University of Colorado at Boulder University of Colorado CU Home Search A to Z Index Map

"Friends of the Magnetosphere" Seminars

Below is a schedule of the informal LASP Friends of the Magnetosphere(FOM) Seminars for the Fall 2013 semester. 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.

For more information or if you have questions, please contact Rob.Wilson at lasp.colorado.edu

View the Address and Directions page for detailed directions to any of the LASP locations.



Full Schedule

Apr 29, 2014 – “Evolution of relativistic outer belt electrons during an extended quiescent period”

Speaker:   Allison Jaynes (LASP)
Date:   Apr 29, 2014
Time:   4:00 PM
Location:   LASP Space Science Building, room N248 upstairs. Map
Abstract:  

To effectively study loss due to precipitation of relativistic electrons in the radiation belt, it is necessary to isolate this loss by studying a time of relatively quiet geomagnetic activity. We present a case of initial enhancement and slow decay of 700 keV – 2 MeV electron populations in the outer radiation belt during an […]

Feb 04, 2014 – “Cassini Langmuir Probe observations in Saturn’s magnetosphere”

Speaker:   Michiko Morooka (LASP)
Date:   Feb 4, 2014
Time:   4:00 PM
Location:   LASP Space Science Building, room N248 upstairs. Map
Abstract:  

Cassini Langmuir probe was designed to measure the cold plasma properties. Analyzing its sweep current curve makes possible to estimate the densities of ions and electrons, ion speed, as well as the electron thermal energies independently. In addition, LP can estimate the electron densities of very thin plasma. As a result, LP can provide the […]

Feb 18, 2014 – “Formation of large-scale magnetic flux tubes in turbulence and turbulent convection: theory and numerical simulations”

Speaker:   Igor Rogachevskii (Ben-Gurion University of the Negev, Israel)
Date:   Feb 18, 2014
Time:   4:00 PM
Location:   LASP Space Science Building, room N248 upstairs. Map
Abstract:  

We present a review of theoretical results and detailed numerical simulations related to formation of large-scale magnetic flux tubes in turbulent flows. A suppression of total turbulent pressure by a large-scale (mean) magnetic field is one of the main reasons for formation of large-scale inhomogeneous magnetic structures in stratified turbulence. This effect mimics a negative […]

Mar 4, 2014 – “Review of global simulations studies of the effect of ionospheric outflow on magnetotail dynamics”

Speaker:   Michael Wiltberger (NCAR/HAO)
Date:   Mar 4, 2014
Time:   4:00 PM
Location:   LASP Space Science Building, room N248 upstairs. Map
Abstract:  

Since the detection of O+ ions by satellites in the 1970s it has been known that the ionosphere is an important source of plasma in the Earth’s magnetotail. More recent observations from have shown that these ions can become a dominant component of the plasma in the plasmasheet. Early work in substorm research considered a […]

Apr 1, 2014 – “Nonlinear Electric fields and Dipolarization Fronts in the Inner Magnetosphere”

Speaker:   David Malaspina (LASP)
Date:   Apr 1, 2014
Time:   4:00 PM
Location:   LASP Space Science Building, room N248 upstairs. Map
Abstract:  

Van Allen Probes observations are presented which demonstrate that dipolarization fronts penetrating Earthward of geosynchronous orbit lead to 1) localized enhancements of 1-30 keV electron fluxes and 2) formation of nonlinear electric field structures at the radial distances where wave-particle interactions drive outer radiation belt energization. Nonlinear electric field structures include nonlinear chorus, double layers, […]

Apr 8, 2014 – “Kinetic Simulations of Current Sheets for Different Stellar Magnetospheres”

Speaker:   Carrie Black (Goddard)
Date:   Apr 8, 2014
Time:   4:00 PM
Location:   LASP Space Science Building, room N248 upstairs. Map
Abstract:  

Current sheets are ubiquitous features in stellar atmospheres and exist across kinetic and MHD regimes. In the solar corona, the kinetic scales are far removed from the MHD scales, however, kinetic scale dynamics are believed to be important in diffusion regions where magnetic reconnection occurs. In pulsar magnetospheres, where relativistic pair plasmas exist, these scales […]

Apr 15, 2014 – “The Role of Magnetosheath Plasma Beta in the Formation of Alfven Wings and the Saturation of the Region 1 Field-Aligned Current System”

Speaker:   Frederick Wilder (LASP)
Date:   Apr 15, 2014
Time:   4:00 PM
Location:   LASP Space Science Building, room N248 upstairs. Map
Abstract:  

The phenomena of cross-polar cap potential (CPCP) and ionospheric field-aligned current (FAC) saturation remains largely unexplained. In recent years, empirical observations and statistical studies have been consistent with the Alfven Wing model. In this hypothesis the electric field of the solar wind MHD generator is partially reflected from the ionosphere due to a mismatch in […]

Past Seminars

Sep 17, 2013 – “MAVEN (Part 1): Why?”

