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Observing tips: Look west 30 to 60 minutes after sunset when the Sun has dipped 6o to 16o below the horizon. If you see luminous blue-white tendrils spreading across the sky, you've probably spotted a noctilucent cloud. Although noctilucent clouds appear most often at arctic latitudes, they have been sighted in recent years as far south as Colorado, Utah and Virginia. NLCs are seasonal, appearing

Sunspot number: 185 What is the sunspot number? Updated 15 May 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 d

Solar wind speed: 458.6 km/sec density: 1.02 protons/cm3 more data: ACE, DSCOVR Updated: Today at 0335 UT X-ray Solar Flares 6-hr max: X2 1438 UT May15 24-hr: X8 1651 UT May14 explanation | more data Updated: Today at: 1540 UT Sunspot number: 185 What is the sunspot number? Updated 15 May 2024 Spotless Days Current Stretch: 0 days 2024 total: 0 days (0%) 2023 total: 0 days (0%) 2022 total: 1 day (