Solar wind
speed: 325.8 km/sec
density: 1.0 protons/cm3
more data: ACE, DSCOVR
Updated: Today at 1427 UT
X-ray Solar Flares
6-hr max: A7
1219 UT Apr25
24-hr: A8
0733 UT Apr25
explanation | more data
Updated: Today at: 1400 UT
Daily Sun: 24 Apr 18
Sunspot AR2706 has a stable magnetic field that poses no threat for strong solar flares. Credit: SDO/HMI

Sunspot number: 19
What is the sunspot number?
Updated 24 Apr 2018

Spotless Days
Current Stretch: 0 days
2018 total: 67 days (59%)
2017 total: 104 days (28%)
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 Apr 2018


The Radio Sun
10.7 cm flux: 74 sfu
explanation | more data
Updated 24 Apr 2018

Current Auroral Oval:
Switch to: Europe, USA, New Zealand, Antarctica
Credit: NOAA/Ovation
Planetary K-index
Now: Kp= 1 quiet
24-hr max: Kp= 2
quiet
explanation | more data
Interplanetary Mag. Field
Btotal: 2.4 nT
Bz: 0.3 nT north
more data: ACE, DSCOVR
Updated: Today at 1427 UT
Coronal Holes: 24 Apr 18

Solar wind flowing from this northern coronal hole might graze Earth's magnetic field on April 26th. Credit: SDO/AIA
Noctilucent Clouds Our connection with NASA's AIM spacecraft has been restored! New images from AIM show that the southern season for noctilucent clouds (NLCs) is underway. Come back to this spot every day to see AIM's "daily daisy," which reveals the dance of electric-blue NLCs around the Antarctic Circle..
Switch view: Ross Ice Shelf, Antarctic Peninsula, East Antarctica, Polar
Updated at: 02-07-2018 17:55:05
SPACE WEATHER
NOAA Forecasts
Updated at: 2018 Apr 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: 2018 Apr 24 2200 UTC
Mid-latitudes
0-24 hr
24-48 hr
ACTIVE
10 %
20 %
MINOR
01 %
05 %
SEVERE
01 %
01 %
High latitudes
0-24 hr
24-48 hr
ACTIVE
15 %
20 %
MINOR
15 %
25 %
SEVERE
10 %
20 %
 
Wednesday, Apr. 25, 2018
What's up in space
       
 

Lights Over Lapland is excited to announce that our aurora webcam will be up and running 365 days per year! You can now enjoy watching the Midnight Sun and all of the other drama in the sky above Abisko National Park, Sweden here.

 

INCOMING SOLAR WIND STREAM: A stream of solar wind is approaching Earth and it could graze our planet's magnetic field on April 26th or 27th. The gaseous material is flowing from a northern hole in the sun's atmosphere. The stream won't hit our planet head on, but sometimes grazing impacts produce interesting effects--for instance, making Earth's magnetosphere ring like a bell. Free: Aurora Alerts

HURRICANE SPRITES: Atlantic hurricane season is little more than 1 month away. On the island of Puerto Rico, Frankie Lucena is looking forward to the coming storms with a mixture of excitement and dread. He's still struggling to keep regular power supplied to his private observatory 7 months after Hurricane Maria devastated the island last season.  At the same time he knows that passing storms produce something he loves to observe: sprites and gigantic jets.

"Tropical storm (later hurricane) Harvey was by far the most prolific," he recalls. Here are four of the upward-lancing forms he photographed when the storm swirled south of Puerto Rico on Aug. 19, 2017:

"Harvey was a 'TLE Paradise' that night, playing host to wide variety of Transient Luminous Events," says Lucena. "The four events pictured above occurred within a 1 hour period and they were conveniently placed, so I decided to stack them. The one at the extreme left is a sprite, and the rest are Gigantic Jet lightning events."

Lucena's photos of "hurricane sprites" are a testament to his dedication and resourcefulness. After Hurricane Maria knocked out power to Puerto Rico last year, he continued taking pictures, powering his cameras using a gasoline generator and a backup battery. "I wish I had solar power at my house because the lines for gasoline were very long and money spent on it really hurt the pocket. We went 82 days without power," he adds.

How severe storms produce sprites and jets is an area of cutting edge research--and the data are not easy to obtain. The 2018 hurricane season is expected to bring another battery of storms. Lucena would like to avoid another direct hit but, he says, "bring on the sprites."

