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A CME IS COMING: Earlier today (~0700 UT), a magnetic filament connecting sunspots AR3423 and AR3425 erupted. The blast hurled a CME (movie) into space near the edge of the Earth-strike zone. A glancing blow on Sept. 17th could cause G1 to G2-class geomagnetic storms with auroras in northern-tier US states. Stay tuned for updates. Aurora alerts: SMS Text
JUST ONE MONTH UNTIL THE ECLIPSE: Mark your calendar. On Oct. 14th--one month from today--the Moon will pass in front of the sun, producing an annular solar eclipse visible from North and South America. In this map, the yellow band shows where the eclipse will be best:
Detailed regional maps and timetables are available from GreatAmericanEclipse.com
This should not be confused with a total eclipse, where the Moon completely covers the sun. During an annular eclipse, the Moon is a little too small for complete coverage--a result of the Moon's elliptical orbit. When the Moon passes in front of the sun, an annulus remains visible, creating a "ring of fire" in the sky. It is still very cool. Indeed, you will literally feel cool as the diffuse shadow of the Moon passes overhead, dimming the landscape and lowering the air temperature by a few degrees.
The "path of annularity" is about 100 miles wide. Along its centerline, the sun will be ring-shaped for more than 4 minutes, with as much as 95% coverage of the solar disk. Be careful! Even a 5% sliver of the sun can be blindingly bright. Watch the event using ISO-approved eclipse glasses.
Outside the path, observers will see the sun turn into a crescent, fat or thin depending on how far they are from the centerline. This is called a "partial eclipse," also best seen using eclipse glasses. Almost all of North and South America is in the partial eclipse zone.
An annular eclipse over Southern California in Jan. 1992. Photo credit: Dennis L. Mammana
There's a lot to experience during an eclipse. Listen for changes to birdsong and insect sounds. Wildlife is known to respond to the arrival of the Moon's shadow. Also, look under leafy trees. Crescent-shaped sunbeams lancing through the foliage can dapple the ground with tiny images of the eclipsed sun. Amateur astronomers with solar-filtered binoculars can watch brilliant beads of sunlight glittering through through lunar mountains especially around the Moon's north and south poles.
To learn more about the eclipse, we recommend GreatAmericanEclipse.com. Their Field Guide to the 2023 and 2024 Solar Eclipses is a must-have for anyone planning an eclipse adventure, and they also sell safe eclipse glasses and solar binoculars.
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SOLAR ECLIPSE PENDANT: The students of Earth to Sky Calculus are about to try something never done before--to photograph the shadow of an annular solar eclipse from the stratosphere. On Oct. 14th, they'll launch a cosmic ray research balloon equipped with cameras to photograph the shadow zone of an eclipse over Nevada. You can support the flight by buying a Solar Eclipse Pendant:
It's yours for $99.95. The students launched this pendant on July 17th. Floating at an altitude 105,000 feet above Earth’s surface, it made contact with space, experiencing temperatures as low as -63 C.
Buy the pendent now and for no additional charge we will fly it back to the stratosphere during the annular eclipse. Just make a note in the COMMENTS BOX of your shopping cart: "Fly my pendant again!"
Note: We have photographed the shadow of an eclipse before. Here's what the total eclipse of Aug. 21, 2017, looked like from the stratosphere over the Nebraska-Wyoming border:
Total eclipses make deep black shadows, in this case blacking out more than 70 miles of terrain. What does the shadow of an *annular* eclipse look like? We hope to find out. It should be fuzzier around the edges, and not nearly as dark in the middle. An overview from the stratosphere could provide a unique picture.
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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 Sep 13, 2023, the network reported 10 fireballs.
