What are the conditions required for aurora Australis phenomenon formation
Answers
Answer:
Explanation:
The aurora australis is more commonly seen in Australia around the time of maxima in the ≅11-year cycle in solar sunspot occurrence. Tasmania is the Australian state from which the aurora australis is most commonly seen, as it is closest to the normal location of the auroral oval.
The global distribution of auroral activity is an oval around the magnetic poles in both hemispheres. As the level of magnetic disturbance of the Earth’s magnetic field increases, the oval of auroral activity expands equator-ward. At times it expands over Tasmania. The most dramatic displays will most likely be observed when the aurora is overhead at around midnight. The earlier in the evening an auroral display is seen in the southern sky, the more likely it is that the display will be more spectacular and more overhead (or even to the north) at around midnight.
The chance of observing an aurora in Tasmania, on a clear night, averages out at around 1% to 2% and is strongly correlated with the sunspot cycle. Auroral displays are more common near the equinoxes (late March and September), but this does not preclude the occurrence of aurora at other times.