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AMAZING NEWS--COMET LANDER PHONES HOME: Seven months after the European Space Agency lost contact with its comet lander, Philae, the probe has unexpectedly radioed Earth. "Philae is doing very well: It has an operating temperature of -35ºC and has 24 Watts available," says DLR Philae Project Manager Dr. Stephan Ulamec. "The lander is ready for operations." Last November, Philae bounced into shadows on the surface of comet 67P. Starved of solar power, it fell asleep. Now, with the comet approaching the sun, Philae has been able to wake up again. Congratulations to the ESA for a very pleasant surprise.
ELECTRIC-BLUE MEETS AURORA-GREEN: As predicted, a solar wind stream hit Earth's magnetic field on Sunday, June 14th, sparking a minor geomagnetic storm. People in Canada were already outdoors watching noctilucent clouds (NLCs) when the sky filled with a diffuse green glow. Mike Isaak sends this picture from Edmonton, Alberta:
"Green auroras are very pretty alongside electric-blue noctilucent clouds," says Isaak. "What a night!"
High-latitude sky watchers should remain alert for both colors tonight. Seeded by meteoroids and (some say) boosted by climate change, noctilucent clouds have been growing in brightness in recent weeks. Meanwhile, NOAA forecasters estimate a 45% chance of geomagnetic storms on June 15th as the solar wind continues to blow. Photographers, submit your images here.
Realtime NLC Photo Gallery | Realtime Aurora Photo Gallery
AN INCREASE IN COSMIC RAYS: For the past month, solar activity has been low. The last big burst of solar activity happened on May 5th when an X2-class solar flare erupted from the sun's eastern limb. Since then ... quiet. To investigate the effect of low solar activity on the atmosphere, Spaceweather.com and the students of Earth to Sky Calculus have been launching helium balloons at approximately weekly intervals. Equipped with X-ray and gamma-ray sensors, the balloons measure ionizing radiation all the way from ground level to the stratosphere. Here are the results:
During the past month of low solar activity, ionizing radiation in the stratosphere has increased by 10%. This may seem counterintuitive, but there is a simple explanation: The radiation we measure is dominated by cosmic rays--a mix of subatomic particles, X-rays and gamma-rays that come from outside the solar system. Explosions on the sun (especially CMEs) tend to push these cosmic rays away from Earth. During the past month, however, there have been relatively few CMEs. Fewer CMEs means more cosmic rays. Yin-yang.
Cosmic rays are an important form of space weather. They matter to anyone who steps foot on an airplane. According to NASA, a 100,000 mile frequent flier will absorb a dose of radiation equivalent to 10 chest X-rays--all from cosmic rays. Cosmic rays have also been linked to cloud cover, lightning, and they may play some role in climate change.
If the sun remains quiet, cosmic rays could increase even more. Stay tuned for updates from the stratosphere.
Realtime Space Weather Photo Gallery
SUNSET PLANETS: If you love stargazing, there's a date you should mark on your calendar: June. That's right, the whole month. Throughout the month of June 2015, the two brightest planets, Venus and Jupiter, will be converging in the sunset sky. Last night in Vulcan, Alberta, photographer Alan Dyer caught them lining up with 1st-magnitude star Regulus:
"Venus and Jupiter were visible even through light clouds," says Dyer. "It was a beautiful sight."
The convergence will continue for the rest of the month. Every night you can see the two planets drawing closer together. By the end of June, Venus and Jupiter will be a jaw-dropping 1/3rd of a degree apart. That's less than the width of a full Moon. You'll be able to hide the pair behind the tip of your pinky finger held at arm's length.
Observing tips: When the sun goes down, step outside and look west. You don't have to wait until the sky fades to black. Venus and Jupiter are so bright, you can see then shining through the twilight. In fact, some people say the planets are especially beautiful when they are surrounded by the cobalt hue of the early evening sky. Browse the realtime photo gallery for daily sightings.
Realtime Space Weather Photo Gallery
Realtime NLC Photo Gallery
Realtime Aurora Photo Gallery
Realtime Sprite 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. 15, 2015, the network reported 16 fireballs.
(15 sporadics, 1 June mu Cassiopeiid)
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 15, 2015 there were 1590 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.
| ||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 |
| ||Web-based high school science course with free enrollment |