Speaker:   Dave Brain (LASP)
Date:   Sep 17, 2013
Time:   4:00 PM
Location:   LASP Space Science Building, room N248 upstairs. Map
Abstract:  

Well…why not? I’ll review why we think the Martian climate has changed over time, and where the biggest holes in our understanding of climate evolution lie. This leads naturally into a presentation of the mechanisms by which atmosphere can escape from a planet, and a discussion of their importance today, and over the past 4+ […]

Sep 24, 2013 – “Magnetic Field Topology at Earth During Northward IMF Near Solstice”

Speaker:   Frederick Wilder (LASP)
Date:   Sep 24, 2013
Time:   4:00 PM
Location:   LASP Space Science Building, room N248 upstairs. Map
Abstract:  

When the interplanetary magnetic field (IMF) is northward, reconnection between the IMF and the geomagnetic field occurs at high latitudes on lobe/tail field lines poleward of the cusp. This reconnection leads to “reverse” convection in the polar ionosphere, with sunward flow at high latitudes. Over the past several decades, there has been significant debate regarding […]

Oct 1, 2013 – “MAVEN Overview part 2/2: How?”

Speaker:   Laila Andersson (LASP)
Date:   Oct 1, 2013
Time:   4:00 PM
Location:   LASP Space Science Building, room N248 upstairs. Map
Abstract:  

In part one we discussed what scientific questions are of interest at Mars. This week the MAVEN mission will be presented. The presentation will provide how the mission allows us address these questions. The focus is to provide information of the mission design, the planned operation and data flow, and how the different data sets […]

Oct 15, 2013 – “Predicting Solar Energetic Proton Levels in Real-Time”

Speaker:   Lisa Winter (AER)
Date:   Oct 15, 2013
Time:   4:00 PM
Location:   LASP Space Science Building, room N248 upstairs. Map
Abstract:  

Solar energetic particles (SEPs) are high-energy particles, such as protons, which are accelerated at the Sun and speed outward into the solar system. If they reach Earth, they can be harmful to satellites, ionospheric communications, and humans in space or on polar airline routes. NOAA defines an SEP event as an occasion when the flux […]

Oct 22, 2013 – “Yes, solar wind controls geomagnetic activity! But to what extent?”

Speaker:   Xinlin Li (LASP & Aerospace)
Date:   Oct 22, 2013
Time:   4:00 PM
Location:   LASP Space Science Building, room N248 upstairs. Map
Abstract:  

We will discuss the solar wind interaction with Earth’s magnetosphere based on several models that are developed recently to predict the daily averaged MeV electrons at geosynchronous orbit and the geomagnetic indices: Dst, AL, AU, and AE. The accuracy or lack of accuracy of these predictions demonstrate that solar wind controls the geomagnetic activity to […]

Oct 29, 2013 – “Adventures of a hybrid modeller in the inner Solar System”

Speaker:   Riku Jarvinen (FMI/LASP)
Date:   Oct 29, 2013
Time:   4:00 PM
Location:   LASP Space Science Building, room N248 upstairs. Map
Abstract:  

Global hybrid modelling is a way to study kinetic interactions of unmagnetized and weakly magnetized Solar System bodies with the solar wind. In a quasi-neutral hybrid code ions are treated as particle clouds moving under the Lorentz force and coupled self-consistently with electric and magnetic fields and electrons are a charge-neutralizing, massless fluid. HYB is […]

Nov 5, 2013 – “MAVEN’s Imaging UV Spectrograph: A Discussion on Magnetospheric Observables”

Speaker:   Nick Schneider (LASP)
Date:   Nov 05, 2013
Time:   4:00 PM
Location:   LASP Space Science Building, room N248 upstairs. Map
Abstract:  

Nick will lead a discussion on MAVEN’s Imaging UV Spectrograph, starting with the basics on the instrument’s ability to measure the atmosphere and ionosphere, and ending with topics of mutual interest such as the Martian aurora, solar wind interactions with the atmosphere, and the history of atmospheric escape.

Nov 12, 2013 – ” Vlasiator: Hybrid-Vlasov Simulation Code for the Earth’s Magnetosphere”

Speaker:   Sebastian von Alfthan (FMI)
Date:   Nov 12, 2013
Time:   4:00 PM
Location:   LASP Space Science Building, room N248 upstairs. Map
Abstract:  

Vlasiator is a global magnetospheric simulation code based on a hybrid-Vlasov description of plasma, where ions are represented by a six-dimensional distribution function, while electrons are modeled as a charge neutralizing fluid. The model provides uniformly discretized ion velocity distribution functions with quality comparable to spacecraft measurements. In this presentation Vlasiator and its numerical implementation […]

Nov 19, 2013 – “Extracting the DC Electric Field from THEMIS Observations Near Perigee”

Speaker:   Sam Califf (LASP)
Date:   Nov 19, 2013
Time:   4:00 PM
Location:   LASP Space Science Building, room N248 upstairs. Map
Abstract:  

The large-scale DC (and low-frequency) electric field plays a major role in the observed structure of the Earth’s magnetosphere. This electric field drives plasma Earthward from the magnetotail leading to the formation of the ring current, it affects the shape and size of the plasmasphere, and it can cause energetic electron enhancement through the slot […]

Nov 22, 2013 – “The influence of initial conditions in decaying MHD turbulence”

Speaker:   Vassilios Dallas (Ecole Normale Superieure, Paris)
Date:   Nov 22, 2013
Time:   11:00 AM
Location:   LASP Space Science Building, room N248 upstairs. Map
Abstract:  

We investigate the origins of the k^{−2} spectrum in a decaying Taylor-Green (TG) magnetohydrodynamic flow with zero large scale magnetic flux. From our TG numerical simulations, we demonstrate that magnetic discontinuities in the form of strong current sheets are responsible for the −2 power law scaling of the energy spectra in this flow. Therefore, the […]

Previous Seminars