Arwix/Sun Explorer

[Is quiet, Minor storm, Moderate storm, Strong storm, Severe storm, Extreme storm]

[None, Passengers and crew in high-flying aircraft at high latitudes may be exposed to elevated radiation risk, Radiation hazard avoidance recommended for astronauts on EVA; passengers and crew in high-flying aircraft at high latitudes may be exposed to radiation risk, Unavoidable radiation hazard to astronauts on EVA; passengers and crew in high-flying aircraft at high latitudes may be exposed to radiation risk, Unavoidable high radiation hazard to astronauts on EVA (extra-vehicular activity); passengers and crew in high-flying aircraft at high latitudes may be exposed to radiation risk]

["None", "Infrequent single-event upsets possible", "Single-event upsets, noise in imaging systems, and slight reduction of efficiency in solar panel are likely", "May experience memory device problems and noise on imaging systems; star-tracker problems may cause orientation problems, and solar panel efficiency can be degraded", "Satellites may be rendered useless, memory impacts can cause loss of control, may cause serious noise in image data, star-trackers may be unable to locate sources; permanent damage to solar panels possible"]

["Minor impacts on HF radio in the polar regions", "Small effects on HF propagation through the polar regions and navigation at polar cap locations possibly affected", "Degraded HF radio propagation through the polar regions and navigation position errors likely", "Blackout of HF radio communications through the polar regions and increased navigation errors over several days are likely", "Complete blackout of HF (high frequency) communications possible through the polar regions, and position errors make navigation operations extremely difficult"]

[Minor, Moderate, Strong, Severe, Extreme]

[Is quiet, Minor radio blackout, Moderate radio blackout, Strong radio blackout, Severe radio blackout, Extreme radio blackout]

["Low-frequency navigation signals degraded for brief intervals", "Degradation of low-frequency navigation signals for tens of minutes", "Low-frequency navigation signals degraded for about an hour", "Outages of low-frequency navigation signals cause increased error in positioning for one to two hours. Minor disruptions of satellite navigation possible on the sunlit side of Earth", "Low-frequency navigation signals used by maritime and general aviation systems experience outages on the sunlit side of the Earth for many hours, causing loss in positioning. Increased satellite navigation errors in positioning for several hours on the sunlit side of Earth, which may spread into the night side"]

["Weak or minor degradation of HF radio communication on sunlit side, occasional loss of radio contact", "Limited blackout of HF radio communication on sunlit side, loss of radio contact for tens of minutes", "Wide area blackout of HF radio communication, loss of radio contact for about an hour on sunlit side of Earth", "HF radio communication blackout on most of the sunlit side of Earth for one to two hours. HF radio contact lost during this time", "Complete HF (high frequency) radio blackout on the entire sunlit side of the Earth lasting for a number of hours. This results in no HF radio contact with mariners and en route aviators in this sector"]

View sunrise, sunset, geomagnetic storms and golden hour times for any date

This app will help you determine the exact time of sunrise and sunset, day length, beginning and end of twilight time, geomagnetic conditions, choose the best time for photography, get notification about the beginning of magnetic storm, see image of the Sun in different spectra. 
 
Use this app for: 
- Matching your natural rhythm of life with the time of day 
- Finding a suitable date for landscape photography at sunrise and sunset, planning a photo shooting session with regard to the golden hour, critical hours, height of the Sun above the horizon 
- Purchases of real estate and location of various objects taking into account solar insolation 
- Forecast observations of the arctic lights 
- Minimize damage from magnetic storms 
 
App features: 
 
- Calculation of sunrise and sunset time, astronomical noon, day length,  beginning and end of the civil, nautical, and astronomical twilight, the onset of equinoxes and solstices. Customizable widget for sunrise and sunset time. 
 
- In the map mode position of the Sun is imposed onto terrain, anywhere in the world, on any date, using the local time. Optional recording of location and object of photography. Calculation of azimuth and height of the Sun above the horizon, a visual display of the golden hour and critical hours.  
 
- Displays the current geomagnetic solar activity, forecast of magnetic storms probability in the coming three days, notification about the beginning of a storm, display of density, temperature and speed of solar wind updated once in a minute.  
 
- Images of the Sun, active regions on the Sun surface at the current time, as well as of any date over the past 5 years.  
 
Some features are only available in the premium version. 
 
If you have any questions, problems with the app or suggestions for improvement, please send your feedback via email.