Solar wind
speed: 462.0 km/sec
density: 3.64 protons/cm3 more data: ACE, DSCOVR Updated: Today at 1018 UT
X-ray Solar Flares
6-hr max: C1
0920 UT
Apr07
24-hr:
C1
0920 UT
Apr07 explanation
| more
data Updated: Today at: 1020 UT
Daily Sun: 07 Apr 26
Expand:labels | no labels
Solar flares are unlikely today.All of these sunspots have stable magnetic fields with a low chance of explosions. Credit: NASA/SDO
Planetary K-index
Now: Kp=
2.00 quiet
24-hr max: Kp= 3.33 quiet explanation | more
data
Interplanetary Mag. Field
Btotal: 3.45 nT
Bz: 1.84 nT north more data: ACE, DSCOVR Updated: Today at 1017 UT
Coronal Holes: 07 Apr 26
Solar wind flowing from this narrow coronal hole could reach Earth on April 8-9.Credit: NASA/SDO | more data
Spotless Days Current Stretch: 0 days
2026 total: 3 days (4%)
2025 total: 0 days (0%)
2024 total: 0 days (0%)
2023 total: 0 days (0%)
2022 total: 1 day (<1%)
2021 total: 64 days (18%)
2020 total: 208 days (57%)
2019 total: 281 days (77%)
2018 total: 221 days (61%)
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%)
2008 total: 268 days (73%)
2007 total: 152 days (42%)
2006 total: 70 days (19%)
Updated 07 Apr 2026
Thermosphere Climate Index
today: 18.37x1010W Warm
Max: 49.4x1010 W Hot (10/1957)
Min: 2.05x1010 W Cold (02/2009) explanation | more data:gfx, txt
Updated 06 Apr 2026
Cosmic RaysSolar Cycle 25 is near its peak, and this is reflected in the number of cosmic rays entering Earth's atmosphere. Neutron counts from the University of Oulu's Sodankyla Geophysical Observatory show that cosmic rays reaching Earth are slowly declining--a result of the yin-yang relationship between the solar cycle and cosmic rays.
Oulu Neutron Counts Percentages of the Space Age average:
today: -7.2% Low
48-hr change: -0.2%
Max: +11.7% Very High (12/2009)
Min: -32.1% Very Low (06/1991) explanation |more data
Updated 24 Mar 2026 @ 0700 UT
SPACE WEATHER NOAA Forecasts
Updated at: 2026 Apr 06 2200 UTC
FLARE
0-24
hr
24-48
hr
CLASS M
40
%
40
%
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: 2026 Apr 06 2200 UTC
Mid-latitudes
0-24
hr
24-48
hr
ACTIVE
15
%
10
%
MINOR
05
%
01
%
SEVERE
01
%
01
%
High latitudes
0-24
hr
24-48
hr
ACTIVE
15
%
15
%
MINOR
25
%
20
%
SEVERE
25
%
20
%
Tuesday, Apr. 7, 2026
What's up in space
This is an AI Free Zone: AI is everywhere -- except here. Spaceweather.com is written by Dr. Tony Phillips, a carbon-based lifeform with 30 yrs of forecasting experience. If you find a mistake, rest assured it was made by a real human being.
ASTRONAUTS JUST SAW METEOROIDS HIT THE MOON: The crew of Artemis II were giddy (their words!) on the evening of April 6th when they witnessed explosions on the lunar surface. Meteoroids were hitting the Moon. "We saw at least five," reported mission commander Reid Wiseman.
The meteors appeared in middle of a solar eclipse. About an hour after the crew made their closest approach to the farside of the Moon, the sun disappeared behind the lunar disk, giving the astronauts a chance to view the first solar eclipse ever seen by humans from behind the Moon.
The sun's corona surrounded the Moon and was visible "for at least 10 solar diameters from the lunar limb," according to Canadian astronaut Jeremy Hansen. This allowed mission specialist Christina Koch to photograph mountains and other topography silhouetted by the sun's atmosphere along a wide arc of the Moons edge.
The lunar meteors were a complete surprise. "We're seeing them near and south of the Moon's equator," reported Wiseman during the live webcast. Later, his crewmate Victor Glover spotted one near the Moon's South Pole.
Lunar meteors are different than Earth meteors. Here on Earth, meteoroids burn up in the atmosphere. On the airless Moon, they slam into the surface, creating an explosion amounting to many kilotons of TNT. NASA has been monitoring these impacts since 2006, logging about 20 per year on average. The crew of Artemis II saw 5 or 6 in a single hour.
The Moon was mostly dark during the eclipse and meteor shower, but not completely dark. The soft glow of Earth itself was cast across the lunar terrain. "The Earthshine is unreal," reported Wiseman. "Humans have not evolved to see what we are seeing. It's hard to describe. It's amazing!"
Indeed. The crew is downloading their photos to Earth now — including Koch's eclipse sequence -- and some of them will be released during NASA's April 7th press conference currently scheduled for 4:00 pm EDT. Prepare to be amazed.
NATURAL MOONSTONE CELTIC LOVE KNOT PENDANT: Nothing says "I love you" like a natural moonstone from the edge of space. On June 12th, the students of Earth to Sky Calculus flew this one 111,877 feet above Earth's surface onboard a cosmic ray research balloon:
You can have it for $159.95. The moonstone is wrapped in a sterling silver Celtic love knot and suspended from a matching 18-inch sterling silver chain. It spend more than two hours at the top of Earth's atmosphere before parachuting to a landing site in Death Valley National Park.
The students are selling space pendants to support their cosmic ray ballooning program. Each one comes with a greeting card showing the item in flight and telling the story of its journey to the edge of space.
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 April 06, 2026, the network reported 4 fireballs.
(4 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 April 7, 2026 there were 2349 potentially hazardous asteroids.
Notes: LD means
"Lunar Distance." 1 LD = 384,401 km, the distance
between Earth and the Moon. 1 LD also equals 0.00256
AU.
Cosmic Rays in the Atmosphere
SPACE WEATHER BALLOON DATA: Almost 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 sensors that detect secondary cosmic rays, a form of radiation from space that can penetrate all the way down to Earth's surface. Our monitoring program has been underway without interruption for 10 years, resulting in a unique dataset of in situ atmospheric measurements.
Latest results (Nov. 2024): Atmospheric radiation is sharply decreasing in 2024. Our latest measurements in November registered a 10-year low:
What's going on? Ironically, the radiation drop is caused by increasing solar activity. Solar Cycle 25 has roared to life faster than forecasters expected. The sun's strengthening and increasingly tangled magnetic field repels cosmic rays from deep space. In addition, solar coronal mass ejections (CMEs) sweep aside cosmic rays, causing sharp reductions called "Forbush Decreases." The two effects blend together to bring daily radiation levels down.
.Who cares? Cosmic rays are a surprisingly "down to Earth" form of space weather. They can alter the chemistry of the atmosphere, trigger lightning, and penetrate commercial airplanes. According to a study from the Harvard T.H. Chan school of public health, crews of aircraft have higher rates of cancer than the general population. The researchers listed cosmic rays, irregular sleep habits, and chemical contaminants as leading risk factors. A number of controversial studies (#1, #2, #3, #4) go even further, linking cosmic rays with cardiac arrhythmias and sudden cardiac death.
Technical notes: 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.
Data points in the graph labeled "Stratospheric Radiation" correspond to the peak of the Regener-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 Regener and Georg Pfotzer discovered the maximum using balloons in the 1930s and it is what we are measuring today.
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