What is Space Weather?
Space weather describes conditions in the space environment around Earth that are influenced by the Sun. It includes the solar wind, solar flares, coronal mass ejections (CMEs), and their effects on Earth's magnetosphere and ionosphere. When these interact with Earth, they can cause geomagnetic storms, aurora, and impacts on technology such as power grids, satellites, and communications.
Key Processes
- Solar wind: A continuous stream of charged particles and magnetic field from the Sun.
- Solar flares: Sudden bursts of radiation (X-rays, UV) from the Sun's atmosphere; they reach Earth in about 8 minutes.
- CMEs: Large eruptions of plasma and magnetic field; they can take 1–3 days to reach Earth and trigger geomagnetic storms.
- Geomagnetic storms: Disturbances of Earth's magnetic field, measured by the Kp index (0–9).
Why It Matters
Space weather affects satellites, power grids, radio, GPS, and aviation. It also produces aurora when activity is high. Agencies like NOAA SWPC, NASA, and ESA monitor and forecast space weather. Cosmic Radar shows the daily Kp index, reported flares and CMEs, and an aurora outlook so you can follow activity in one place.
Sources and further reading
- NOAA Space Weather Prediction Center – Official US forecasts and alerts
- ESA Space Weather – European monitoring
- NASA DONKI – Space weather events database