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SpaceWeather.com -- News and information about meteor showers, solar flares, auroras, and near-Earth asteroids
 
Solar wind
speed: 611.6 km/sec
density: 11.1 protons/cm3
more data: ACE, DSCOVR
Updated: Today at 2348 UT
X-ray Solar Flares
6-hr max: A9
2247 UT Oct24
24-hr: A9
2247 UT Oct24
explanation | more data
Updated: Today at: 2300 UT
Daily Sun: 24 Oct 17
Neither of these sunspots poses a threat for strong solar flares.  Credit: SDO/HMI

Sunspot number: 23
What is the sunspot number?
Updated 24 Oct 2017

Spotless Days
Current Stretch: 0 days
2017 total: 68 days (23%)
2016 total: 32 days (9%)
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 Oct 2017


The Radio Sun
10.7 cm flux: 78 sfu
explanation | more data
Updated 24 Oct 2017

Current Auroral Oval:
Switch to: Europe, USA, New Zealand, Antarctica
Credit: NOAA/Ovation
Planetary K-index
Now: Kp= 3 quiet
24-hr max: Kp= 5
storm
explanation | more data
Interplanetary Mag. Field
Btotal: 7.7 nT
Bz: -5.9 nT south
more data: ACE, DSCOVR
Updated: Today at 2348 UT
Coronal Holes: 24 Oct 17

Solar wind flowing from this coronal hole should reach Earth on Oct. 24-25. Credit: NASA/SDO.
Noctilucent Clouds Latest images from NASA's AIM spacecraft show that the 2017 northern summer season for noctilucent clouds has finished.
Switch view: Europe, USA, Asia, Polar
Updated at: 09-03-2017 01:55:03
SPACE WEATHER
NOAA Forecasts
Updated at: 2017 Oct 24 2200 UTC
FLARE
0-24 hr
24-48 hr
CLASS M
01 %
01 %
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: 2017 Oct 24 2200 UTC
Mid-latitudes
0-24 hr
24-48 hr
ACTIVE
30 %
35 %
MINOR
35 %
25 %
SEVERE
20 %
15 %
High latitudes
0-24 hr
24-48 hr
ACTIVE
05 %
10 %
MINOR
15 %
25 %
SEVERE
75 %
55 %
 
Tuesday, Oct. 24, 2017
What's up in space
       
 

All-inclusive Northern Lights trips in Tromsø, Norway. Small groups, big experiences! Highly qualified guides ensure unique and unforgettable adventures with a personal touch. Visit Explore the Arctic

 

CHANCE OF STORMS TODAY: NOAA forecasters estimate a 65% chance of G1-class geomagnetic storms later today when a fast-moving stream of solar wind makes contact with Earth's magnetic field. Tomorrow could be even stormier.  There is a 75% chance of G1-class storms with periods of moderate G2-class storming on Oct. 25th. High-latitude sky watchers should be alert for auroras. Free: Aurora Alerts.

NOISY AURORAS: On Oct. 23rd, the night sky above Tromsø, Norway, exploded in a twisted spray of green auroras. Tour guide Markus Varik knew something was happening without even looking up. "The electric wires were going bananas with crackling sounds," he explains. "We could literally hear the storm."

For centuries, Arctic sky watchers have reported hearing aurora sounds: claps, crackles, hissing, even "blaster fire." They are most often heard during intense geomagnetic activity. The underlying physics is still controversial, but the menagerie of sounds appears to be real.

"For me, it's not unusual to hear auroras, as I work with the Northern Lights tours on a regular basis," says Varik. "Typically, the volume waxes and wanes with the brightness of the aurora. I heard especially loud sounds during the major solar storm of March 17, 2015. It was so strong, it felt like it was coming from my bones!"

"The sounds I have heard are pretty similar to the ones [reported by Oliver Wright in Sweden]," he says. "The closest other natural sound I can think of is when you step on ice and it cracks. Or if there is a frozen part of the sea and the tide is going out, making it collapse a bit and releasing this specific sound."

"This week I will take an audio recorder out with me and try to capture some samples," says Varik. Stay tuned for that.

Realtime Aurora Photo Gallery

OPALITE CRYSTAL SPACE PENDANT: On Oct. 15, 2017, the students Earth to Sky Calculus launched a space weather balloon from the Sierra Nevada mountains of central California. Its mission: to measure cosmic rays at the top of Earth's atmosphere. The payload carried an array of X-ray/gamma-ray detectors, GPS trackers, temperature/pressure sensors and, for fundraising, opalite crystals:

With a soothing blue glow that matches the otherworldly color of Earth's upper atmosphere, these crystals ascended to an altitude of 32 km (105,000 feet) where the balloon exploded. The payload parachuted back to Earth, landing in the Eureka Valley on the outskirts of Death Valley National Park.

You can have one for $119.95. Each necklace comes with a unique gift card showing the pendant floating at the top of Earth's atmosphere. The interior of the card tells the story of the flight and confirms that this gift has been to the edge of space and back again.