(10 sporadics)
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 September 14, 2023 there were 2349 potentially hazardous asteroids.
|
Recent & Upcoming Earth-asteroid encounters: Asteroid | Date(UT) | Miss Distance | Velocity (km/s) | Diameter (m) |
2023 RM | 2023-Sep-09 | 8.6 LD | 6 | 12 |
2023 RF4 | 2023-Sep-09 | 4.6 LD | 11 | 32 |
2023 RL | 2023-Sep-09 | 2 LD | 5.4 | 8 |
2023 RO6 | 2023-Sep-09 | 5.6 LD | 12.7 | 16 |
2023 RK5 | 2023-Sep-09 | 0.7 LD | 10.1 | 6 |
2023 RX | 2023-Sep-09 | 3.1 LD | 11.5 | 13 |
2023 RB1 | 2023-Sep-10 | 15.2 LD | 8.7 | 17 |
2023 RL7 | 2023-Sep-10 | 5.1 LD | 11.5 | 13 |
2023 RP2 | 2023-Sep-10 | 1.3 LD | 9.1 | 13 |
2023 RJ | 2023-Sep-10 | 14.1 LD | 20.1 | 42 |
2023 QE8 | 2023-Sep-10 | 4 LD | 14.5 | 56 |
2023 QF6 | 2023-Sep-10 | 7 LD | 10.5 | 22 |
2023 RU | 2023-Sep-11 | 10.6 LD | 20.3 | 26 |
2023 RK | 2023-Sep-11 | 16 LD | 9.4 | 24 |
2023 RC1 | 2023-Sep-12 | 3.1 LD | 5.1 | 6 |
2020 RT2 | 2023-Sep-12 | 11 LD | 10 | 8 |
2023 RO1 | 2023-Sep-12 | 6.6 LD | 12.4 | 22 |
2023 RR | 2023-Sep-13 | 17.4 LD | 21.2 | 49 |
2023 RH2 | 2023-Sep-13 | 11.3 LD | 21.5 | 58 |
2023 RR5 | 2023-Sep-13 | 0.5 LD | 13.8 | 6 |
2023 RC4 | 2023-Sep-13 | 13.1 LD | 7.6 | 17 |
2023 RZ7 | 2023-Sep-14 | 9.9 LD | 11.9 | 57 |
2023 RL6 | 2023-Sep-14 | 8.6 LD | 9.2 | 28 |
2023 RE5 | 2023-Sep-14 | 2.3 LD | 13.6 | 12 |
2023 RO2 | 2023-Sep-15 | 7 LD | 6 | 10 |
2016 LY48 | 2023-Sep-16 | 5 LD | 10.8 | 99 |
2023 RY7 | 2023-Sep-16 | 13.7 LD | 11.1 | 27 |
2023 RM5 | 2023-Sep-16 | 11.5 LD | 9.5 | 19 |
2010 TE | 2023-Sep-16 | 6.8 LD | 6 | 22 |
2023 RV7 | 2023-Sep-18 | 10.7 LD | 19.9 | 34 |
2023 RK3 | 2023-Sep-19 | 18.8 LD | 9.6 | 43 |
2023 RA8 | 2023-Sep-20 | 15.5 LD | 6.6 | 27 |
523598 | 2023-Sep-20 | 19.8 LD | 25 | 239 |
2023 RR6 | 2023-Sep-21 | 15.5 LD | 7.5 | 14 |
2023 RQ6 | 2023-Sep-22 | 15.8 LD | 9.4 | 24 |
2023 RU3 | 2023-Sep-23 | 19.7 LD | 11.6 | 32 |
2019 SF6 | 2023-Sep-26 | 16.7 LD | 8.6 | 20 |
2023 RF3 | 2023-Sep-28 | 15.5 LD | 7.7 | 40 |
2013 TG6 | 2023-Sep-28 | 3.6 LD | 4.1 | 17 |
2009 UG | 2023-Sep-30 | 6.1 LD | 9 | 78 |
349507 | 2023-Oct-03 | 16.5 LD | 21 | 696 |
2022 FX1 | 2023-Oct-04 | 20 LD | 9.9 | 25 |
2019 QO5 | 2023-Oct-05 | 19.9 LD | 9.4 | 61 |
2023 QC8 | 2023-Oct-05 | 15.8 LD | 6.3 | 42 |
2022 TD | 2023-Oct-07 | 8.9 LD | 9.4 | 10 |
2018 ER1 | 2023-Oct-08 | 12.5 LD | 5.3 | 27 |
2022 UX1 | 2023-Oct-11 | 3.1 LD | 8.6 | 9 |
2015 KW120 | 2023-Oct-12 | 18.2 LD | 13 | 22 |
2021 NT14 | 2023-Oct-13 | 18.6 LD | 8.6 | 254 |
2011 GA | 2023-Oct-15 | 6.8 LD | 16.6 | 230 |
2007 SQ6 | 2023-Oct-15 | 19.4 LD | 6.5 | 130 |
2019 UZ3 | 2023-Oct-16 | 9.6 LD | 8.3 | 14 |
1998 HH49 | 2023-Oct-17 | 3.1 LD | 14.8 | 193 |
2022 UO10 | 2023-Oct-19 | 7.8 LD | 9.8 | 16 |
2020 UR | 2023-Oct-20 | 5.8 LD | 12.9 | 9 |
2020 FM6 | 2023-Oct-23 | 15.5 LD | 15.9 | 149 |
2019 HH4 | 2023-Oct-24 | 13.3 LD | 20 | 365 |
2023 RA4 | 2023-Oct-24 | 8.4 LD | 3.9 | 49 |
2021 SZ4 | 2023-Oct-26 | 14 LD | 30 | 287 |
302169 | 2023-Oct-26 | 12.7 LD | 25.7 | 374 |
