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Solar wind
speed: 258.3 km/sec
density: 0.8 protons/cm3
explanation | more data
Updated: Today at 2350 UT
X-ray Solar Flares
6-hr max: C1
1554 UT Jun04
24-hr: C8
0947 UT Jun04
explanation | more data
Updated: Today at: 2300 UT
Daily Sun: 04 Jun 15
All of these sunspots are quiet and stable. Solar activity remains low. Credit: SDO/HMI

Sunspot number: 55
What is the sunspot number?
Updated 04 Jun 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 04 Jun 2015

The Radio Sun
10.7 cm flux: 109 sfu
explanation | more data
Updated 04 Jun 2015

Current Auroral Oval:
Switch to: Europe, USA, New Zealand, Antarctica
Credit: NOAA/Ovation
Planetary K-index
Now: Kp= 1 quiet
24-hr max: Kp= 1
explanation | more data
Interplanetary Mag. Field
Btotal: 3.3 nT
Bz: 0.9 nT south
explanation | more data
Updated: Today at 2350 UT
Coronal Holes: 04 Jun 15

Solar wind flowing from this minor coronal hole could reach Earth on June 8-9. Credit: SDO/AIA.
Noctilucent Clouds The northern season for NLCs is underway. NASA's AIM spacecraft spotted the first noctilucent clouds over the Arctic Circle on May 19th.
Switch view: Europe, USA, Asia, Polar
Updated at: 06-04-2015 15:55:03
NOAA Forecasts
Updated at: 2015 Jun 04 2200 UTC
0-24 hr
24-48 hr
20 %
20 %
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: 2015 Jun 04 2200 UTC
0-24 hr
24-48 hr
10 %
15 %
01 %
05 %
01 %
01 %
High latitudes
0-24 hr
24-48 hr
15 %
20 %
15 %
25 %
10 %
20 %
Thursday, Jun. 4, 2015
What's up in space

Learn to photograph Northern Lights like a pro. Sign up for Peter Rosen's Aurora Photo Courses in Abisko National Park, winner of the TripAdvisor Certificate of Excellence Award 2015.

Lapland tours

MORE SUNSPOTS, LESS QUIET: The sun has been quiet for much of the past month. This could change as two new sunspots emerge over the sun's eastern limb. Click to view a 24-hour movie from NASA's Solar Dynamics Observatory:

These new sunspots aren't very large, but at least one of them is active. The dark cores inside the uppermost circle are growing, and on June 4th they unleashed a C8-class solar flare.

Yes, that's right. The sun is so quiet that a C-class flare is newsworthy.

In fact, the C8-class flare of June 4th was almost 10 times stronger than any flare in the past month. This represents a genuine uptick in solar activity. If the development of the sunspot proceeds apace, genuinely strong flares could be in the offing. Stay tuned for less quiet. Solar flare alerts: text, voice

Realtime Space Weather Photo Gallery

DAYLIGHT METEOR SHOWER: On June 4th, the Canadian Meteor Orbit Radar (CMOR) detected a surge in meteor activity. "CMOR has begun to see the ramp up of the Daytime Arietid shower," reports Peter Brown of the University of Western Ontario. The pink "hot spot" in this CMOR sky map shows how the radar echoes are clustered in the constellation Aries--not far from the glaring sun:

"The Arietids are the fifth strongest shower of the year detected by CMOR," says Brown. "They are likely related to a complex of debris streams produced during the breakup of a large comet several millennia ago."

Ironically, most people never notice this relatively intense shower. The reason: It peaks in broad daylight. Compared to the human eye, radars do a much better job detecting meteors through the glare.

"Visual observers may be able to see a handful of Arietids in the hour or so before sunrise over the next week when the shower is at its peak," notes Brown. "These will all be  'Earthgrazers'--that is, meteors which enter at shallow (<10o) angles and streak across very long arcs in the sky. This peculiar visibility is a result of the radiant never getting much above the horizon at northern latitudes before the rising sun washes out the show."