Realtime Sprite Photo Gallery

RADIO STORM ON JUPITER: Yesterday, a radio storm happened on Jupiter. Astronomers have known since 1954 that the giant planet sometimes produces powerful bursts of shortwave static. Thomas Ashcraft recorded such a burst on April 24th using his amateur radio telescope in New Mexico. Click to hear the crackling "swooshes" that filled his observatory during the 2 hour storm:

"It was one of the better storms of the year so far," says Ashcraft. "In the audio specimen you can hear the emissions on two of my shortwave radios. One radio is tuned to 21.1 MHz and the other at 18.9 MHz." (Plug stereo headphones into your computer; they will separate the two frequencies into left and right ears.)

Radio storms on Jupiter come from natural radio lasers in the giant planet's magnetosphere. Electrical currents flowing between Jupiter's upper atmosphere and the volcanic moon Io can boost these emissions to power levels easily detected by ham radio antennas on Earth.

Jupiter's outbursts could become more intense in the weeks ahead. Why? Because the distance between Jupiter and Earth is shrinking to a minimum on May 10th. "As Jupiter passes closer to Earth in our orbits, the periodic Io-induced radio storms should get stronger," notes Ashcraft.

To learn more about radio storms on Jupiter, and how you can observe them yourself, visit NASA's RadioJove web site.

Realtime Space Weather Photo Gallery

FAR-OUT MOTHER'S DAY GIFT: Nothing says "I Love You" like a heart-shaped pendant from the edge of space. On Dec. 31, 2017, the students of Earth to Sky Calculus flew an array of cosmic ray sensors to the stratosphere onboard a giant helium balloon. This pendant went along for the ride:

You can have it for $119.95. The students are selling these pendants as a fund-raiser for their cosmic ray monitoring program--and they make great Mother's Day gifts. All proceeds support atmospheric radiation measurements and hands-on STEM education.

Each pendant comes with a greeting card showing the jewelry in flight and telling the story of its journey to the stratosphere and back again. Mom-satisfaction guaranteed.

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


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 Spaceweather.com.

On Apr. 24, 2018, the network reported 26 fireballs.
(18 sporadics, 8 April Lyrids)

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 April 25, 2018 there were 1907 potentially hazardous asteroids.
Recent & Upcoming Earth-asteroid encounters:
Asteroid
Date(UT)
Miss Distance
Velocity (km/s)
Diameter (m)
2018 HO1
2018-Apr-19
11.2 LD
7.3
30
2018 HC1
2018-Apr-19
1.2 LD
15.5
16
2018 HS
2018-Apr-20
5.1 LD
18.9
35
2018 GS3
2018-Apr-20
8.5 LD
19.8
24
2016 JP
2018-Apr-20
12 LD
12.7
214
2018 HT
2018-Apr-21
7.1 LD
7.6
15
2018 HL1
2018-Apr-21
4.7 LD
14.4
53
2018 GR1
2018-Apr-21
18.3 LD
16.4
52
2018 HN
2018-Apr-21
8 LD
9.8
37
2018 HW1
2018-Apr-21
0.9 LD
5
21
2018 HX1
2018-Apr-22
2.7 LD
25
44
2018 HV
2018-Apr-22
0.4 LD
16
6
2018 GG4
2018-Apr-23
9.8 LD
14.9
20
2018 HY1
2018-Apr-23
9.5 LD
7.6
31
2012 XL16
2018-Apr-23
15.8 LD
6.1
28
2018 GH
2018-Apr-25
14.6 LD
10.7
89
2018 HP
2018-Apr-26
11.6 LD
10.3
20
2018 GH5
2018-Apr-27
12.2 LD
12.7
32
2018 GB2
2018-Apr-27
17.1 LD
14.6
92
2013 US3
2018-Apr-29
10.1 LD
7.7
214
2018 GO4
2018-Apr-29
11.8 LD
8.6
43
2018 GY1
2018-Apr-29
13.2 LD
16.7
139
2018 FV4
2018-Apr-29
17.7 LD
6.5
59
2002 JR100
2018-Apr-29
10.8 LD
7.7
49
2018 HB1
2018-May-02
10.1 LD
9.2
40
2018 HR1
2018-May-04
17.2 LD
16.3
48
1999 FN19
2018-May-07
9.7 LD
5.7
118
2016 JQ5
2018-May-08
6.3 LD
10.4
9
388945
2018-May-09
6.5 LD
9
295
2018 GR2
2018-May-11
13.4 LD
9.8
109
1999 LK1
2018-May-15
13.3 LD
10
141
2018 GL1
2018-May-18
14.3 LD
5.2
67
68347
2018-May-29
9.5 LD
13.3
389
2013 LE7
2018-May-31
17.8 LD
1.7
12
2018 EJ4
2018-Jun-10
5.6 LD
6.2
195
2015 DP155
2018-Jun-11
9 LD
4.4
170
2017 YE5
2018-Jun-21
15.6 LD
15.5
513
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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