Revontulet - Aurora Finland

Revontulet shows your chance of seeing the northern lights right now where you are in Finland, and how the next two nights look. THE CHANCE TO SEE, NOW The app calculates the same activity value (R) that the Finnish Meteorological Institute (FMI) uses, from magnetometer measurements at the station nearest you. It combines it with darkness, the moon and cloud cover, and gives one clear answer: None, Low, Moderate or High, with a short reason such as "Overcast" or "Bright moon". AURORA MAP Swipe left to see every FMI magnetometer station on a map of Finland. The map shows where auroras are probable, possible or unlikely right now, against each station's own thresholds. Tap a station to see its activity value. EARLY WARNING Solar wind measured between the Sun and Earth shows about 30–60 minutes in advance whether aurora activity is about to rise. FORECAST FOR TONIGHT AND TOMORROW NIGHT A two-night forecast from NOAA's Kp forecast and geomagnetic storm watches, combined with darkness, the moon and FMI's cloud forecast. Tap it to see what helps and what limits each night. AURORA ALERTS Turn on alerts to get a notification when the chance in your area reaches Moderate or High, even when the app is closed. At most three alerts a night. DETAILS WHEN YOU WANT THEM Open Details to see the activity at the nearest station, darkness, the moon's phase, cloud cover and the latest solar wind. PRIVATE BY DESIGN • Your location stays on your iPhone. Requests for measurement data cover all of Finland and contain nothing about you. • No accounts, no ads, no analytics, no tracking. • Alerts are optional and use only a coarse area of Finland, never your position. • Don't want to share your location? Choose your municipality by hand. OPEN DATA Measurements and cloud data: Finnish Meteorological Institute (FMI), CC BY 4.0 Space weather: NOAA Space Weather Prediction Center Municipality boundaries: Statistics Finland, CC BY 4.0 Revontulet covers Finland and is available in Finnish, Swedish and English.