Sciences and Exploration Directorate

Upcoming Events

Tuesday, March 05, 2024
01:00 PM - 02:00 PM
Special HSD Seminar - Matti Ala-Lahti
Matti Ala-Lahti
University of Michigan

Solar wind monitor introduced uncertainties in space weather predictions during ICME sheaths
Abstract: Interplanetary coronal mass ejections (ICMEs) are vast, transient eruptions of plasma and magnetic field from the Sun. They often travel at supermagnetosonic speeds relative to the ambient solar wind, driving an interplanetary shock and sheath region in front of them. The expansion of an ICME introduces characteristics of an expansion sheath which makes ICME sheaths to differ from their planetary equivalents and thus, unique space plasma environments. ICME sheaths have a multi-scale structure regulated by several processes such as solar wind plasma crossing the shock and the plasma deflection around the ejecta. ICME sheaths contribute to the most severe geomagnetic storms and drive intense substorms, with the magnetosphere promptly responding to the discrete structures within the sheath. Understanding the magnetospheric dynamics during an ICME sheath passage is however challenging because of the localized nature of the sheath fluctuations. This seminar gives an overview to the current understanding about ICME sheaths and discusses their magnetospheric impact. Especially, the implications of the upstream solar wind monitor in ICME sheath – magnetosphere coupling studies are demonstrated: The spatial variations of ICME sheath mesoscale structure at L1 can result in substorm-level differences in space weather predictions.
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Tuesday, March 12, 2024
10:00 AM - 12:00 PM
ROSES Briefing
Briefing on the 2024 edition of SMD’s annual solicitation Research Opportunities in Space and Earth Sciences (ROSES), presented by Science Mission Directorate R&A Lead Dr. Max Bernstein. Max will describe the changes in ROSES and answer your questions about ROSES and related NASA proposal policy and guidelines.
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Wednesday, March 13, 2024
01:00 PM - 02:00 PM
SED Director’s Seminar
Please join us for SED Director's Seminar hosted by the X-ray Astrophysics Laboratory, Code 662!

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