[IGPP Everyone] Reminder - Today - Friday - SPACE SCIENCE SEMINAR - WINTERQUARTER -Geology 6704- 3:30pm -Friday March 6, 2020

[Marjorie Sowmendran]

Today!

SPACE PHYSICS SEMINAR

DEPARTMENT OF EARTH, PLANETARY, AND SPACE SCIENCES

DEPARTMENT OF ATMOSPHERIC AND OCEANIC SCIENCES

UNIVERSITY OF CALIFORNIA, LOS ANGELES

(AOS M275B, EPSS M288B)







Solar Terrestrial Interactions: The Ionospheric Signatures 

Gerard Fasel

Pepperdine University

Abstract: Understanding space weather and how it affects the Earth’s terrestrial environment is as important to humankind as knowing what the global weather conditions are on any particular day.  Yet, these Solar-Terrestrial interactions are still not well understood.  The Sun generates a wind, which consists of charged particles, mostly protons and electrons, which are constrained to move along the Interplanetary Magnetic Field (IMF).  The solar wind is constantly interacting with our terrestrial environment. Magnetic reconnection, first proposed by Dungee in 1961, is the most understood among these interactions. This occurs when the IMF reconnects to the Earth’s magnetic field, causing thermal energy to be transmitted down into the ionosphere and creating the aurora in both the northern (aurora borealis) and southern hemispheres (aurora australis).  Polar-moving auroral forms are believed to be the ionospheric signatures of magnetic reconnection on the dayside magnetopause.  Certain solar wind conditions, often resulting from solar storms such as coronal mass ejections, can create extremely active auroral displays known as geomagnetic storms.

This talk will look at dayside ionospheric signatures due to solar-terrestrial interactions.  A new aurora, foreshock aurora, due to a massive compression of the magnetosheath and bow shock will be introduced.  Generally, when the IMF Bz-component is negative, the auroral oval generally expands equatorward.  Several examples will be presented when the dayside auroral oval does not expand for Bz<0 conditions.  Finally, some updated information regarding PMAFs and their connection to magnetic reconnection will be discussed.

 Friday March 6, 2020

Room 6704 Geology

3:30 - 5:00 PM

In-charge: C. T. Russell 
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