Solar wind
speed: 270.0 km/sec
density: 1.8 protons/cm3
explanation | more data
Updated: Today at 0158 UT
X-ray Solar Flares
6-hr max: B4
1814 UT Nov24
24-hr: B6
0221 UT Nov24
explanation | more data
Updated: Today at: 2359 UT
Daily Sun: 24 Nov 15
Sunspot AR2457 has developed a 'beta-gamma' magnetic field that harbors energy for M-class solar flares. Credit: SDO/HMI

Sunspot number: 77
What is the sunspot number?
Updated 24 Nov 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 24 Nov 2015

The Radio Sun
10.7 cm flux: 120 sfu
explanation | more data
Updated 24 Nov 2015

Current Auroral Oval:
Switch to: Europe, USA, New Zealand, Antarctica
Credit: NOAA/Ovation
Planetary K-index
Now: Kp= 0 quiet
24-hr max: Kp= 1
explanation | more data
Interplanetary Mag. Field
Btotal: 3.0 nT
Bz: 0.9 nT north
explanation | more data
Updated: Today at 0158 UT
Coronal Holes: 24 Nov 15

There are no large coronal holes on the Earthside of the sun. Credit: SDO/AIA.
Noctilucent Clouds The northern season for NLCs is finished. According to NASA's AIM spacecraft, the last clouds were observed over Greenland on Aug. 27th. Now the waiting begins for the southern season expected to begin in November.
Switch view: Ross Ice Shelf, Antarctic Peninsula, East Antarctica, Polar
Updated at: 11-24-2015 22:55:03
NOAA Forecasts
Updated at: 2015 Nov 24 2200 UTC
0-24 hr
24-48 hr
15 %
10 %
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 Nov 24 2200 UTC
0-24 hr
24-48 hr
30 %
25 %
10 %
05 %
01 %
01 %
High latitudes
0-24 hr
24-48 hr
15 %
15 %
30 %
30 %
40 %
30 %
Wednesday, Nov. 25, 2015
What's up in space

Marianne's Heaven On Earth Aurora Chaser Tours invites you to join them in their quest to find and photograph the Aurora Borealis. Experience the winter wonderland in the Tromsø Area.

Chase the Light Tours

CHANCE OF MINOR STORMS: NOAA forecasters estimate a 40% chance of minor geomagnetic storms on Nov. 25th when a solar wind stream is expected to hiy Earth's magnetic field. High-latitude sky watchers could see auroras through the glare of the waxing full Moon. Aurora alerts: text or voice

JAPANESE ROCKET SURPRISES SKY WATCHERS: Unbeknownst to most people in North America this morning, Japan launched an H-2A rocket carrying the Telstar 12 Vantage communications satellite. The resulting display surprised sky watchers in at least half a dozen states. "I was observing Comet Catalina before sunrise, when I noticed this thing halfway up towards Venus," reports Glen Wurden of Los Alamos, New Mexico:

"It lasted for at least a half an hour after 5:40 AM," he adds. "It was huge, easily naked eye, and kind of scary!"

The cloud was a fuel dump from one of the rocket's booster stages. Lingering high in the pre-dawn sky until sunrise wiped it away, it was seen from Nevada, Arizona, New Mexico and neighboring states.

SUNRISE COMET CATALINA: Discovered in 2013 by the Catalina Sky Survey, Comet Catalina (C/2013 US10) is making a one-time trip through the inner solar system. It swung around the sun on Nov. 15th and is now emerging in the dawn skies of the northern hemisphere. Peter Rosén photographed the comet over Stockholm, Sweden, on Nov. 23rd:

"I woke up very early this morning to catch a first glimpse of comet Catalina," says Rosén. "While I waited for the comet to appear in the sunrise twilight, I spent my time observing Venus and Jupiter. As so often happens in Stockholm, the clouds rolled in and started covering the sky. I thought about giving up, but I noticed that there was still a strip of clear sky at the eastern horizon. Patience payed off and Comet Catalina even showed a thin tail at less than 3° above the horizon."

Technically, Comet Catalina is a 6th magnitude object visible to the unaided eye. In practice, morning twilight overwhelms the comet's faint glow. You need a telescope to see it. "The inset is shot with a Canon Eos5D through my WilliamOptics FLT-110 at prime focus," says Rosén. Sky maps and observing tips are available from Sky & Telescope.

This is Comet Catalina's first visit to the inner solar system--and its last. The comet's close encounter with the sun in mid-November has placed it on a slingshot trajectory toward interstellar space. It will become easier to see in the weeks ahead as it recedes from the sun, possibly brightening to 5th magnitude in December. A date of special interest is Dec. 7th when the comet pairs up with the planet Venus and the waning crescent Moon in the early morning sky. Catalina will be about 4o degrees away from the Venus-Moon combo. Stay tuned for more information about that, and meanwhile browse the realtime comet gallery for more sightings.

