Space Physics Seminar

semester, 2009


Tuesday, January 20th 2009
1:00 pm:
Space Physics Seminar in 143 Physics
There will be no seminar this week.

Tuesday, January 27th 2009
12:20 pm:
Space Physics Seminar in 143 Physics
Subject: Organizational Meeting
Note change of time will hold for the semester.

Tuesday, February 3rd 2009
12:20 pm:
Space Physics Seminar in 143 Physics
Speaker: Bob Lysak, University of Minnesota
Subject: Alfvenic Aurora and Substorm Onset.

Tuesday, February 10th 2009
12:20 pm:
Space Physics Seminar in 143 Physics
Speaker: John Dombeck, University of Minnesota
Subject: Computer data analysis in space physics

Tuesday, February 17th 2009
12:20 pm:
Space Physics Seminar in 143 Physics
Speaker: Aaron Breneman, University of Minnesota
Subject: To be announced.

Tuesday, February 24th 2009
12:20 pm:
Space Physics Seminar in 143 Physics
Speaker: David Murr, Augsburg College
Subject: Initial Observations of Large Amplitude Pc5 Waves using GPS TEC

Tuesday, March 3rd 2009
12:20 pm:
Space Physics Seminar in 143 Physics
Speaker: Kris Kersten, University of Minnesota
Subject: Simulating electron energization and loss in the radiation belts

Tuesday, March 10th 2009
12:20 pm:
Space Physics Seminar in 143 Physics
Speaker: Jim Crumley, St. John's University
Subject: Ion Composition Effects on Ion Cyclotron Waves Observed by FAST in the Auroral Zone

Tuesday, March 17th 2009
12:20 pm:
Space Physics Seminar in 143 Physics
There will be no seminar this week.

Tuesday, March 24th 2009
12:20 pm:
Space Physics Seminar in 143 Physics
Speaker: Scott Thaller, University of Minnesota
Subject: Polar spacecraft observations of time varying, field aligned Poynting flux and electron kinetic energy flux observed by FAST during a major geomagnetic storm in the inner magnetosphere

Tuesday, March 31st 2009
12:20 pm:
Space Physics Seminar in 143 Physics
Speaker: Lei Dai, University of Minnesota
Subject: Cluster observations of the dynamics and structure of waves driven by reconnection jets in the Geomagnetic tail

Tuesday, April 7th 2009
12:20 pm:
Space Physics Seminar in 143 Physics
Speaker: Jesse Woodroffe, University of Minnesota
Subject: Alfven Waves and the Dynamics of Nearly Incompressible Plasmas

Tuesday, April 14th 2009
12:20 pm:
Space Physics Seminar in 143 Physics
Speaker: Cindy Cattell, University of Minnesota
Subject: Running a lab plasma experiment at LAPD: Intro to mode conversion and preliminary results

Tuesday, April 21st 2009
12:20 pm:
Speaker: Adam Hupach
Subject: Physical Properties of Electron Solitary Waves in the Earth's Magnetosphere

Tuesday, April 28th 2009
12:20 pm:
Speaker: Dr. John Dombeck, U of M
Subject: Findings on Intense Auroral Electrons During Large Geomagnetic Storms

Tuesday, May 5th 2009
12:20 pm:
Space Physics Seminar in 143 Physics
Speaker: Eric Donovan, University of Calgary
Subject: New Perspectives on Auroral Arcs

We do not know how auroral arcs are formed, whether or not there are different types of arcs (meaning different underlying physics), and what they correspond to in the magnetosphere. Given the ubiquity of arcs and their obvious importance to processes such as the substorm, resolving the questions we have about arcs has got to be one of the key questions in space physics. In this talk I will survey recent observations that I believe will be important to our ultimate understanding of this space physical phenomena. These observations included the differences between meso-scale (~10 km) and small-scale arcs, the orientation of arcs and their longitudinal extension across many hours of local time, the fact that arcs occur polewards of the ion isotropy boundary, waves that propagate along arcs, and the fact that some arcs oscillate and others do not. I will finish with an overview of how I think these observations relate to theories of arc formation.


Tuesday, May 12th 2009
12:20 pm:
Space Physics Seminar in 143 Physics
No seminar this week. Finals week.