525229 | 2023-Oct-30 | 10.6 LD | 17.4 | 200 |
2013 UV3 | 2023-Nov-01 | 14.7 LD | 15.4 | 16 |
2016 WY | 2023-Nov-02 | 9.1 LD | 3.9 | 5 |
363505 | 2023-Nov-02 | 13.7 LD | 8 | 709 |
2022 JF | 2023-Nov-03 | 15.2 LD | 17.2 | 39 |
2023 QP8 | 2023-Nov-03 | 17.1 LD | 8.8 | 171 |
2016 VW2 | 2023-Nov-03 | 10.1 LD | 8.1 | 20 |
2019 UH7 | 2023-Nov-04 | 9.9 LD | 5.9 | 11 |
Notes: LD means "Lunar Distance." 1 LD = 384,401 km, the distance between Earth and the Moon. 1 LD also equals 0.00256 AU. | Cosmic Rays in the Atmosphere |
SPACE WEATHER BALLOON DATA: Almost 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 sensors that detect secondary cosmic rays, a form of radiation from space that can penetrate all the way down to Earth's surface. Our monitoring program has been underway without interruption for 7 years, resulting in a unique dataset of in situ atmospheric measurements.
Latest results (July 2022): Atmospheric radiation is decreasing in 2022. Our latest measurements in July 2022 registered a 6-year low:
What's going on? Ironically, the radiation drop is caused by increasing solar activity. Solar Cycle 25 has roared to life faster than forecasters expected. The sun's strengthening and increasingly tangled magnetic field repels cosmic rays from deep space. In addition, solar coronal mass ejections (CMEs) sweep aside cosmic rays, causing sharp reductions called "Forbush Decreases." The two effects blend together to bring daily radiation levels down.
.Who cares? Cosmic rays are a surprisingly "down to Earth" form of space weather. They can alter the chemistry of the atmosphere, trigger lightning, and penetrate commercial airplanes. According to a study from the Harvard T.H. Chan school of public health, crews of aircraft have higher rates of cancer than the general population. The researchers listed cosmic rays, irregular sleep habits, and chemical contaminants as leading risk factors. A number of controversial studies (#1, #2, #3, #4) go even further, linking cosmic rays with cardiac arrhythmias and sudden cardiac death.
Technical notes: 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.
Data points in the graph labeled "Stratospheric Radiation" correspond to the peak of the Regener-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 Regener and Georg Pfotzer discovered the maximum using balloons in the 1930s and it is what we are measuring today.
| 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. |
| information about sunspots based on the latest NOAA/USAF Active Region Summary |
| current counts of failed and deployed Starlink satellites from Jonathan's Space Page |
| Authoritative predictions of space junk and satellite re-entries |
| from the NOAA Space Environment Center |
| fun to read, but should be taken with a grain of salt! Forecasts looking ahead more than a few days are often wrong. |
| from the NOAA Space Environment Center |
| the underlying science of space weather |
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