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Solar wind
speed: 349.5 km/sec
density: 2.9 protons/cm3
explanation | more data
Updated: Today at 2347 UT
X-ray Solar Flares
6-hr max: C1
2003 UT Apr09
24-hr: C2
0724 UT Apr09
explanation | more data
Updated: Today at: 2300 UT
Daily Sun: 09 Apr 13
Sunspot AR1718 is growing rapidly and could pose a threat for Earth-directed M-class solar flares. Credit: SDO/HMI
Sunspot number: 162
What is the sunspot number?
Updated 09 Apr 2013

Spotless Days
Current Stretch: 0 days
2013 total: 0 days (0%)
2012 total: 0 days (0%)
2011 total: 2 days (<1%)
2010 total: 51 days (14%)
2009 total: 260 days (71%)
Since 2004: 821 days
Typical Solar Min: 486 days

Update
09 Apr 2013

The Radio Sun
10.7 cm flux: 139 sfu
explanation | more data
Updated 09 Apr 2013

Current Auroral Oval:
Switch to: Europe, USA, New Zealand, Antarctica
Credit: NOAA/POES
Planetary K-index
Now: Kp= 1 quiet
24-hr max: Kp= 2
quiet
explanation | more data
Interplanetary Mag. Field
Btotal: 5.5 nT
Bz: 1.9 nT north
explanation | more data
Updated: Today at 1427 UT
Coronal Holes: 09 Apr 13
Solar wind flowing from this sinuous coronal hole could reach Earth on April 11-12. Credit: SDO/AIA.
SPACE WEATHER
NOAA Forecasts
Updated at: 2013 Apr 09 2200 UTC
FLARE
0-24 hr
24-48 hr
CLASS M
20 %
20 %
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: 2013 Apr 09 2200 UTC
Mid-latitudes
0-24 hr
24-48 hr
ACTIVE
15 %
10 %
MINOR
05 %
01 %
SEVERE
01 %
01 %
High latitudes
0-24 hr
24-48 hr
ACTIVE
15 %
15 %
MINOR
25 %
15 %
SEVERE
20 %
10 %
 
Tuesday, Apr. 9, 2013
What's up in space
 

Listen to radar echoes from satellites and meteors, live on listener-supported Space Weather Radio.

 
Spaceweather Radio is on the air

TROUBLE CONTACTING MARS: NASA is suspending communications with Mars rovers and orbiters this month as the Red Planet passes almost directly behind the sun. Mars is less than 2o from the sun now, and the distance will narrow to a mere 0.4o on April 17th. "The sun can easily disrupt radio transmissions during the near-alignment," explains a NASA press release.

FAST-GROWING SUNSPOT: Solar activity is low, but a fast-growing sunspot could break the spell of quiet. AR1718 has more than doubled in size during the past 48 hours as shown in this movie from the Solar Dynamics Observatory:

The magnetic field of AR1718 is rapidly changing and therefore prone to instabilities. If it criss-crosses and reconnects--bang! A solar flare could occur. Because of the sunspot's central location on the solar disk, any eruptions would be Earth-directed. NOAA forecasters estimate a 20% chance of M-class flares on April 9th. Solar flare alerts: text, voice.

Realtime Space Weather Photo Gallery

COMET ISON UPDATE: In November 2013, Comet ISON could become one of the brightest and most active comets in years when it races through the hot atmosphere of the sun. Right now, though, it is just a dim speck in the deep-freeze of space near the orbit of Jupiter. Alberto Quijano Vodniza photographed the barely-visible comet on April 7th from his private observatory in Pasto, Narino, Colombia:

Comet ISON may look underwhelming, but that is only because it is so far away, more than 400 million miles from the sun. In fact, it is already an active comet with considerable promise. Recent measurements by NASA's Swift spacecraft shows that the comet's nucleus is spewing more than 112,000 pounds (51,000 kg) of dust, or about two-thirds the mass of an unfueled space shuttle, every minute. To produce so much dust, the comet's nucleus is probably about 5 km wide. For comparison, the nucleus of bright sungrazing Comet Lovejoy, which wowed observers in 2011, was only about one-tenth as large. Comet ISON could put on quite a show when it approaches the sun later this year.

More about Comet ISON: NASA video, 3D orbit, ephemeris, light curves.

Realtime Comet Photo Gallery


Realtime Aurora Photo Gallery


Realtime Noctilucent Cloud Photo Gallery
[previous years: 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2011]

  Near Earth Asteroids
Potentially Hazardous Asteroids (PHAs) are space rocks larger than approximately 100m that can come closer to Earth than 0.05 AU. None of the known PHAs is on a collision course with our planet, although astronomers are finding new ones all the time.
On April 9, 2013 there were 1391 potentially hazardous asteroids.
Recent & Upcoming Earth-asteroid encounters:
Asteroid
Date(UT)
Miss Distance
Size
2010 GM23
Apr 13
3.9 LD
50 m
2013 GH23
Apr 19
5.5 LD
33 m
2005 NZ6
Apr 29
24.9 LD
1.3 km
2001 DQ8
Apr 30
74.3 LD
1.1 km
2004 BV102
May 25
69.9 LD
1.4 km
1998 QE2
May 31
15.2 LD
2.1 km
2000 FM10
Jun 5
50.3 LD
1.3 km
2002 KL3
Jun 6
66.4 LD
1.1 km
1999 WC2
Jun 12
39.2 LD
1.9 km
2006 RO36
Jun 18
70.9 LD
1.2 km
Notes: LD means "Lunar Distance." 1 LD = 384,401 km, the distance between Earth and the Moon. 1 LD also equals 0.00256 AU. MAG is the visual magnitude of the asteroid on the date of closest approach.
  Essential web links
NOAA Space Weather Prediction Center
  The official U.S. government space weather bureau
Atmospheric Optics
  The first place to look for information about sundogs, pillars, rainbows and related phenomena.
Solar Dynamics Observatory
  Researchers call it a "Hubble for the sun." SDO is the most advanced solar observatory ever.
STEREO
  3D views of the sun from NASA's Solar and Terrestrial Relations Observatory
Solar and Heliospheric Observatory
  Realtime and archival images of the Sun from SOHO.
Daily Sunspot Summaries
  from the NOAA Space Environment Center
Heliophysics
  the underlying science of space weather
Space Weather Alerts
   
  more links...
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