Solar Weather
Live Kp dashboard
Current geomagnetic state, aurora chance, trend, and today's peak on one screen.
Real-time space weather
Solar Weather
Magnetic storms and moon phases in your pocket and on your wrist.
Track the Kp-index, storm forecasts, aurora chances, and lunar events on phone, Apple Watch, and Wear OS.
Built for quick decisions
The redesigned phone interface keeps the signal visible: current Kp, trends, forecasts, moon phases, and notification controls.
Storm forecasts
Hourly Kp history, 24-hour forecasts, and the 27-day solar outlook from NOAA.
Moon calendar
Monthly lunar phases with illumination, lunar day, and full or new moon timing.
Notification control
Choose exactly which solar and lunar alerts matter to you.
On your wrist too
Solar Weather also runs on Apple Watch and Wear OS, with the essentials tuned for quick checks when your phone stays in your pocket.
watchOS
Apple Watch
A compact watchOS companion keeps Kp, moon phase, and short storm forecasts one tap away.
Android watch
Wear OS
The Android watch version uses a round-first interface for glanceable space weather.
Everything important, without noise
Solar Weather focuses on the moments when space weather matters: storms, aurora visibility, lunar cycles, and timely alerts.
Real-time geomagnetic activity
Monitor the planetary Kp-index on a clear 0-9 scale with color-coded status.
Short-range storm forecast
See the last 24 hours and the next 24-hour forecast before conditions change.
Long-range solar outlook
Use NOAA 27-day data to spot periods when solar activity may rise.
Offline lunar calendar
Moon phases are calculated on-device, so the calendar keeps working without internet.
Nine notification types
Configure magnetic storm, severe storm, full moon, and new moon alerts.
Space weather library
Read concise articles about magnetosphere, K-index, health, the Sun, and aurora.
Read the Kp-index at a glance
Kp measures geomagnetic disturbance from 0 to 9. Higher values mean stronger storms and better aurora chances.
- 0-1 Quiet
- 2-3 Unsettled
- 4 Active
- 5-6 Storm
- 7-9 Severe
A highlighted peak helps you see how intense the current day has been.
Private by design
Solar Weather is free, has no ads, and does not use analytics for tracking. The app only stores what is needed to deliver the alerts you choose.
Push token only
A device push token is stored on the server so selected notifications can be delivered.
Moon data stays local
Moon phase calculations run on your device and do not require a network connection.
No tracking SDKs
Firebase is used for push delivery only. There are no ads and no behavioral analytics.
Open NOAA data
Geomagnetic forecasts come from public data provided by NOAA.
Built by Andrey Sapunov
For support, feedback, bug reports, or a thoughtful idea, reach out on LinkedIn.