Tuesday, September 15th 2009
12:20 pm:
Space Physics Seminar in 143 Physics
Speaker: Bob Lysak, University of Minnesota
Subject: Alfven Waves, Aurora and Substorms: A Tutorial

Tuesday, September 22nd 2009
12:20 pm:
Space Physics Seminar in 143 Physics
Speaker: Dr. Yukitoshi Nishimura, UCLA and Nagoya University
Subject: Substorm auroral onset by earthward intrusion of new plasma: THEMIS imager and spacecraft observations.

Tuesday, September 29th 2009
12:20 pm:
Space Physics Seminar in 143 Physics
To be announced.

Tuesday, October 6th 2009
12:20 pm:
Space Physics Seminar in 143 Physics
Speaker: Aaron Breneman, University of Minnesota
Subject: Observations of Large Amplitude, Monochromatic Whistlers at Stream Interaction Regions

Tuesday, October 13th 2009
12:20 pm:
Space Physics Seminar in 143 Physics
Speaker: Dr. Chris Colpitts, Dartmouth University
Subject: “Swishers” and “Stripes”: Examinations of Dispersed Features of Auroral HF Waves Observed with Sounding Rockets

Earth’s high latitude ionosphere, highly disturbed by the particle and energy inputs and associated aurora, is the stage for plasma wave activity across a wide range of frequencies. These waves often exhibit strikingly distinct time-frequency structure which can have relatively direct explanations based on the dispersion relations of the appropriate normal modes of the plasma. Hence, they present an opportunity to confirm basic plasma physics. Moreover, once a physical explanation is proven for these emissions, it is often possible to exploit the structured waves to either measure characteristics of the local plasma or remotely sense characteristics of plasmas through which the waves have propagated. Observations of structured HF emissions from three recent auroral sounding rockets are presented.Identifying the wavemode of observed emissions is the first step in characterizing them, and I will present a novel technique that has been developed to constrain the mode of observed emissions by taking advantage of the orientation of the electric field sensors. In addition, auroral rocket observations of two structured emissions having distinct frequency-time patterns, “swishers” and “stripes,” are investigated. Ray-tracing and growth rate calculations provide effective tests of the mode identification and possible generating mechanisms of these emissions. Lastly, rocket observations of waveform statistics and spectra of short intense bursts of Langmuir waves in the polar cusp ionosphere reveal information about the modulation of these waves and the density fluctuations in which they arise. Taken together, the observations of these dispersed features and the development of new techniques to constrain their modes and identify their generation mechanisms add to our existing knowledge of the auroral ionosphere and show promise in remote sensing plasma characteristics elsewhere in the Earth’s magnetosphere and beyond.


Tuesday, October 20th 2009
12:20 pm:
Space Physics Seminar in 143 Physics
Speaker: Bela Fejer, Utah State University
Subject: Dynamics of the Equatorial Electric Field

Tuesday, October 27th 2009
12:20 pm:
Space Physics Seminar in 143 Physics
Speaker: Jesse Woodroffe, University of Minnesota
Subject: The global structure of magnetospheric ultra low frequency waves and its relation to ionospheric conductivity.

Tuesday, November 3rd 2009
12:20 pm:
Space Physics Seminar in 143 Physics
To be announced.

Tuesday, November 10th 2009
12:20 pm:
Space Physics Seminar in 143 Physics
Speaker: Jesse Woodroffe, University of Minnesota
Subject: The global structure of magnetospheric ultra low frequency waves and its relation to ionospheric conductivity

Tuesday, November 17th 2009
12:20 pm:
Space Physics Seminar in 143 Physics
Speaker: Lynn B. Wilson III, University of Minnesota
Subject: Strong Particle Heating at an Atypical Interplanetary Shock

Tuesday, November 24th 2009
12:20 pm:
Space Physics Seminar in 143 Physics
Speaker: Lei Dai, University of Minnesota
Subject: Wave dynamics in the geomagnetic tail

Tuesday, December 1st 2009
12:20 pm:
Space Physics Seminar in 143 Physics
Speaker: John Dombeck, University of Minnesota
Subject: Evidence for Nightside Low-Latitude Low-Potential Inverted-V and Alfvénic Accelerated Electron Precipitation During Large Geomagnetic Storms

Tuesday, December 8th 2009
12:20 pm:
Space Physics Seminar in 143 Physics
Speaker: Kris Kersten, University of Minnesota
Subject: Langmuir wave generation and mode conversion on linear density structures in a laboratory plasma

Tuesday, December 15th 2009
12:20 pm:
Space Physics Seminar in 143 Physics
There will be seminar this week.

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