Aurora webcams
Real-time space weather data
BzBz is the north-south direction of the magnetic field carried by the solar wind. When it points south (negative), energy from the solar wind can enter Earth's magnetic field and drive the aurora. When it points north, much less gets in.
—nT
BtBt is the total strength of the solar wind's magnetic field. A stronger field can drive brighter aurora when Bz points south. Typical values are around 5 nT; the solar plasma from a CME can bring 20 nT or more.
—nT
SpeedHow fast the solar wind is moving. Under 300 km/s is slow and 300 to 400 is average. Faster wind carries more energy, and above about 500 km/s aurora tends to be brighter, especially when Bz is south.The wind is measured about 1.5 million km toward the Sun, so changes reach Earth 30 to 60 minutes later.
—km/s
DensityHow much material the solar wind carries, in protons per cubic centimeter. Denser wind pushes harder on Earth's magnetic field, and it helps most when Bz is already south. A typical value is about 5.
—p/cm³
Source: NOAA SWPC
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All-sky cameras, aurora at 110 kmWhite circle: a camera with no picture right nowTREx RGB and SMILE ASI, University of Calgary
Light pollution (Bortle class)123456789Estimated from the Falchi et al. 2016 atlas
BzBz is the north-south direction of the magnetic field carried by the solar wind. When it points south (negative), energy from the solar wind can enter Earth's magnetic field and drive the aurora. When it points north, much less gets in.
—nT
BtBt is the total strength of the solar wind's magnetic field. A stronger field can drive brighter aurora when Bz points south. Typical values are around 5 nT; the solar plasma from a CME can bring 20 nT or more.
—nT
SpeedHow fast the solar wind is moving. Under 300 km/s is slow and 300 to 400 is average. Faster wind carries more energy, and above about 500 km/s aurora tends to be brighter, especially when Bz is south.The wind is measured about 1.5 million km toward the Sun, so changes reach Earth 30 to 60 minutes later.
—km/s
DensityHow much material the solar wind carries, in protons per cubic centimeter. Denser wind pushes harder on Earth's magnetic field, and it helps most when Bz is already south. A typical value is about 5.
—p/cm³
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