Realtime Comet Photo Gallery

AURORAS, FOR NO PARTICULAR REASON: Nov. 21st was a day of quiet space weather. There were no intense solar flares, no CMEs, and no geomagnetic storms. The auroras appeared anyway. Liselotte Kahns saw them over Sweden's Abisko National Park:

"Despite the extremely low level of solar activity, Abisko's clear sky demonstrated a nice aurora display tonight," says Kahns. "[It's] a good illustration of why this place is rated as one of the best places on Earth to see auroras."

Indeed, it is not unusual for auroras to appear over Abisko even when the forecast calls for no magnetic activity. Aurora tour guides and photographers naturally gravitate toward the Park because of its frequently-green skies. The reason is Abisko's location beneath Earth's persistent auroral oval. A gentle rain of solar wind electrons, guided to Earth by our planet's curved magnetic field, creates a polar ring of Northern Lights that intersects the latitude of Abisko, more often than not. Browse the realtime gallery for more sightings:

Realtime Aurora Photo Gallery

Realtime Space Weather Photo Gallery

Realtime Noctilucent Cloud Photo Gallery

Realtime Meteor 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 Nov. 24, 2015, the network reported 54 fireballs.
(42 sporadics, 7 Leonids, 2 Northern Taurids, 2 Geminids, 1 Quadrantid)

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 November 25, 2015 there were 1637 potentially hazardous asteroids.
Recent & Upcoming Earth-asteroid encounters:
Miss Distance
2015 WP2
Nov 20
0.6 LD
5 m
2005 UL5
Nov 20
5.9 LD
390 m
2015 WC1
Nov 20
9.7 LD
40 m
2015 VE66
Nov 21
7.5 LD
63 m
2015 WZ1
Nov 22
1.6 LD
5 m
2015 VO142
Nov 24
1 LD
7 m
2015 VH2
Nov 24
12.9 LD
14 m
2003 EB50
Nov 29
48.8 LD
2.2 km
2007 BG29
Dec 1
54.1 LD
1.1 km
2015 VZ145
Dec 8
9.2 LD
80 m
1998 WT24
Dec 11
10.9 LD
1.1 km
2011 YD29
Dec 24
9.7 LD
24 m
2003 SD220
Dec 24
28.4 LD
1.8 km
2008 CM
Dec 29
22.8 LD
1.5 km
2004 MQ1
Jan 2
55.4 LD
1.1 km
1999 JV6
Jan 6
12.6 LD
410 m
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.
  Cosmic Rays in the Atmosphere
Situation Report -- Oct. 30, 2015 Stratospheric Radiation (+37o N)
Cosmic ray levels are elevated (+6.1% above the Space Age median). The trend is flat. Cosmic ray levels have increased +0% in the past month.
Sept. 06: 4.14 uSv/hr (414 uRad/hr)
Sept. 12: 4.09 uSv/hr (409 uRad/hr)
Sept. 23: 4.12 uSv/hr (412 uRad/hr)
Sept. 25: 4.16 uSv/hr (416 uRad/hr)
Sept. 27: 4.13 uSv/hr (413 uRad/hr)
Oct. 11: 4.02 uSv/hr (402 uRad/hr)
Oct. 22: 4.11 uSv/hr (411 uRad/hr)
These measurements are based on regular space weather balloon flights: learn more.

Approximately once a week, and the students of Earth to Sky Calculus fly "space weather balloons" to the stratosphere over California. These balloons are equipped with radiation sensors that detect cosmic rays, a surprisingly "down to Earth" form of space weather. Cosmic rays can seed clouds, trigger lightning, and penetrate commercial airplanes. Our measurements show that someone flying back and forth across the continental USA, just once, can absorb as much ionizing radiation as 2 to 5 dental X-rays. Here is the data from our latest flight, Oct. 22nd:

Radiation levels peak at the entrance to the stratosphere in a broad region called the "Pfotzer Maximum." This peak is named after physicist George Pfotzer who discovered it using balloons and Geiger tubes in the 1930s. Radiation levels there are more than 80x sea level.

Note that the bottom of the Pfotzer Maximim is near 55,000 ft. This means that some high-flying aircraft are not far from the zone of maximum radiation. Indeed, according to the Oct 22th measurements, a plane flying at 45,000 feet is exposed to 2.79 uSv/hr. At that rate, a passenger would absorb about one dental X-ray's worth of radiation in about 5 hours.

The radiation sensors onboard our helium balloons detect X-rays and gamma-rays in the energy range 10 keV to 20 MeV. These energies span the range of medical X-ray machines and airport security scanners.

  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
Synergy Spray Foam Insulation of Houston TX
  Protection from the Sun!
  more links...
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