You are viewing the page for Dec. 26, 2015
  Select another date:
<<back forward>>
SpaceWeather.com -- News and information about meteor showers, solar flares, auroras, and near-Earth asteroids
 
Solar wind
speed: 562.5 km/sec
density: 3.1 protons/cm3
explanation | more data
Updated: Today at 2350 UT
X-ray Solar Flares
6-hr max: C1
1701 UT Dec26
24-hr: C7
0510 UT Dec26
explanation | more data
Updated: Today at: 2300 UT
Daily Sun: 26 Dec 15
Sunspot AR2473 has a 'beta-gamma' magnetic field that harbors energy for strong M-class solar flares. Credit: SDO/HMI

Sunspot number: 71
What is the sunspot number?
Updated 26 Dec 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 26 Dec 2015


The Radio Sun
10.7 cm flux: 133 sfu
explanation | more data
Updated 26 Dec 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
quiet
explanation | more data
Interplanetary Mag. Field
Btotal: 6.8 nT
Bz: 0.1 nT north
explanation | more data
Updated: Today at 2349 UT
Coronal Holes: 26 Dec 15

Earth is inside a stream of solar wind flowing from this southern coronal hole. Credit: SDO/AIA.
Noctilucent Clouds The southern season for noctilucent clouds is about to begin. Monitor the daily daisies, below, from NASA's AIM spacecraft for the first wisps of electric blue above Antarctica.
Switch view: Ross Ice Shelf, Antarctic Peninsula, East Antarctica, Polar
Updated at: 12-26-2015 15:55:02
SPACE WEATHER
NOAA Forecasts
Updated at: 2015 Dec 26 2200 UTC
FLARE
0-24 hr
24-48 hr
CLASS M
55 %
55 %
CLASS X
10 %
10 %
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 Dec 26 2200 UTC
Mid-latitudes
0-24 hr
24-48 hr
ACTIVE
35 %
30 %
MINOR
20 %
10 %
SEVERE
05 %
01 %
High latitudes
0-24 hr
24-48 hr
ACTIVE
10 %
15 %
MINOR
25 %
25 %
SEVERE
50 %
40 %
 
Saturday, Dec. 26, 2015
What's up in space
 

Marianne's Heaven On Earth Aurora Chaser Tours Chasethelighttours.co.uk 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 FLARES: Big sunspot AR2473 is directly facing Earth, and it has an unstable 'beta-gamma' magnetic field that harbors energy for strong explosions. NOAA forecasters estimate a 45% chance of M-class flares and a 10% chance of X-flares on Dec. 26th. Solar flare alerts: text or voice

THEY'RE BACK! POLAR STRATOSPHERIC CLOUDS: For the second time this month, sky watchers around the Arctic Circle are reporting an outbreak of colorful polar stratospheric clouds (PSCs). Patricia Cowern photographed them floating over Porjus, Sweden, just hours ago:

"As the sun went down, I could see some very white clouds in the distance," says Cowern. "When darkness fell, we could see the PSCs in full color."

Also known as "nacreous" or "mother of pearl" clouds, icy PSCs form in the lower stratosphere when temperatures drop to around minus 85ºC. That's how cold it has to be for ice crystals to form in the very dry stratosphere. High-altitude sunlight shining through tiny ice particles ~10µm across produce the characteristic bright iridescent colors by diffraction and interference. Once thought to be mere curiosities, some PSCs are now known to be associated with the destruction of ozone.

"Polar stratospheric clouds far outshine and have much more vivid colours than ordinary iridescent clouds, which are very much poor relations and seen frequently all over the world," writes atmospheric optics expert Les Cowley. "Once seen they are never forgotten."

The best time to look for PSCs is just before sunrise or right after sunset, when the ground is dark but the upper atmosphere is still illuminated by sunlight. Or, you can see them any time in the realtime photo gallery:

Realtime PSC Photo Gallery

ELECTRIC-BLUE CLOUDS SPREADING OVER ANTARCTICA: Noctilucent clouds (NLCs) around the south pole are spreading and brightening. The latest preliminary image from NASA's AIM spacecraft shows more than 10 times the coverage of just one week ago:

The season for southern hemisphere noctilucent clouds (NLCs) began on Dec. 13th with just a few puffy clouds over the frozen continent. Once NLCs first appear, AIM has shown that they rapidly multiply. Indeed, this is happening now, and much of Antarctica soon could be blanketed in electric blue.

Realtime Noctilucent Cloud Photo Gallery

ARMY OF GREEN MEN -- IN SPACE: On Dec. 20th, Spaceweather.com and the students of Earth to Sky Calculus launched their weekly helium balloon to measure cosmic radiation in Earth's atmosphere. This time, there were 56 hitchikers--a platoon of green army men:

Their mission: to raise awareness of spinal cord injuries. #QuaidsArmy sponsored the flight. On September 20th, 2013, twenty-four year old Quaid Mobus of Warren NJ was in a near fatal ATV accident the night before his sister's wedding. Quaid was left paralyzed, requiring extensive lifelong medical attention. Since then, the Army of Green Men have been traveling far and wide to support Quaid and others like him. Dec. 20th marked their first trip to the stratosphere. Learn more at http://www.armyofgreenmen.com/

Realtime Spaceweather Photo Gallery


Realtime Aurora Photo Gallery


Realtime Meteor 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 Spaceweather.com.

On Dec. 26, 2015, the network reported 22 fireballs.
(22 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 December 26, 2015 there were potentially hazardous asteroids.
Recent & Upcoming Earth-asteroid encounters:
Asteroid
Date(UT)
Miss Distance
Size
2015 XN261
Dec 23
2.6 LD
26 m
2015 YJ1
Dec 24
7.4 LD
14 m
2015 XX378
Dec 24
6.9 LD
49 m
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
2015 XV351
Dec 29
5.3 LD
28 m
2015 XC352
Dec 30
5.2 LD
30 m
2015 YT1
Dec 31
13.5 LD
17 m
2004 MQ1
Jan 2
55.4 LD
1.1 km
1999 JV6
Jan 6
12.6 LD
410 m
2015 YC2
Jan 15
4.9 LD
101 m
1685 Toro
Jan 22
60.9 LD
1.7 km
2001 XR1
Jan 23
74.4 LD
1.5 km
2015 VC2
Jan 28
5.8 LD
15 m
2015 XA379
Feb 6
7.7 LD
33 m
2013 VA10
Feb 7
8.5 LD
165 m
2014 QD364
Feb 7
14 LD
16 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, Spaceweather.com 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.
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
Synergy Spray Foam Insulation of Houston TX
  Protection from the Sun!
Kotton Grammer, Search Engine Marketing
  a sponsor of SpaceWeather.com
Columbia Northern High School
  Web-based high school science course with free enrollment
Heliophysics
  the underlying science of space weather
  more links...
©2015 Spaceweather.com. All rights reserved. This site is penned daily by Dr. Tony Phillips.
©2013 Spaceweather.com. All rights reserved.