Speaker
Description
Fifty years after the Burton equation proposal for the coupling between solar wind and magnetosphere, as quantified by the Dst index, this work proposes a missing term for the injection of energy from the solar wind into the ring current. This term is associated with Alfvén waves and allows us to explain the linear trend observed in the recovery phase of Dst or SYM-H indices during the passage of high speed streams from coronal holes. Using interplanetary and geomagnetic measurements, we select four case studies, validate our approach, and compute the parameters involved in the proposed theoretical expression for the injection of energy from the solar wind into the ring current due to Alfvénic fluctuations. Our results demonstrate that the linear trend in the recovery phase of geomagnetic storms associated with high speed streams, when compared to the exponential or hyperbolic trend, is not a different behavior of the magnetosphere, but the result of an injection of energy due to Alfvén waves, which was neglected in previous models.
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