"The shower is unique among CMOR streams in that it has a very broad peak lasting almost five days," adds Brown. "The best time to watch will be any day during the early morning hours of June 6 – June 12."

Extra: Listen to the Arietids on Space Weather Radio!

Realtime Meteor Photo Gallery

SPACE STATION MARATHON: What's better than seeing the International Space Station glide brightly among the stars on a warm summer night? How about seeing it four times? For the next few weeks, sky watchers in the northern hemisphere can catch the ISS making multiple passes over their home towns. Photographer Alan Dyer sends this report from Gleichen, Alberta: "On the night of May 31/June 1, I was able to shoot the passage of the International Space Station on each of four successive orbits, at 90-minute intervals, from dusk to dawn."

"Seeing the space station on not one but two, three, or even four orbits in one night is possible at this time of year near northern summer solstice because the Station is now continuously lit by sunlight -- the Sun never sets from the altitude of the ISS," explains Dyer. "When the ISS should be entering night, sunlight streaming over the north pole still lights the station at its altitude of 400 km."

Satellite enthusiasts call this an "ISS marathon." Find out when to look using's Simple Satellite Tracker.

Realtime Space Weather Photo Gallery

NOCTILUCENT CLOUD SIGHTINGS: We often say that noctilucent clouds are "electric blue." One glance at this photo from Kristianstad, Sweden, explains why:

"On Monday night, pale ripples spread across 90 degrees of the northern sky," says photographer Jonas Carlsson. "This is a great beginning to the 2015 season."

Since June began, sky watchers have seen noctilucent clouds over Ireland, Sweden, Denmark, Scotland and Russia. And more are in the offing.... Data from NASA's AIM spacecraft have shown that noctilucent clouds (NLCs) are like a great geophysical light bulb. They turn on every year in late spring, reaching almost full intensity over a period of no more than 5 to 10 days. News flash: the bulb is glowing, and it is definitely electric blue.

Noctilucent clouds first appeared in the 19th century after the eruption of super-volcano Krakatoa. At the time, people thought NLCs were caused by the eruption, but long after Krakatoa's ash settled, the clouds remained. In recent years, NLCs have intensified and spread with sightings as far south as Utah and Colorado. This could be a sign of increasing greenhouse gases in Earth's atmosphere.

Observing tips: Look west 30 to 60 minutes after sunset when the Sun has dipped 6o to 16o below the horizon. If you see luminous blue-white tendrils spreading across the sky, you may have spotted a noctilucent cloud.

Realtime NLC Photo Gallery

Realtime Sprite Photo Gallery

Realtime Aurora 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 Jun. 4, 2015, the network reported 10 fireballs.
(9 sporadics, 1 June mu Cassiopeiid)

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 June 4, 2015 there were potentially hazardous asteroids.
Recent & Upcoming Earth-asteroid encounters:
Miss Distance
2015 KW120
May 29
1.1 LD
27 m
2015 KH
May 29
14.3 LD
53 m
2015 KQ120
May 31
8.5 LD
20 m
2015 KM57
Jun 3
6.6 LD
34 m
2005 XL80
Jun 4
38.1 LD
1.0 km
2015 KA122
Jun 6
3.3 LD
101 m
2015 KU121
Jun 7
7.5 LD
109 m
2012 XB112
Jun 11
10.1 LD
2 m
2015 KK57
Jun 23
8.3 LD
13 m
2005 VN5
Jul 7
12.6 LD
18 m
2015 HM10
Jul 7
1.1 LD
73 m
1994 AW1
Jul 15
25.3 LD
1.4 km
2011 UW158
Jul 19
6.4 LD
565 m
2013 BQ18
Jul 20
7.9 LD
38 m
1999 JD6
Jul 25
18.8 LD
1.6 km
2005 NZ6
Aug 6
76.5 LD
1.4 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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