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QUADRANTID METEOR SHOWER: Today, Earth is passing through a stream of debris from shattered comet 2003 EH1, source of the annual Quadrantid meteor shower. This is normally a strong shower. In 2018, however, meteor counts will be sharply depressed by glare from the waning supermoon. Northern sky watchers may see little more than a handful of Quadrantids per hour after nightfall on Wednesday. The shower's forecasted peak around 22:00 UT on Jan. 3rd favors Europe and east Asia. Free: Meteor alerts.
ELECTRIC-BLUE CLOUDS CIRCLING ANTARCTICA: NASA's AIM spacecraft is monitoring a vast ring of electric-blue clouds circling high above Antarctica. These are noctilucent clouds (NLCs), made of ice crystals frosting specks of "meteor smoke" in the mesosphere 83 km above the frozen continent. Here is an animation from the past week:
This is the season for southern noctilucent clouds. Every year around this time, summertime water vapor billows up into the high atmosphere over Antarctica, providing moisture needed to form icy clouds at the edge of space. Sunlight shining through the high clouds produces an electric-blue glow, which AIM can observe from Earth orbit.
"The current season began on Nov. 19th," says Cora Randall, a member of the AIM science team at the University of Colorado's Laboratory for Atmospheric and Space Physics. "Compared to previous years of AIM data, this season seems to be fairly average, but of course one never knows what surprises lie ahead, particularly since the southern hemisphere seasons are so variable."
The formation of strange clouds in the high atmosphere over remote Antarctica may seem to be of little practical interest--but that would be incorrect. Researchers studying NLCs have discovered unexpected teleconnections between these clouds and weather patterns thousands of miles away. Two years ago, for instance, Randall and colleagues found that the winter air temperature in many northern US cities was well correlated with the frequency of noctilucent clouds over Antarctica. Understanding how these long-distance connections work could improve climate models and weather forecasting--all the more reason to study eerily beautiful NLCs.
Realtime Space Weather Photo Gallery
VALENTINE'S DAY IS ONLY 6 WEEKS AWAY: Christmas is over. Next up: Valentine's Day. If you are looking for a far-out Valentine's gift, consider this:
On Dec. 29, 2017, the students of Earth to Sky Calculus flew a payload-full of these 18k rose gold plated Valentine's pendants to the stratosphere onboard a high-altitude helium balloon. The necklaces traveled alongside an array of cosmic ray sensors, which the students use to monitor deep-space radiation penetrating Earth's atmosphere.
You can have one for $119.95. Each glittering pendant comes with a greeting card showing the jewelry in flight and telling the story of its journey 36 km (118,110 feet) above the Sierra Nevada mountains of central California. Sales support the Earth to Sky Calculus cosmic ray ballooning program and hands-on STEM research.
Far Out Gifts: Earth to Sky Store
All proceeds support hands-on STEM education
SUPERMOON OVER ANTARCTICA: Around the world this week, sky watchers enjoyed the luminous glow of a perigee supermoon--as much as 8% wider and 16% brighter than average full Moons. It was even seen in Antarctica. B. Sudarsan Patro sends this picture from the Bharati Indian Research Base Station on the coast of the frozen continent:
"[We had an] amazing view of the supermoon rising over frozen sea ice, hills, and icebergs from our research station in the Larsemann Hills of East Antarctica," says Patro.
From their latitude of 69o S, the Moon barely cleared the horizon, rising less than a degree above the frigid sea surface. A fraction of a degree was more than enough, however, for a marvelous moonrise at the south end of the world.
"On behalf of our research staff," says Patro, "we wish you all a very happy, joyful, peaceful and Healthy New Year in 2018!"
Realtime Space Weather Photo Gallery
Realtime Aurora 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 Jan. 3, 2018, the network reported 51 fireballs.
(44 sporadics, 4 December Leonis Minorids, 3 Quadrantids)
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 January 3, 2018 there were 1872 potentially hazardous asteroids.
|
Recent & Upcoming Earth-asteroid encounters: Asteroid | Date(UT) | Miss Distance | Velocity (km/s) | Diameter (m) |
2017 YZ4 | 2017-Dec-28 | 0.6 LD | 9.6 | 8 |
2017 YB6 | 2017-Dec-29 | 6.1 LD | 12.3 | 11 |
2017 YP6 | 2017-Dec-29 | 14.2 LD | 16 | 34 |
2017 XG1 | 2017-Dec-29 | 16.3 LD | 9.9 | 38 |
2017 QL33 | 2017-Dec-30 | 13.3 LD | 8.2 | 196 |
2017 YU1 | 2017-Dec-30 | 7.8 LD | 7.6 | 21 |
2017 YE7 | 2017-Dec-30 | 0.8 LD | 20.2 | 7 |
2017 YL5 | 2017-Dec-31 | 16.4 LD | 19.6 | 61 |
2017 YD | 2018-Jan-01 | 19.1 LD | 4.1 | 30 |
2015 RT1 | 2018-Jan-02 | 20 LD | 9 | 30 |
2017 YD7 | 2018-Jan-03 | 4.7 LD | 10.5 | 12 |
2017 YJ7 | 2018-Jan-07 | 11.9 LD | 5.7 | 20 |
2017 YK7 | 2018-Jan-07 | 10.6 LD | 10.7 | 43 |
2017 YX4 | 2018-Jan-08 | 14.9 LD | 7.3 | 63 |
2017 XT61 | 2018-Jan-08 | 11.3 LD | 10.8 | 84 |
2004 FH | 2018-Jan-10 | 20 LD | 8.5 | 26 |
2017 YU3 | 2018-Jan-14 | 18.2 LD | 13.1 | 59 |
306383 | 2018-Jan-22 | 14.4 LD | 17.4 | 178 |
2002 CB19 | 2018-Feb-02 | 10.5 LD | 15.6 | 36 |
276033 | 2018-Feb-04 | 11 LD | 34 | 646 |
2015 BN509 | 2018-Feb-09 | 12.9 LD | 17.7 | 257 |
1991 VG | 2018-Feb-11 | 18.4 LD | 2.1 | 7 |
2014 WQ202 | 2018-Feb-11 | 15.1 LD | 19.8 | 62 |
2016 CO246 | 2018-Feb-22 | 15.3 LD | 5.4 | 21 |
2017 DR109 | 2018-Feb-24 | 3.7 LD | 7.4 | 11 |
2016 FU12 | 2018-Feb-26 | 13.2 LD | 4.5 | 15 |
2014 EY24 | 2018-Feb-27 | 14.8 LD | 8 | 54 |
2015 BF511 | 2018-Feb-28 | 11.7 LD | 5.7 | 39 |
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.
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