Magnetosheath jet occurrence in solar wind parameter space

Abstract

<p>Plasma jets in the magnetosheath are identified as strong local enhancements in dynamic pressure. Being created at the bow shock, they are able to traverse the entire magnetosheath and impact the magnetopause. There, they can severely indent the boundary, set up waves on it, and trigger magnetic reconnection. They are a key yet heavily underexplored element in the solar wind – magnetosphere coupling. Jets are mostly (but not exclusively) observed downstream of the quasi-parallel shock. Consequently, they have been observed significantly more often under low interplanetary magnetic field cone angle conditions.</p><p>In this study, we revisit the occurrence of jets, this time taking into account the whole space of parameters of solar wind input conditions. We answer the question where in this space jet occurrences cluster and how the emerging patterns change when the solar wind input becomes significantly different in nature, e.g., under the influence of coronal mass ejections or stream interaction regions.</p>

Magnetosheath Jet Occurrence Rate in Relation to CMEs and SIRs

“…We used the original list of jets from 2008 to 2012 for THEMIS A-E by Plaschke et al (2013) and the expanded list of jets using THEMIS A, D, and E from 2012 to 2018 (LaMoury et al, 2021;Plaschke et al, 2013). Both original lists are available online (Plaschke, Hietala, & Angelopoulos, 2020;Plaschke, Hietala, & LaMoury, 2020). We reforged the jet list to include the time range of 1 January 2018-2031 December 2020.…”

“…THEMIS and OMNI data were accessed using the SPEDAS software (Angelopoulos et al, 2019). Both original jet lists covering the time ranges of 2008-2012 and 2012-2018 are available online https://osf.io/gf732/ (Plaschke, Hietala, & Angelopoulos, 2020), https://osf.io/7rjs4/ (Plaschke, Hietala, & LaMoury, 2020). We provide the new jet lists (upstream and local criteria) as well as the magnetosheath times at https://osf.io/6ywjz/ (Koller et al, 2021).…”

Solar Wind Control of Magnetosheath Jet Formation and Propagation to the Magnetopause

“…In this study we use a database of 13,096 jet observations made by the five Time History of Events and Macroscale Interactions during Substorms spacecraft (THEMIS; Angelopoulos, 2008Angelopoulos, ) from 2008. Data are available from Plaschke, Hietala, and Angelopoulos (2020) for 2008-2011, and Plaschke, Hietala, and LaMoury (2020 for 2012-2018. Jets are selected from over 31 million (8,713.5 hours) magnetosheath measurements.…”

“…THEMIS and OMNI data can be accessed using the SPEDAS software (Angelopoulos et al, 2019). Jet and magnetosheath interval times are available at https://osf.io/ gf732/ (2008-2011 and https://osf.io/7rjs4/ (2012-2018; Plaschke, Hietala, & LaMoury, 2020).…”