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Shocklets and Short Large Amplitude Magnetic Structures (SLAMS) in the High Mach Foreshock of Venus
NASA Goddard Space Flight Center, Greenbelt, MD, USA; The Catholic University of America, Washington, DC, USA.
School of Physical and Chemical Sciences, Queen Mary, University of London, London, UK.
Technische Universität Braunschweig, Braunschweig, Germany.
KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering, Space and Plasma Physics.ORCID iD: 0000-0003-1270-1616
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2023 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 50, no 18, article id e2023GL104610Article in journal (Refereed) Published
Abstract [en]

Shocklets and short large-amplitude magnetic structures (SLAMS) are steepened magnetic fluctuations commonly found in Earth's upstream foreshock. Here we present Venus Express observations from the 26th of February 2009 establishing their existence in the steady-state foreshock of Venus, building on a past study which found SLAMS during a substantial disturbance of the induced magnetosphere. The Venusian structures were comparable to those reported near Earth. The 2 Shocklets had magnetic compression ratios of 1.23 and 1.34 with linear polarization in the spacecraft frame. The 3 SLAMS had ratios between 3.22 and 4.03, two of which with elliptical polarization in the spacecraft frame. Statistical analysis suggests SLAMS coincide with unusually high solar wind Alfvén mach-number at Venus (12.5, this event). Thus, while we establish Shocklets and SLAMS can form in the stable Venusian foreshock, they may be rarer than at Earth. We estimate a lower limit of their occurrence rate of ≳14%.

Place, publisher, year, edition, pages
American Geophysical Union (AGU) , 2023. Vol. 50, no 18, article id e2023GL104610
Keywords [en]
foreshock, induced magnetosphere, shocklets, SLAMS, solar wind, Venus
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:kth:diva-338352DOI: 10.1029/2023GL104610Scopus ID: 2-s2.0-85173013161OAI: oai:DiVA.org:kth-338352DiVA, id: diva2:1806270
Note

QC 20231020

Available from: 2023-10-20 Created: 2023-10-20 Last updated: 2023-11-21Bibliographically approved

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Karlsson, TomasRaptis, Savvas

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