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CHANCE OF MINOR STORMS: NOAA forecasters say there is a 40% chance of minor G1-class geomagnetic storms on June 25th when a solar wind stream is expected to reach Earth. High-latitude sky watchers should be alert for auroras, especially in the southern hemisphere where dark winter skies favor visibility.
SUNSPOTS VANISHING, AGAIN: For the second time this month, the solar disk is blank--no sunspots. This image of the sun taken by NASA's Solar Dynamics Observatory on June 24th shows zero dark cores:
What does this mean? The solar cycle is like a pendulum, swinging back and forth between periods of high and low sunspot number every 11 years. Today's blank sun is a sign that the pendulum is swinging toward low sunspot numbers. In other words, Solar Minimum is coming.
Forecasters expect the next Solar Minimum to arrive in 2019-2020. Between now and then, there will be lots of spotless suns. At first, the blank stretches will be measured in days; later in weeks and months. When the sunspot cycle reaches its nadir, a whole year could go by without sunspots.
However, don't expect space weather to go away. Solar Minimum brings many interesting changes. For instance, as the extreme ultraviolet output of the sun decreases, the upper atmosphere of Earth cools and collapses. This allows space junk to accumulate around our planet. Also, the heliosphere shrinks, bringing interstellar space closer to Earth. Galactic cosmic rays penetrate the inner solar system--and Earth--with relative ease.
Indeed, a cosmic ray surge is already underway . 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. This exposure will increase as Solar Minimum deepens.
Realtime Space Weather Photo Gallery
NOCTILUCENT CLOUDS CONTINUE TO BRIGHTEN: Monitoring the Arctic from Earth orbit, NASA's AIM spacecraft shows a brightening ring of noctilucent clouds around the north pole--a ring whose ragged edge is spreading south. Last night, around midnight in Europe, the electric-blue ripples appeared over Plavinas, Latvia:
"It was a beautiful midsummer display," says photographer Guntis Grandans.
When will these clouds appear over the United States? The latitude of Plavina is +56.6 degrees. For comparison, the latitude of, say, Seattle is +47.6 degrees. That means the clouds will have to spread south at least another 10 degrees before they attract widespread attention in the continental USA. Our guess would be the first weeks of July, although earlier surprises are possible.
Observing tips: Look west 30 to 60 minutes after sunset when the sun has dipped 6o to 16o below the horizon. If you see luminous blue-white tendrils spreading across the sky, you may have spotted a noctilucent cloud.
Realtime Noctilucent Cloud Photo Gallery
MIDNIGHT SUN AND MOON: Imagine seeing the sun and the full Moon ... simultaneously ... at the stroke of midnight ... on the summer solstice. It happened last night inside the Arctic Circle. Göran Strand photographed them both on June 21st from Gällivare, Sweden:
"Seeing the Midnight Sun is really special," says Strand. "After I photographed the sun, I turned around and there was the Moon, too! It was quite awesome to be able to see both the sun and the full Moon during the night."
This is a coincidence that doesn't happen often. It's been decades since the full Moon fell on the night of the solstice, joining the sun as a midnight herald of summer. Strand was in the right place at the right time for a truly unique moonshot. Browse the gallery for more.
Realtime Sprite Photo Gallery
Realtime Aurora Photo Gallery
Realtime Comet Photo Gallery
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 Jun. 24, 2016, the network reported 15 fireballs.
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]
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 June 24, 2016 there were 1707 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. MAG is the visual magnitude of the asteroid on the date of closest approach.
| ||Cosmic Rays in the Atmosphere |
These measurements are based on regular space weather balloon flights: learn more.
|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) |
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. For example, here is the data from a flight on Oct. 22, 2015:
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.
| ||The official U.S. government space weather bureau |
| ||The first place to look for information about sundogs, pillars, rainbows and related phenomena. |
| ||Researchers call it a "Hubble for the sun." SDO is the most advanced solar observatory ever. |
| ||3D views of the sun from NASA's Solar and Terrestrial Relations Observatory |
| ||Realtime and archival images of the Sun from SOHO. |
| ||from the NOAA Space Environment Center |
| ||the underlying science of space weather |
| ||Tobi -- Proud Supporter of Space Education! |
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