drop
in solar wind since the mid-1990s -- the lowest since such measurements
began in the 1960s. And NASA says the sun's brightness has dimmed 0.02
percent at visible wavelengths and 6 percent at extreme UV wavelengths since
the solar minimum of 1996.

Competing models created by solar physicists disagree on when the solar
minimum will end and NASA says that great uncertainty stems from one simple
fact: No one fully understands the underlying physics of the sunspot cycle.

that spot on Jupiter is shrinking, Where is Al Gore when you need him,
probably off jettin around some where.


"Ms. 2" wrote in message
...
UPI NewsTrack Health and Science News
Published: April 1, 2009 at 5:44 PM

Solar activity lowest in nearly 100 years

GREENBELT, Md., April 1 (UPI) -- U.S. solar physicists say the sun is
experiencing the least sunspot activity since 1913 and activity is
becoming event less frequent.

National Aeronautics and Space Administration solar physicist Dean Pesnell
at the Goddard Space Flight Center in Greenbelt, Md., said during 2008
there were no sunspots observed on 266 of the year's 366 days -- 73
percent of the year. To find a year with more blank suns, you have to go
to 1913, which had 311 spotless days.

That has led some observers to suggest the solar cycle hit bottom last
year. But Pesnell says that might not be the case, since, there were no
sunspots on 78 of this year's first 90 days -- 87 percent of that period.

In addition, measurements by the Ulysses spacecraft reveal a 20 percent
drop in solar wind since the mid-1990s -- the lowest since such
measurements began in the 1960s. And NASA says the sun's brightness has
dimmed 0.02 percent at visible wavelengths and 6 percent at extreme UV
wavelengths since the solar minimum of 1996.

Competing models created by solar physicists disagree on when the solar
minimum will end and NASA says that great uncertainty stems from one
simple fact: No one fully understands the underlying physics of the
sunspot cycle.