|
  SPACE WEATHER
Current
Conditions
Solar Wind
velocity: 704.5
km/s
density:1.2
protons/cm3
More
about these data
Updated: Today at 2244
UT
Meteor Rates
(24 hr max.)
visual: 4 per hr
radio (89 MHz): 35 per hr
More
about these data
Updated: 11 Nov 2000
Sunspot Number: 141
More
about sunspots
Updated:
10
Nov
2000
Daily
Sun:11 Nov '00
All of the sunspots on
the visible disk have relatively simple alpha-
or beta-class magnetic fields. None appear to harbor energy
for explosions more powerful than an M-class eruption.
|
Coronal
Holes:
A high speed solar wind
stream from this coronal hole, which crossed the Sun's central
meridian on Friday, will likely arrive in the vicinity of our
planet sometime Sunday. Image credit: Yohkoh soft X-ray telescope.
More about coronal holes
 SPACE WEATHER
NOAA
Forecasts
Solar Flares: Probabilities
for a medium-sized (M-class)
or a major (X-class)
solar flare during the next 24/48 hours are tabulated below.
Updated
at 2000 Nov 11 2200 UT
|
FLARE |
24 hr |
48 hr |
|
CLASS M |
15
% |
15
% |
|
CLASS X |
01
% |
01
% |
Geomagnetic Storms: Probabilities
for significant disturbances in Earth's magnetic field are given
for three activity levels: active,
minor storm, severe
storm
Updated
at 2000 Nov 11 2200 UT
Mid-latitudes
|
24 hr |
48 hr |
|
ACTIVE |
35
% |
30
% |
|
MINOR |
25
% |
15
% |
|
SEVERE |
10
% |
05
% |
High latitudes
|
24 hr |
48 hr |
|
ACTIVE |
25
% |
25
% |
|
MINOR |
30
% |
20
% |
|
SEVERE |
20
% |
15
% |
|
What's
Up in Space -- 11
Nov
2000
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to Space Weather News!
 AURORA WARNING: Our planet is inside
a high-velocity solar wind stream with peak speeds exceeding
800 km/s. So far geomagnetic activity has been low because the
interplanetary magnetic field (IMF) around Earth is pointing
north. North-pointing IMFs reinforce the magnetosphere's
resistance to solar wind gusts. If, while we are inside this
high-speed stream, the IMF turns south (which would lower
our planet's magnetic defenses) there could be renewed geomagnetic
storming and aurora
IMPACT! A coronal mass ejection
hit Earth's magnetosphere Friday morning only 31 hours after
leaving the Sun. Its earlier-than-expected arrival at 0600 GMT
(1:00 am EST) sparked a G3-class geomagnetic storm that
lasted nine hours. Since then geomagnetic activity has subsided.
SOLAR RADIATION
STORM: On
Nov 8th a powerful solar
flare
triggered an S4-class solar radiation storm,
the fourth largest since 1976. The flux of high-energy
protons
near Earth was ~100,000 times greater than normal when the storm
peaked on Thursday. The storm caused HF radio blackouts, minor
electronic glitches on satellites, and would have posed a hazard
to astronauts on the International Space Station had they attempted
EVAs (space walks). Radiation counts finally declined below storm
levels on Saturday, Nov. 11th.
 The same eruption that
sparked Thursday's radiation storm also launched a coronal mass
ejection toward Earth. The CME left the Sun on Nov 8th traveling
2035 km/s (4.5 million mph) and hit Earth's magnetosphere Friday
morning. The CME is barely visible through the snow-like haze
of this SOHO coronagraph animation. The many specks and streaks
are energetic particles striking the spacecraft's CCD camera.
RECENT AURORA:
Updated Nov. 10 Geomagnetic
storms on Nov.
3rd and
Nov.
6th triggered
widespread Northern Lights.
FAST MOVING
ASTEROID: On
Nov. 7, 2000, a 250-meter wide asteroid named 2000 UG11 zipped
past our planet just 6.1 times farther away than the Moon. A
series of movies shows how the apparent speed of the asteroid rapidly
increased in the early days of November and then peaked at 29
degrees per day as the space rock made its closest approach to
Earth. Amateur astronomers with 8 inch or larger telescopes can
still spot 2000 UG11 for themselves as it slowly fades. [ephemeris
for observers]
WEB
LINKS: NOAA
FORECAST
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Nov. 7, 2000:
Much
Ado about 2000 SG344 -- In 2071 a relic of NASA's
earliest space exploration efforts might return to Earth, if
current estimates are confirmed.
Oct. 26, 2000:
Lunar
Leonids -- On Nov. 17, 2000, the moon will plow
through a stream of debris from comet Tempel-Tuttle.
Oct. 10, 2000:
The
Moonlit Leonids 2000 -- Our planet is heading
for a minefield of cosmic dust streams laid down by periodic
comet Tempel-Tuttle. The result could be a series of meteor outbursts
on Nov. 17 and 18, 2000.
Sept. 28, 2000:
Bright
Planets and Random Meteors --
This week's
new Moon sets a dark stage for a sporadic meteor show featuring
a cast of eye-catching stars and planets.
Sept. 20, 2000:
A
Good Month for Asteroids --
Five Near-Earth
Asteroids flew past our planet during the month of September.
Sept. 13, 2000:
A
Surprising Coronal Mass Ejection
-- A solar
filament collapsed and fell to the surface of the Sun, spawning
a coronal mass ejection that forecasters didn't expect.
Sept. 5, 2000:
Sunbathing
at Solar Max -- NASA scientists say that
solar maximum is now in full swing. Does that mean you're more
likely to suffer a sunburn at the beach? This story reveals the
answer.
Sept. 1, 2000:
A
Close Encounter with a Space Rock
-- A half-kilometer
wide asteroid zooms past Earth barely 12 times farther from our
planet than the Moon.
Aug. 14, 2000: The
Extraordinary Geomagnetic Perseid Meteor Shower -- A
coronal mass ejection hit Earth's magnetosphere just before the
peak of the 2000 Perseid meteor shower.
Aug. 8, 2000: Perseid
Dawn -- Stargazers
could spot as many as 100 Perseid meteors per hour before dawn
on August 12.
MORE SPACE WEATHER HEADLINES |
