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Solar wind
speed: 472.1 km/sec
density: 9.4 protons/cm3
explanation | more data
Updated: Today at 2347 UT
X-ray Solar Flares
6-hr max: C1
2202 UT Apr02
24-hr: C1
0534 UT Apr02
explanation | more data
Updated: Today at: 2300 UT
Daily Sun: 02 Apr 15
None of these sunspots has the type of unstable magnetic field that poses a threat for strong flares. Solar activity is low. Credit: SDO/HMI

Sunspot number: 69
What is the sunspot number?
Updated 02 Apr 2015

Spotless Days
Current Stretch: 0 days
2015 total: 0 days (0%)

2014 total: 1 day (<1%)
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%)

Updated 02 Apr 2015

The Radio Sun
10.7 cm flux: 128 sfu
explanation | more data
Updated 02 Apr 2015

Current Auroral Oval:
Switch to: Europe, USA, New Zealand, Antarctica
Credit: NOAA/Ovation
Planetary K-index
Now: Kp= 3 quiet
24-hr max: Kp= 3
explanation | more data
Interplanetary Mag. Field
Btotal: 6.6 nT
Bz: 5.5 nT north
explanation | more data
Updated: Today at 2347 UT
Coronal Holes: 02 Apr 15

A stream of solar wind flowing from this equtorial coronal hole should reach Earth on April 3-4. Credit: SDO/AIA.
Noctilucent Clouds The southern season for NLCs has come to an end. The last clouds were observed by NASA's AIM spacecraft on Feb. 20, 2015. Now attention shifts to the northern hemisphere, where the first clouds of 2015 should appear in mid-May.
Switch view: Ross Ice Shelf, Antarctic Penninsula, East Antarctica, Polar
Updated at: 02-28-2015 02:55:03
NOAA Forecasts
Updated at: 2015 Apr 02 2200 UTC
0-24 hr
24-48 hr
20 %
25 %
05 %
05 %
Geomagnetic Storms:
Probabilities for significant disturbances in Earth's magnetic field are given for three activity levels: active, minor storm, severe storm
Updated at: 2015 Apr 02 2200 UTC
0-24 hr
24-48 hr
35 %
30 %
10 %
05 %
01 %
01 %
High latitudes
0-24 hr
24-48 hr
20 %
15 %
30 %
20 %
25 %
30 %
Thursday, Apr. 2, 2015
What's up in space

Come to Tromsø and share Marianne's passion for rural photography: invites you to experience "Heaven on Earth" with an aurora, fjord, fishing, whale watching, photography or sightseeing tour.

Chase the Light Tours

QUIET SUN: With no sunspots actively flaring, the sun's X-ray output has flatlined. Solar activity is very low. NOAA forecasters estimate a scant 5% chance of X-class flares today. Solar flare alerts: text, voice

TOTAL LUNAR ECLIPSE: It's déjà vu all over again. For the third time in less than a year, sky watchers in the United States can see a total eclipse of the Moon. The action begins Saturday morning, April 4th, at 3:16 a.m. Pacific Daylight Time when the edge of the Moon first enters the amber core of Earth’s shadow.  For the next hour and 45 minutes, Earth's shadow will move across the lunar disk, ultimately swallowing the entire Moon at 4:58 AM PDT. A movie from previews the transformation:

"Totality" is when the Moon is fully inside Earth's shadow. Some total eclipses last for more than an hour.  In this case, however, totality spans just 4 minutes and 43 seconds—a result of the fact that the Moon is skimming the outskirts of Earth's shadow rather than passing centrally through it. The brevity of the eclipse highlights the importance of watching the clock:  Be outside no later than 4:58 AM PDT to witness the red Moon.

Why red?

A quick trip to the Moon provides the answer: Imagine yourself standing on a dusty lunar plain looking up at the sky. Overhead hangs Earth, nightside down, completely hiding the sun behind it. The eclipse is underway.

You might expect Earth seen in this way to be utterly dark, but it's not. The rim of the planet looks like it is on fire. As you scan your eye around Earth's circumference, you're seeing every sunrise and every sunset in the world, all of them, all at once. This incredible light beams into the heart of Earth's shadow, filling it with a coppery glow and transforming the Moon into a great red orb when viewed from Earth.

The eclipse will be visible, to some degree, across the entire Pacific side of our planet. A map of the eclipse zone shows where to look.

Realtime Eclipse Photo Gallery

LONG SOLAR FILAMENT: Most solar flares come from sunspots. The next big explosion, however, could come from a different source: A huge magnetic filament is hanging precariously over the surface of the sun. NASA's Solar Dynamics Observatory (SDO) photographed the structure on April 2nd:

From end to end, the plasma-loaded filament stretches 700,000 km, almost twice the distance from Earth to the Moon. The dimensions of the structure make it an easy target not only for space telescopes like SDO, but also for backyard solar telescopes on Earth.

If the filament becomes unstable and erupts, it could hurl parts of itself into space. Pieces of the filament falling back to the solar surface would explode upon impact, creating one or more Hyder flares. Amateur astronomers are encouraged to monitor the structure as it turns toward Earth. A photogenic explosion might be in the offing.

Realtime Space Weather Photo Gallery

Realtime Aurora Photo Gallery

Realtime Comet Photo Gallery

  All Sky Fireball Network

Every night, a network of NASA all-sky cameras scans the skies above the United States for meteoritic fireballs. Automated software maintained by NASA's Meteoroid Environment Office calculates their orbits, velocity, penetration depth in Earth's atmosphere and many other characteristics. Daily results are presented here on

On Apr. 2, 2015, the network reported 4 fireballs.
(4 sporadics)

In this diagram of the inner solar system, all of the fireball orbits intersect at a single point--Earth. The orbits are color-coded by velocity, from slow (red) to fast (blue). [Larger image] [movies]

  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 2, 2015 there were potentially hazardous asteroids.
Recent & Upcoming Earth-asteroid encounters:
Miss Distance
2015 FA285
Mar 31
6.4 LD
23 m
2015 FW117
Apr 1
3.6 LD
124 m
2015 FW284
Apr 1
11.5 LD
49 m
2015 CW13
Apr 3
13.5 LD
108 m
2015 FK120
Apr 5
5.8 LD
16 m
2015 FN33
Apr 6
9.8 LD
26 m
2063 Bacchus
Apr 7
76 LD
1.6 km
2005 KA
Apr 12
13 LD
50 m
5381 Sekhmet
May 17
62.8 LD
2.1 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.
  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
  the underlying science of space weather
Space Weather Alerts
  more links...
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