Learn to photograph Northern Lights like a pro. Sign up for Peter Rosen's Aurora Photo Courses in Abisko National Park.
WEEKEND OUTLOOK: A solar wind stream is expected to hit Earth's magnetic field on March 8-9, possibly sparking geomagnetic storms around the Arctic Circle. High-latitude sky watchers should be alert for Northern Lights later this weekend. Aurora alerts: text, voice
WHAT'S AROUND THE BEND? A sunspot hidden just behind the sun's southeastern limb is crackling with solar flares. The strongest so far, an M3-class eruption on March 6th at 04:57 UT, is circled in this extreme UV image from NASA's Solar Dynamics Observatory:
A pulse of extreme UV radiation from the flare ionized the upper layers of Earth's atmosphere, causing a short-lived blackout of radio communications over Indonesia and surrounding waters: blackout map. Mariners and ham radio operators in the area would have noticed weak signals at frequencies below 10 MHz.
The source of the flare will be revealed in the days ahead as the sun's rotation turns the underlying sunspot toward Earth. Stay tuned. Solar flare alerts: text, voice
Space Weather Photo Gallery
MINI FULL MOON: You've heard of the supermoon. Get ready for the opposite--a mini Moon. Tonight's full Moon will be as much as 50,000 km farther away than other full Moons of the year, making it smaller and dimmer than usual. This image created by Alan Dyer of Silver City, New Mexico, illustrates the difference:
The apparent size of the Full Moon changes throughout the year because the Moon's orbit is not a circle, it is an ellipse, with one side (apogee) 50,000 km farther from Earth than the other side (perigee): diagram. When the Moon is on the apogee side, it looks smaller and dimmer in proportion to its increased distance.
Can you tell the difference? Some people say "yes," others "no." There are no rulers floating in the sky to measure lunar diameters. Without a reference, it can be challenging to distinguish an apogee Moon from a perigee Moon. Decide for yourself. Go outside after sunset, look east, and enjoy the mini-moonlight.
Space Weather Photo Gallery
SPACE SEEDS: In late February, the students of Earth to Sky Calculus conducted an experiment in "space agriculture." Using a sub-orbital helium balloon, they flew a dozen varieties of garden vegatables and flowers to the edge of space. Here are three of the seed packets photographed at an altitude of 112,030 feet:
During their ascent to the stratosphere, these seeds (and 80 other packets not shown) experienced temperatures as low as -63 C, air pressures akin to those on the planet Mars, and cosmic ray dose rates 40x Earth-normal. While these "space seeds" were flying to the edge of space, identical control samples remained behind on Earth.
Students intend to plant the flown seeds side-by-side with control samples to investigate whether near-space travel affects the viability, color, size, taste or other characteristics of the plants.
Readers, would you like to grow your own space garden? For a small donation of $49.95 to Earth to Sky Calculus, you can have some of these space seeds for yourself. They make a great science fair project and, possibly, a unique meal! You may chose any two seed types from the following list: turnips, cherry tomatoes, beefsteak tomatoes, sweet corn, green beans, bell peppers, helichrysum flowers, jalapeno peppers, petunias, radishes, sunflowers, cosmos flowers, pumpkins, broccoli and carrots. We will send you flown+control packets for both of your selections. Contact Dr. Tony Phillips to place your order. All proceeds support student research.
Comet Photo Gallery
Aurora Photo Gallery
Every night, a network
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 Mar. 5, 2015, the network reported 18 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
all the time.
March 6, 2015 there were 1556
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.
official U.S. government space weather bureau
first place to look for information about sundogs,
pillars, rainbows and related phenomena.
call it a "Hubble for the sun." SDO
is the most advanced solar observatory ever.
views of the sun from NASA's Solar and Terrestrial
and archival images of the Sun from SOHO.
the NOAA Space Environment Center
underlying science of space weather