What is most likely to result in auroral propagation?
Meteor showers
Quiet geomagnetic conditions
Severe geomagnetic storms✓Правильный ответ
Extreme low-pressure areas in polar regions
Объяснение
Auroral propagation needs the dense, field-aligned ionization of an active auroral oval, which appears when charged particles from the Sun are funnelled into the polar upper atmosphere during a severe geomagnetic storm. Quiet geomagnetic conditions are the opposite case, meteor showers produce a different and unrelated scattering mechanism, and surface air pressure has no effect at ionospheric heights.