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![]() speed: 363.3 km/sec density: 0.16 protons/cm3 more data: ACE, DSCOVR Updated: Today at 0941 UT 6-hr max: M1 0826 UT Jul16 24-hr: M2 1010 UT Jul15 explanation | more data Updated: Today at: 0945 UT ![]() Expand: labels | no labels | Carrington Sunspot number: 96 The Radio Sun Cosmic Rays Solar Cycle 25 is intensifying, and this is reflected in the number of cosmic rays entering Earth's atmosphere. Neutron counts from the University of Oulu's Sodankyla Geophysical Observatory show that cosmic rays reaching Earth are slowly declining--a result of the yin-yang relationship between the solar cycle and cosmic rays.
Credit: NOAA/Ovation Now: Kp= 1.00 quiet 24-hr max: Kp= 2.33 quiet explanation | more data Btotal: 7.09 nT Bz: -1.96 nT south more data: ACE, DSCOVR Updated: Today at 0941 UT ![]() There are no significant equatorial coronal holes on the Earthside of the sun. Credit: SDO/AIA The northern season for NLCs began on May 26th. The first clouds were detected inside the Arctic Circle by the NOAA 21 satellite. An instrument onboard NOAA 21 (OMPS LP) is able to detect NLCs (also known as "polar mesospheric clouds" or PMCs). For the rest of the season, daily maps from NOAA 21 will be presented here: ![]() Updated: Jul 15, 2023 Each dot is a detected cloud. As the season progresses, these dots will multiply in number and shift in hue from blue to red as the brightness of the clouds intensifies. What happened to NASA's AIM spacecraft, which has been monitoring NLCs since 2007? Earlier this year, the spacecraft's battery failed. As a result AIM is offline, perhaps permanently. There may be some hope of a recovery as AIM's orbit precesses into full sunlight in 2024. Until then, we will maintain AIM's iconic "daily daisy," frozen at Feb. 28, 2023, as a show of thanks for years of service and hope for future daisies:
Probabilities for significant disturbances in Earth's magnetic field are given for three activity levels: active, minor storm, severe storm
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