For ten points, identify these fluctuations in the Earth's magnetic field caused by disturbances arriving via solar wind.
An advance warning of one of these events can be provided if the shock at the L1 Lagrange point can be detected. These phenomena induce variations in a quantity known as TEC, the "total electron content," and the energy transferred during one of these events is measured with the Dst index. The severity of these events is typically measured using the Ap index, with an Ap index of over 100 signifying a major one of these events. These events typically occur in three phases, beginning with a "sudden commencement," corresponding to a field intensification at ground level, followed by "initial," and "main," phases during the latter of which a ring current induces a drop in field intensity. These events occur shortly following such events as a solar flare or a coronal mass ejection and result in the compression of the magnetosphere by the associated plasma flow. For ten points, identify these fluctuations in the Earth's magnetic field caused by disturbances arriving via solar wind.
An advance warning of one of these events can be provided if the shock at the L1 Lagrange point can be detected.
geomagnetic storms