Space Weather Update: 03/02/2017
By Spaceweather.com, 03/02/2017
NORTHERN AND SOUTHERN LIGHTS: Today, G1-class geomagnetic storms are in progress as Earth moves through a stream of fast-moving solar wind. With wind speeds topping 700 km/s, bright auroras are circling both of Earth’s poles. Taichi Nakamura photographed the Southern Lights from Crystals beach, Otago, New Zealand:
“I enjoyed this joyful view while sitting with one of my favorite Cabbage trees at the beach,” says Nakamura.
Meanwhile, on the other end of the Earth, Northern Lights exploded over the frosty terrain of Tromsø, Norway:
“Great impact tonight,” says photographer Bernt Olsen. “We saw coronas overhead and lots of fast moving auroras.”
The solar wind is flowing from a large canyon-shaped hole in the sun’s atmosphere and is expected to influence Earth for the next two days. Polar sky watchers should remain alert for auroras on Mar. 2nd as NOAA forecasters estimate a 60% chance of continued geomagnetic storms. Free: Aurora alerts.
A NEW KIND OF SPACE WEATHER BALLOON: The students of Earth to Sky Maritime (a franchise of Earth to Sky Calculus) have built a space weather balloon payload that does something new: it floats. On Feb. 14th, they launched an experimental pipe-shaped payload from Calistoga, California. After a 2.5 hour trip to the stratosphere, the floating cylinder parachuted back to Earth and splashed down in the San Pablo Bay northeast of San Francisco.
Guided by radar and GPS trackers, student mariners recovered the payload from the deck of the Cub, a tug boat operated by Cal Maritime. Not everything went perfectly. The payload’s camera popped off at the moment of landing and sank to the bottom of the Bay–so no images from the stratosphere. Otherwise, the launch, tracking and recovery were a big success.
This development will allow us to start launching space weather balloons from places on Earth where the possibility of a water landing previously forbid such missions. The students of Earth to Sky Maritime already have one such place in mind: South Carolina during the August 21, 2017, total solar eclipse. They plan to photograph the eclipse from the stratosphere over Charleston and recover the payload later from the Atlantic after the Moon’s shadow passes by.
All Sky Fireball Network
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 Mar. 2, 2017, the network reported 20 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]
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 March 2, 2017 there were 1776 potentially hazardous asteroids.
Recent & Upcoming Earth-asteroid encounters:
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 12% 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.
Daily Sun: 02 Mar 17
Not one of these sunspots poses a threat for strong solar flares. Credit: SDO/HMI
Sunspot number: 55
What is the sunspot number?
Updated 02 Mar 2017
Current Stretch: 0 days
2017 total: 11 days (19%)
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%)
Updated 02 Mar 2017
Current Auroral Oval:
Coronal Holes: 02 Mar 17
Earth is inside a stream of solar wind flowing from the indicated coronal hole. Credit: NASA/SDO.
Noctilucent Clouds The southern season for noctilucent clouds began on Nov. 17, 2016. Come back to this spot every day to see the “daily daisy” from NASA’s AIM spacecraft, which is monitoring the dance of electric-blue around the Antarctic Circle.
Updated at: 02-24-2017 17:55:02
Updated at: 2017 Mar 01 2200 UTC
Updated at: 2017 Mar 01 2200 UTC