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Magnetosphere Seminars – Spring 2008

Magnetosphere Seminars

Magnetosphere Seminars, aimed at scientists in the Boulder area, explore space physics and plasma research. (Courtesy Steele Hill/NASA)

Below is a schedule of the informal LASP Magnetospheres Seminars for the Spring 2008 semester. Except where noted, seminars will be held on Tuesday afternoons in room LSTB-206 at 3:30 pm.

LASP holds a series of informal seminars focused on space physics and plasma research relating to the magnetospheres of Earth and other planets. The intended audience is space and planetary physics researchers in the Boulder area, although in most instances any interested persons are welcome to attend.

 

 

 


Spring 2008

January 22, 2008

Magnetospheric ULF Pulsations driven by the Kelvin Helmholtz Instability in the Low-Latitude Boundary Layer

Speaker: Seth Claudepierre (LASP/CU APPMD)
Time: 3:30-4:30PM
Location: LSTB-206
Abstract: No abstract available
January 29, 2008

Results from statistical studies of auroral electric fields using Cluster

Speaker: Tommy Johansson (LASP)
Time: 3:30-4:30PM
Location: LSTB-206
Abstract: No abstract available
February 5, 2008

Ion Loss at Mars

Speaker: Laila Andersson (LASP)
Time: 3:30-4:30PM
Location: LSTB-206
Abstract: No abstract available
February 12, 2008

Studies of Magnetotail Dynamics and Energy
Evolution During Substorms Using MHD Simulations

Speaker: Sandra Brogl (FIT)
Time: 3:30-4:30PM
Location: LSTB-206
Abstract: No abstract available
February 19, 2008

A Statistical Comparison of Commonly Used External Magnetic Field Models

Speaker: James McCollough (LASP/CU Physics)
Time: 3:30-4:30PM
Location: LSTB-206
Abstract: No abstract available
February 26, 2008

Modeling energetic particle dynamics in Earth’s magnetosphere

Speaker: Scot Elkington (LASP)
Time: 3:30-4:30PM
Location: LSTB-206
Abstract: No abstract available
March 4, 2008

Evolution of Dayside Magnetopause Reconnection Exhaust Regions and FTE Genesis: THEMIS Observations

Speaker: Stefan Eriksson (LASP)
Time: 3:30-4:30PM
Location: LSTB-206
Abstract: No abstract available
March 11, 2008

Multifluid Simulations of the Magnetosphere

Speaker: John Lyon (Dartmouth College)
Time: 3:30-4:30PM
Location: LSTB-206
Abstract: No abstract available
March 18, 2008

Dynamics of relativistic electrons in the Earth’s radiation belts: energization and loss mechanisms

Speaker: Shri Kanekal (LASP)
Time: 3:30-4:30PM
Location: LSTB-206
Abstract: Current models of electron energization in the Earth’s magnetosphere may be broadly classified into two types. One class of models emphasize particle transport process such as enhanced radial diffusion as the domninant process and the second class invokes in-situ processes such as resonant or stochastic wave particle interactions. Wave particle interactions are also invoked as a mechanisms for relativistic electron loss. Relativistic electron flux variability is a balance between the processes of loss and energization. A major open scientific question is to quantify the relative contribution of these processes under specific driver conditions. We present observations of relativistic electrons made by spacecraft such as SAMPEX, POLAR, GOES, HEO and LANL geosynchronous spacecraft, specifically the measurements of electron spectra and time scales of flux decay, and isotropization during electron energization events. We discuss the nature of seasonal and solar cycle dependence upon electron energization characteristics. These results provide useful constraints on the models of electron energization.
April 1, 2008

Energetic upflowing ions: The quiet time problems

Speaker: Bill Peterson (LASP)
Time: 3:30-4:30PM
Location: LSTB-206
Abstract: No abstract available
April 8, 2008

Can The Kappa Distribution be the Result of the Random Walk of Plasma Sheet Electrons?

Speaker: Manny Presicci (LASP/CU Physics)
Time: 3:30-4:30PM
Location: LSTB-206
Abstract: No abstract available
April 15, 2008

Saturation of the polar cap potential

Speaker: Margaret Kivelson (DESS/IGPP, UCLA
Time: 3:30-4:30PM
Location: LSTB-206
Abstract: No abstract available
April 22, 2008

Title not available

Speaker: Syun Akasofu (U. Alaska, Fairbanks)
Time: 3:30-4:30PM
Location: LSTB-206
Abstract: No abstract available
April 29, 2008

The Role of Storm-time Pc5 Waves in Radial Transport of Radiation Belt Electrons

Speaker: Sasha Ukhorskiy (JHU/APL)
Time: 3:30-4:30PM
Location: LSTB-206
Abstract: Earth’s outer radiation belt is populated by relativistic electrons that produce a complex dynamical response to varying geomagnetic activity. One fundamental process defining global state of the belt is radial transport of electrons across their drift shells. In this study we investigate whether storm-time Pc5 waves are important as a mechanism of electron transport. Our analysis is based on satellite data analysis, analytical theory and numerical simulations. Storm-time Pc5 waves are driven by low frequency instabilities of ring current plasma (e.g. drift-mirror mode). Theoretical and observational analysis suggest that these waves propagate westward in a slow magnetosonic mode together with their energy source – ring current ions, are spatially localized in magnetic local time, and have high azimuthal wave numbers of 40-120. Subsequently these waves do not exhibit drift resonance with radiation belt electrons and have not been included in recent studies of radial transport mechanisms. Our test-particle analysis suggests that storm-time Pc5s can still be a very efficient driver of radial transport via non-resonant electron scattering by turbulent wave fields.



Previous Seminars