SpaceWeather.com -- News and information about meteor showers, solar flares, auroras, and near-Earth

Time 2021-08-15 08:07:17

Web Name: SpaceWeather.com -- News and information about meteor showers, solar flares, auroras, and near-Earth

WebSite: http://www.spaceweather.com

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What is the sunspot number? Updated 14 Aug 2021 Spotless Days Current Stretch: 1 day 2021 total: 56 days (25%) 2020 total: 208 days (57%) 2019 total: 281 days (77%) 2018 total: 221 days (61%) 2017 total: 104 days (28%) 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%) 2008 total: 268 days (73%) 2007 total: 152 days (42%) 2006 total: 70 days (19%) Updated 14 Aug 2021 Thermosphere Climate Index today: 4.95x1010 W Cold Max: 49.4x1010 W Hot (10/1957) Min: 2.05x1010 W Cold (02/2009) explanation | more data: gfx, txt Updated 14 Aug 2021 The Radio Sun 10.7 cm flux: 73 sfu explanation | more dataUpdated 14 Aug 2021 There are no significant equatorial coronal holes on the Earthside of the sun. Credit: SDO/AIA Noctilucent Clouds Noctilucent cloud season is underway. It began on May 20th with a patch of electric-blue clouds over Ellesmere Island in northern Canada. The clouds have since intensified, with sightings as far south as +37N latitude. THE SUN IS BLANK: Today, there are no sunspots on the sun--only tiny pores and regions of magnetic froth called plage . So far, 2021 has had 56 spotless days. That might sound like a lot, but it is in fact a sharp reduction from hundreds of spotless days observed in 2019 and 2020. Despite today's blank sun, solar activity is intensifying compared to previous years. Aurora alerts: SMS Text. SPOTLESS SOLAR FLARE: Who needs sunspots? On Friday, Aug. 13th (2108 UT), a spotless region near the center of the solar disk unleashed a C1-class solar flare. NASA's Solar Dynamics Observatory recorded the extreme ultraviolet flash: The impulsive explosion created a mild wave of ionization over the Pacific Ocean (map), altering the propagation of radio transmissions below ~5 MHz. That may have been the only Earth-effect. No coronal mass ejection (CME) has emerged from the blast site, zeroing the chance of a geomagnetic storm. Solar Flare alerts: SMS Text. Realtime Space Weather Photo GalleryFree: Spaceweather.com Newsletter THIS MOONSTONE HAS TOUCHED SPACE: Are you looking for a far-out gift? Nothing says "I love you" like a moonstone from the edge of space. The students of Earth to Sky Calculus flew this one wrapped in a hand-crafted sterling silver Celtic love knot 35.1 km (115,158 feet) above Earth's surface: You can have it for $179.95. The students are selling these pendants to support their cosmic ray ballooning program. Each one comes with a greeting card showing the item in flight and telling the story of its journey to the edge of space. All sales support the Earth to Sky Calculus cosmic ray ballooning program and hands-on STEM research. Far Out Gifts: Earth to Sky Store All sales support hands-on STEM education Realtime Aurora Photo GalleryFree: Spaceweather.com Newsletter Realtime Noctilucent Cloud Photo GalleryFree: Spaceweather.com Newsletter 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 Aug 14 2021, the network reported 83 fireballs.(46 Perseids, 37 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. "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. 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 6 years, resulting in a unique dataset of in situ atmospheric measurements. Latest results: Our most recent flight on June 25, 2021, confirms a trend of decreasing cosmic radiation: Cosmic ray dose rates peaked in late 2019, and have been slowly declining ever since. This makes perfect sense. Solar Minimum was in late 2019. During Solar Minimum the sun's magnetic field weakens, allowing more cosmic rays into the solar system. We expect dose rate to be highest at that time. Now that Solar Minimum has passed, the sun is waking up again. Solar magnetic fields are strengthening, providing a stiffer barrier to cosmic rays trying to enter the solar system. The decline of cosmic radiation above California is a sign that new Solar Cycle 25 is gaining strength. .Who cares? Cosmic rays are a surprisingly "down to Earth" form of space weather. They can seed clouds, 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. Somewhat more controversial studies (#1, #2, #3, #4) llink cosmic rays with cardiac arrhythmias and sudden cardiac death. En route to the stratosphere, our sensors also pass through aviation altitudes: In this plot, 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. The higher you fly, the more radiation you will absorb. 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 first graph ( Stratospheric Radiation ) correspond to the peak of the Regener-Pfotzer maximum, which lies about 67,000 feet above central California. 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