Engineering-Physics Plasma Seminars

Winter 2012
Tuesdays at 3:30pm

Room 200, Cummings Hall

Directions

January 10

Matthew Gilson

"Simulations of the Nightside

Proton Precipitation during Substorms

using Global MHD and IMAGE

Observations"

January 17

Binzheng Zhang

"Effects of Soft Electron Precipitation on

the Coupled Magnetosphere-Ionosphere- Thermosphere"

January 24

David C. Montgomery

"The Effects of Boundary Conditions

on Turbulence"

January 31

Aleksandr y. Ukhorskiy

"RBSP Mission: Understanding Particle Accelerations and Electrodynamics of the Inner Magnetosphere"

February 7

Ellen Cousins

"Small-Scale Electric Field Variability

in the High-latitude Inospheres"

February 14

Micah Dombrowski

"Interpreting High-Frequency Vector

Electric Field Measurements in the

Cusp: Bursty Langmuir Waves on the

TRICE Sounding Rocket Mission"

February 21

Jeremy Ouellette

"Nightside Processes in Outflow

Driven Sawtooth Substorms"

February 28

Josh Semeter

"Substorm Imaging at 450 MHz: Recent Results from PFISR"

March 6

Oliver Brambles

Dartmouth College

Physics & Astronomy Thayer School of Engineering Engineering-Physics *Plasma Seminars*

*Winter 2012* Tuesdays at 3:30pm Room 200, Cummings Hall Directions January 10 Matthew Gilson "Simulations of the Nightside Proton Precipitation during Substorms using Global MHD and IMAGE Observations" January 17 Binzheng Zhang "Effects of Soft Electron Precipitation on the Coupled Magnetosphere-Ionosphere- Thermosphere" January 24 David C. Montgomery "The Effects of Boundary Conditions on Turbulence" January 31 Aleksandr y. Ukhorskiy "RBSP Mission: Understanding Particle Accelerations and Electrodynamics of the Inner Magnetosphere" February 7 Ellen Cousins "Small-Scale Electric Field Variability in the High-latitude Inospheres" February 14 Micah Dombrowski "Interpreting High-Frequency Vector Electric Field Measurements in the Cusp: Bursty Langmuir Waves on the TRICE Sounding Rocket Mission" February 21 Jeremy Ouellette "Nightside Processes in Outflow Driven Sawtooth Substorms" February 28 Josh Semeter "Substorm Imaging at 450 MHz: Recent Results from PFISR" March 6 Oliver Brambles Dartmouth College	Tuesday, March 6 "Magnetotail-Ionosphere Coupling in Fast Flow Channels" Oliver Brambles Dartmouth College ABSTRACT: The closure of open magnetic flux in the magnetotail by magnetic reconnection generates fast flows in the plasma sheet. These flows occur in a sequence of short bursts and have been found to be localized between 2100 and 0100 MLT, peaking in the duskside, pre-midnight sector. Auroral substorm expansions and the Alfvénic aurora show similar local time distributions to the fast flows in the plasma sheet. Controlled simulations using the LFM global model show that the dawn-dusk asymmetry of the fast flow channels and Alfvénic aurora is regulated by the spatial variation in ionospheric conductance. This asymmetry disappears when the conductance is taken to be spatially uniform. Furthermore, non-physical spatial variations in the ionospheric conductances can be used to produce fast flows which are predominantly on the dawn side. This talk will examine how the gradients in the ionospheric conductance affect the distribution of fast flows in the plasma sheet.
	https://engineering.dartmouth.edu/plasmaseminar/w12.html