Assessing the global Alfvén wave power flow into and out of the auroral acceleration region during geomagnetic storms

Andreas Keiling, Scott Thaller, John Wygant, John Dombeck

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Geomagnetic storms are large space weather events with potentially tremendous societal implications. During these storms, the transfer of energy from the solar wind into geospace is largely increased, leading to enhanced energy flow and deposition within the magnetosphere and ionosphere. While various energy forms participate, the rate of total Alfvén wave energy flowing into the auroral acceleration region—where the magnetosphere and ionosphere couple—has not been quantified. Here, we report a fourfold increase in hemispherical Alfvénic power (from 2.59 to 10.05 GW) over a largely expanded oval band covering all longitudes and latitudes between 50° and 85° during the main storm phase compared with nonstorm periods. The Poynting flux associated with individual Alfvén waves reached values of up to about 0.5 W/m2 (mapped to ionospheric altitude). These results demonstrate that Alfvén waves are an important component of geomagnetic storms and associated energy flow into the auroral acceleration region.

Original languageEnglish (US)
Article numbereaav8411
JournalScience Advances
Volume5
Issue number6
DOIs
StatePublished - 2019

Bibliographical note

Funding Information:
This research was supported by the NSF grant AGS-1613134 and the NASA grants NNX16AG67G and NNX10AL03G.

PubMed: MeSH publication types

  • Journal Article

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