Manuela Temmer
Institute for Geophysics, Astrophysics and Meteorology, University of Graz, Universitätsplatz 5, A-8010 Graz, Austria, Institute for Geophysics, Astrophysics and Meteorology, University of Graz, Universitätsplatz 5, A-8010 Graz, Austria
Author ProfileAbstract
Magnetosheath jets constitute a significant coupling effect between the
solar wind (SW) and the magnetosphere of the Earth. In order to
investigate the effects and forecasting of these jets, we present the
first-ever statistical study of the jet production during large-scale SW
structures like coronal mass ejections (CMEs), stream interaction
regions (SIRs) and high speed streams (HSSs). Magnetosheath data from
Time History of Events and Macroscale Interactions during Substorms
(THEMIS) spacecraft between January 2008 to December 2020 serve as
measurement source for jet detection. Two different jet definitions were
used to rule out statistical biases induced by our jet detection method.
For the CME and SIR+HSS lists, we used lists provided by literature and
expanded on incomplete lists using OMNI data to cover the time range of
May 1996 to December 2020. We find that the number and total time of
observed jets decrease when CME-sheaths hit the Earth. The number of
jets is lower throughout the passing of the CME-magnetic ejecta (ME) and
recovers quickly afterwards. On the other hand, the number of jets
increases during SIR and HSS phases. We discuss a few possibilities to
explain these statistical results.