Far Out Gifts: Earth to Sky Store
All proceeds support hands-on STEM education

ATMOSPHERIC CANYON ON THE SUN: A large hole has opened in the sun's atmosphere, cleaving the Earth-facing side of the sun with a gaseous canyon more than 700,000 km long. This image, based on data from NASA's Solar Dynamics Observatory, shows the jagged structure directly facing Earth on Oct. 22nd:


This is a coronal hole--a region where the sun's magnetic field peels back and allows solar wind to escape. The solar wind emerging from this hole is blowing faster than 600 km/s and is expected to reach Earth during the late hours of Oct. 24th. NOAA forecasters say there is a 65% chance of polar geomagnetic storms on Oct. 24th, increasing to 75% on Oct. 25th. Arctic auroras are in the offing. Free: Aurora Alerts.

Realtime Space Weather Photo Gallery

WANTED: TALES OF SPOOKY SPACE WEATHER: Have you ever been spooked by something you saw in the night sky? Maybe it was a ghoulish form in the aurora borealis, or the haunting glow of a rocket fuel dump--or something you couldn't figure out at all! In the spirit of Halloween, Spaceweather.com is reaching out to you, our readers, to share a spooky story about the night sky. Fill out this short survey, and your tale could end up on the front page of our web site as Halloween approaches. (Note: Image and audio files are accepted by the survey form.)


  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 Oct. 24, 2017, the network reported 117 fireballs.
(74 sporadics, 35 Orionids, 3 Southern Taurids, 2 epsilon Geminids, 1 Leonis Minorid, 1 chi Taurid, 1)

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 October 24, 2017 there were 1847 potentially hazardous asteroids.
Recent & Upcoming Earth-asteroid encounters:
Asteroid
Date(UT)
Miss Distance
Velocity (km/s)
Diameter (m)
2017 UJ
2017-Oct-19
2.8 LD
12
27
2017 TG2
2017-Oct-19
19.9 LD
19.2
168
2017 TD6
2017-Oct-19
0.5 LD
9.2
13
2017 TA6
2017-Oct-19
6.7 LD
4.4
16
2017 UG
2017-Oct-20
4.3 LD
10.6
11
2017 SY20
2017-Oct-20
19 LD
7.2
47
2017 UJ2
2017-Oct-20
0 LD
8.5
2
2017 UP
2017-Oct-20
6.6 LD
14.3
21
2017 TO2
2017-Oct-20
13.9 LD
13.7
79
2017 SH14
2017-Oct-20
15.4 LD
6.9
45
2017 UH1
2017-Oct-21
5 LD
21.9
23
2017 TG4
2017-Oct-21
4.8 LD
11.4
51
2017 UM1
2017-Oct-21
7 LD
17.3
26
2017 TC5
2017-Oct-21
15.6 LD
8.3
20
2017 TV5
2017-Oct-22
3.4 LD
10.7
15
171576
2017-Oct-22
5.8 LD
21.2
677
2017 TQ5
2017-Oct-22
5.5 LD
5.8
11
2017 UQ2
2017-Oct-22
6 LD
16.2
25
2017 TQ4
2017-Oct-22
11.2 LD
11
38
2017 UC3
2017-Oct-22
16.1 LD
31.1
104
2017 US
2017-Oct-22
7.5 LD
4.1
23
2017 TK6
2017-Oct-23
19.3 LD
11.7
46
2017 UU2
2017-Oct-24
2.1 LD
11.3
19
2017 UK3
2017-Oct-24
1.4 LD
13.3
13
2017 UH
2017-Oct-25
15.1 LD
11
21
2017 UE3
2017-Oct-25
4.7 LD
15.1
29
2017 TL4
2017-Oct-25
14.7 LD
11.4
48
2017 UG3
2017-Oct-25
12.4 LD
5.3
13
2017 TZ4
2017-Oct-31
19.3 LD
13.1
98
2003 UV11
2017-Oct-31
15 LD
24.5
447
2017 UO2
2017-Oct-31
11 LD
8.7
21
2017 TZ3
2017-Nov-09
10.3 LD
8.7
37
444584
2017-Nov-17
8.7 LD
14.8
324
2008 WM61
2017-Dec-03
3.8 LD
4.7
16
2015 XX169
2017-Dec-14
9.7 LD
6.3
11
2011 YD29
2017-Dec-19
17.6 LD
7.7
20
2006 XY
2017-Dec-20
6.5 LD
5
56
418849
2017-Dec-22
15.3 LD
17.4
257
2017 TS3
2017-Dec-22
18.2 LD
10.3
136
2015 YQ1
2017-Dec-22
17.3 LD
11.1
9
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 13% 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
NOAA 27-Day Space Weather Forecasts
  fun to read, but should be taken with a grain of salt! Forecasts looking ahead more than a few days are often wrong.
Aurora 30 min forecast
  from the NOAA Space Environment Center
Heliophysics
  the underlying science of space weather
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