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Solar Wind Bz
Very important for brightness. -25 to 25, lower numbers are better.
Predicted to be
after 30 min and within 3 hours.
Chance of Aurora
Taken from data provided by NOAA's Space Weather Prediction Center, this value
is an indication of how good the space weather conditions are to produce
aurora over a give location. The forecast model looks 30 minutes ahead, giving
a value between 0-100%. Note that even at low values aurorae can be
produced, and this forecast should be taken as an estimated probablility.
This index is a good indicator for how strong the Aurora will be. Typically a
higher number means the Aurora will be seen brighter and furter south. For
reference, an index of 5 or more means the Aurora is likely to be seen over
Scotland, 6 or more can be visible over most of nothern England, and 7 or more
would indicate that the whole UK has a good possibility to see the Aurora
Bz reffers to the strength of the earths magnetic field in relation to it's
north south axis, and is one the most important values in the creation of
strong and bright aurorae. A negative value is what we are looking for, this
tells us that the strength is southwards, as opposed to a positive value,
northwards. The further southwards, the stronger the aurorae can be. We are
looking for values of -2 to -25, indicating good southwards Bz for aurorae