CME STRIKE SPARKS SEVERE GEOMAGNETIC STORM: As predicted,  a CME struck Earth on June 28th (~1000 UT). The impact sparked a severe  G4-class geomagnetic storm, surprising forecasters who expected only a minor G1-class event. Daylight over Europe and the Americas hid a potentially dynamite display of auroras. The storm is subsiding now and should soon be over. Aurora alerts: SMS Text

Solar wind speed: 469.6 km/sec density: 6.49 protons/cm3 more data: ACE, DSCOVR Updated: Today at 0856 UT X-ray Solar Flares 6-hr max: C2 1845 UT Jun28  24-hr: C6  2347 UT Jun27   explanation | more data Updated: Today at: 2100 UT Daily Sun: 28 Jun 24  Expand: labels | no labels | Carrington Decaying sunspot AR3723 has a 'beta-gamma' magnetic field which poses a threat for M-class solar flares. Credit: SDO/HMI Sunspot number: 146  What is the sunspot number? Updated 28 Jun 2024 Spotless Days Current Stretch: 0 days 2024 total: 0 days (0%) 2023 total: 0 days (0%) 2022 total: 1 day (<1%) 2021 total: 64 days (18%) 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 28 Jun 2024 Thermosphere Climate Index today: 27.37x1010 W Hot Max: 49.4x1010 W Hot (10/1957) Min: 2.05x1010 W Cold (02/2009) explanation | more data: gfx, txt Updated 27 Jun 2024 The Radio Sun  10.7 cm flux: 183 sfu explanation | more data Updated 28 Jun 2024 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. Oulu Neutron Counts Percentages of the Space Age average: today: -4.2% Low  48-hr change: -1.0% Max: +11.7% Very High (12/2009) Min: -32.1% Very Low (06/1991) explanation | more data Updated 28 Jun 2024 @ 0700 UT Current Auroral Oval:  Switch to: Europe, USA, New Zealand, Antarctica Credit: NOAA/OvationPlanetary K-index Now: Kp= 5.33  storm 24-hr max: Kp= 7.67 storm explanation | more data Interplanetary Mag. Field Btotal: 11.14 nT Bz: 7.88 nT north more data: ACE, DSCOVR Updated: Today at 0857 UT Coronal Holes: 28 Jun 24 There are no equatorial coronal holes on the Earthside of the sun.Credit: SDO/AIA Polar Stratospheric Clouds Colorful Type II polar stratospheric clouds (PSC) form when the temperature in the stratosphere drops to a staggeringly low -85C. NASA's MERRA-2 climate model predicts when the air up there is cold enough: On June 28, 2024, the Arctic stratosphere is  much too warm for Type II polar stratospheric clouds. | more data. Noctilucent Clouds  They're back! The northern season for NLCs is underway. The first clouds were detected inside the Arctic Circle on May 25, 2024, by the NOAA 21 satellite. The clouds have since spread, and now observers are seeing from the ground as well: Updated: June 26, 2024 An instrument onboard NOAA 21 (OMPS LP) is able to detect NLCs (also known as "polar mesospheric clouds" or PMCs). In the daily map, above, 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. SPACE WEATHER NOAA Forecasts Updated at: 2024 Jun 27 2200 UTC FLARE 0-24 hr 24-48 hr CLASS M 55 % 55 % CLASS X 05 % 05 % Geomagnetic Storms: Probabilities for significant disturbances in Earth's magnetic field are given for three activity levels: active, minor storm, severe stormUpdated at: 2024 Jun 27 2200 UTCMid-latitudes  0-24 hr 24-48 hr ACTIVE 35 % 45 % MINOR 20 % 20 % SEVERE 05 % 05 % High latitudes  0-24 hr 24-48 hr ACTIVE 10 % 10 % MINOR 25 % 25 % SEVERE 50 % 60 %

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