What are Space Weather Alerts?
If you're interested in seeing auroras or knowing about solar flares and radiation storms, this package is for you. Subscribers will receive the following kinds of phone calls:
 

* Aurora warnings: Sometimes we can predict geomagnetic storms two days in advance, for example when a coronal mass ejection is heading for Earth. In such cases we'll call you with a warning that auroras could appear within 48 hours.

* Geomagnetic storms: We'll also call you when a geomagnetic storm is in progress, but only if it's strong enough to produce auroras over your location. These alerts are based on measurements of the planetary K index or "Kp" -- a number that tells us how much Earth's magnetic field is shaking. Kp ranges from 0 (no storm) to 9 (severe storming). When you sign up for Spaceweather PHONE, we'll chose the value of Kp that's right for your location--or you can set it yourself by logging into your account and modifying your preferences. You're in control.

* X-class solar flares: X-class solar flares can cause radio blackouts, cell phone static, and they are often the first sign of a impending solar radiation storm. We'll phone you just minutes after Earth-orbiting satellites detect one of these powerful explosions on the Sun. You can enable or disable these alerts, according to your interest in them, by logging into your Spaceweather Phone account and adjusting your preferences.

* CMEs and solar wind gusts: When a coronal mass ejection sweeps by Earth, raising the solar wind velocity by more than 150 km/s, we'll call you. Solar wind gusts will also trigger this alert. You can enable or disable this alert by logging into your SpaceWeather Phone account and adjusting your preferences.

* The Interplanetary Magnetic Field: The interplanetary magnetic field (IMF) near Earth strongly influences the likelihood of auroras. When the IMF tilts south, which can happen at unexpected times for no apparent reason, intense auroras often appear. We'll phone you when the IMF tilts south (-10 nT) for three hours or more and let you know that you should step out side and look for Northern (or Southern) Lights. You can enable or disable these alerts, according to your interest in them, by logging into your Spaceweather Phone account and adjusting your preferences.

* Solar radiation storms: Explosions on the Sun, like solar flares and coronal mass ejections, sometimes hurl highly energetic particles toward Earth. When swarms of such particles surround our planet, we call it a "radiation storm." Solar radiation storms are divided into five categories: S1 is the weakest and poses no danger to people on Earth. S5 is the strongest. An S5 storm can knock out satellites and expose air travellers to harmful doses of radiation. We'll phone you the instant Earth-orbiting satellites detect an ongoing radiation of category S4 or above. You can enable or disable these alerts, according to your interest in them, by logging into your Spaceweather Phone account and adjusting your preferences.