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SpaceWeather.com -- News and information about meteor showers, solar flares, auroras, and near-Earth asteroids
 
Solar wind
speed: 298.5 km/sec
density: 9.2 protons/cm3
more data: ACE, DSCOVR
Updated: Today at 2358 UT
X-ray Solar Flares
6-hr max: B2
1801 UT Dec03
24-hr: B2
1801 UT Dec03
explanation | more data
Updated: Today at: 2300 UT
Daily Sun: 03 Dec 16
All of these sunspots are stable and quiet. Solar flares are unlikely this weekend. Credit: SDO/HMI

Sunspot number: 59
What is the sunspot number?
Updated 03 Dec 2016

Spotless Days
Current Stretch: 0 days
2016 total: 25 days (7%)
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 03 Dec 2016


The Radio Sun
10.7 cm flux: 84 sfu
explanation | more data
Updated 03 Dec 2016

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
quiet
explanation | more data
Interplanetary Mag. Field
Btotal: 2.8 nT
Bz: -1.3 nT north
more data: ACE, DSCOVR
Updated: Today at 2358 UT
Coronal Holes: 03 Dec 16

A large coronal hole is emerging over the sun's southeastern limb. Credit: NASA/SDO.
Noctilucent Clouds The southern season for noctilucent clouds began on Nov. 17th. Come back to this spot every day to see the "daily daisy" from NASA's AIM spacecraft, which is monitoring the dance of electric-blue around the Antarctic Circle.
Switch view: Ross Ice Shelf, Antarctic Peninsula, East Antarctica, Polar
Updated at: 12-03-2016 16:55:02
SPACE WEATHER
NOAA Forecasts
Updated at: 2016 Dec 03 2200 UTC
FLARE
0-24 hr
24-48 hr
CLASS M
10 %
10 %
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: 2016 Dec 03 2200 UTC
Mid-latitudes
0-24 hr
24-48 hr
ACTIVE
20 %
10 %
MINOR
05 %
05 %
SEVERE
01 %
01 %
High latitudes
0-24 hr
24-48 hr
ACTIVE
15 %
15 %
MINOR
30 %
20 %
SEVERE
25 %
15 %
 
Saturday, Dec. 3, 2016
What's up in space
       
 

Bring in the New Year with Marianne's Arctic Xpress. Spend Christmas or New Year in a remote Norwegian cabin. Chase auroras every night or join a day tour to see fjords, whales, eagles and an abundance of wildlife. Book Now

 

SATURDAY NIGHT LIGHTS: Venus and the Moon are doing it again--putting on a show in the sunset sky. Look for them in the southwest just after sundown. If possible, go outside before the sky fades completely black. For reasons no scientist can explain, these two heavenly bodies are especially beautiful when surrounded by twilight blue. Sky maps: Dec. 2nd, 3rd.

WATCH OUT FOR THE DA VINCI GLOW: If you go outside tonight to witness the meeting of Venus and the crescent Moon, pay special attention to the Moon.  Cradled between the arms of the slender crescent is a display of light and shadow that puzzled sky watchers for thousands of years--until Leonardo da Vinci figured it out. It's the "Da Vinci glow,"  also known as Earthshine:

Richard Sears of Merced, California, took the picture last night. "I was getting ready for the Venus-Moon conjunction," he says.  "The Earthshine was gorgeous."

For much of human history, people marveled at the faint image of the full Moon inside the arms of the crescent. Where did it come from? No one knew until the 16th century when Leonardo figured it out.  He realized that dark lunar terrain was being illuminated by sunlight reflected from Earth.

Visualizing this in the 1500s required a wild kind of imagination. No one had ever been to the Moon and looked "up" at Earth. Most people didn't even know that Earth orbited the sun. Copernicus' sun-centered theory of the solar system wasn't published until 1543, twenty-four years after Leonardo died.


Above: Da Vinci's sketch of Earthshine in 1510 vs. Italian astronomer Riccardo Di Nasso's photo of Earthshine in 2006.

Wild imagination, however, was one thing Leonardo had in abundance. His notebooks are filled with sketches of flying machines, army tanks, scuba gear and other fantastic devices centuries ahead of their time.

In Leonardo's Codex Leicester, circa 1510, there is a page entitled "Of the Moon: No Solid Body is Lighter than Air." He states his belief that the "ghostly glow" is due to sunlight bouncing off Earth's oceans and, in turn, hitting the Moon.  500 years later, we know that Earth's clouds (not oceans) do most of the reflecting; but that is a quibble. Leonardo understood the basics well enough.

Go outside tonight and look to the sky. The Da Vinci Glow is waiting....

Realtime Space Weather Photo Gallery

LARGE CORONAL HOLE TURNING TOWARD EARTH: A large hole in the sun's atmosphere has formed and it is turning toward Earth. NASA's Solar Dynamics Observatory took this extreme ultraviolet image of the structure on Dec. 3rd:

This is a "coronal hole"--a region where the sun's magnetic field has opened up, allowing solar wind to escape.  A stream of solar wind emerging from this coronal hole could reach Earth as early as Dec. 7th and influence the near-space environment of our planet for several days. G1-class geomagnetic storms and high-latitude auroras are possible when the solar wind arrives.

Note: The forecast will improve in the days ahead as the hole rotates into better view, revealing its form and dimensions. Stay tuned!

Realtime Aurora Photo Gallery

FAR OUT STOCKING STUFFER: It's out of this world: the Sirius Space Pendant. To raise money for their space weather ballooning program, the students of Earth to Sky Calculus have flown 3 dozen pendants to the edge of space–and you can have one for $69.95. The pendant comes with a greeting card showing the jewelry in flight and certifying that it has been to the stratosphere and back again.

The pendants flew to the edge of space on Nov. 20, 2016, alongside an array of cosmic radiation sensors. (We're reducing the data now!) After the balloon exploded, the payload parachuted back to Earth, landing in the snowy San Antonio mountains north of Tonopah, Nevada, where a student team recovered it on Nov. 22nd.

The research of Earth to Sky Calculus is not supported by government grants or corporate donations. Instead, we are entirely crowd-funded. Proceeds from the sale of items like the Sirius Pendant go right back into cutting-edge student research. More edge of space Christmas gifts may be found in the Earth to Sky Store.


Realtime Sprite Photo Gallery


Realtime Airglow 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. 3, 2016, the network reported 23 fireballs.
(17 sporadics, 3 sigma Hydrids, 1 Geminid, 1 November I Draconid, 1 Puppids-Velid)

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 3, 2016 there were potentially hazardous asteroids.
Recent & Upcoming Earth-asteroid encounters:
Asteroid
Date(UT)
Miss Distance
Size
2016 WG7
Dec 1
2.6 LD
27 m
2016 WQ3
Dec 1
1.5 LD
8 m
2016 WB8
Dec 5
3.6 LD
30 m
2016 WD7
Dec 6
4.2 LD
16 m
2016 WH10
Dec 6
5.7 LD
26 m
2016 WQ8
Dec 8
5.1 LD
49 m
2015 YA
Dec 13
9.6 LD
15 m
2015 XX169
Dec 13
7.4 LD
15 m
2015 YQ1
Dec 21
6.2 LD
11 m
2006 BZ7
Dec 22
74.5 LD
1.4 km
2015 BB
Jan 18
13.8 LD
45 m
2002 LS32
Jan 24
53.9 LD
1.0 km
1991 VK
Jan 25
25.2 LD
1.9 km
2000 WN107
Jan 26
62.3 LD
2.8 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.
  Cosmic Rays in the Atmosphere

Readers, thank you for your patience while we continue to develop this new section of Spaceweather.com. We've been working to streamline our data reduction, allowing us to post results from balloon flights much more rapidly, and we have developed a new data product, shown here:

This plot displays radiation measurements not only in the stratosphere, but also at aviation altitudes. Dose rates are expessed as multiples of sea level. For instance, we see that boarding a plane that flies at 25,000 feet exposes passengers to dose rates ~10x higher than sea level. At 40,000 feet, the multiplier is closer to 50x. These measurements are made by our usual cosmic ray payload as it passes through aviation altitudes en route to the stratosphere over California.

What is this all about? 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. Furthermore, there are studies ( #1, #2, #3, #4) linking cosmic rays with cardiac arrhythmias and sudden cardiac death in the general population. Our latest measurements show that cosmic rays are intensifying, with an increase of more than 12% since 2015:


Why are cosmic rays intensifying? The main reason is the sun. Solar storm clouds such as coronal mass ejections (CMEs) sweep aside cosmic rays when they pass by Earth. During Solar Maximum, CMEs are abundant and cosmic rays are held at bay. Now, however, the solar cycle is swinging toward Solar Minimum, allowing cosmic rays to return. Another reason could be the weakening of Earth's magnetic field, which helps protect us from deep-space radiation.

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.

The data points in the graph above correspond to the peak of the Reneger-Pfotzer maximum, which lies about 67,000 feet above central California. When cosmic rays crash into Earth's atmosphere, they produce a spray of secondary particles that is most intense at the entrance to the stratosphere. Physicists Eric Reneger and Georg Pfotzer discovered the maximum using balloons in the 1930s and it is what we are measuring today.

  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
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