| Aug. |
25 |
Giovanni Lapenta
KU Leuven, Belgium |
"A fast regime of reconnection in high Lundquist number plasmas" |
LSTB-206
3:30-4:30pm |
| Sept. |
01 |
*** OPEN *** |
Cancelled |
|
| Sept. |
08 |
Bob Ergun (LASP) |
"Observations of double layers in Earth's plasma sheet" |
LSTB-206
3:30-4:30pm |
| Sept. |
15 |
Jeffrey Love (USGS) |
"Movie-maps of low-latitude storm-time magnetic disturbance" |
LSTB-206
3:30-4:30pm |
| Sept. |
22 |
Jack Gosling (LASP) |
"A one-sided aspect of Alfvenic fluctuations in the solar wind" |
LSTB-206
3:30-4:30pm |
| Sept. |
29 |
Yi-Jiun Su (AFRL) |
"Assimilative modeling of large-scale equatorial plasma trenches observed by the Communication/Navigation Forecasting System (C/NOFS)" |
LSTB-206
3:30-4:30pm |
| Oct. |
06 |
Wenlong Liu (LASP) |
"THEMIS observation of ULF waves in the inner magnetosphere" |
LSTB-206
3:30-4:30pm |
| Oct. |
08 |
Patrick Newell (JHU/APL) |
"Diffuse, monoenergetic, broadband (wave) and ion aurora:
Results from a new generation precipitation model" |
LSTB-299 (Auditorium)
1:30-2:30pm |
| Oct. |
13 |
David Malaspina (LASP) |
"Measurement of high frequency density turbulence in the solar wind" |
LSTB-206
3:30-4:30pm |
| Oct. |
20 |
Weichao Tu (LASP) |
"Quantification of the precipitation loss of radiation belt electrons observed by SAMPEX"
Abstract:
Based on SAMPEX/PET observations, the rates and the spatial and temporal variations of electron loss to the atmosphere in the Earth's radiation belt were quantified using a Drift-Diffusion model that includes the effects of azimuthal drifts and pitch angle diffusion. The measured electrons by SAMPEX can be distinguished as trapped, quasi-trapped (in the drift loss cone), and precipitating (in the bounce loss cone). The Drift-Diffusion model simulates the low-altitude electron distribution from SAMPEX. After fitting the model results to the data, the magnitudes and variations of the electron lifetime can be quantitatively determined based on the optimum model parameter values. Three magnetic storms of different magnitudes were selected to estimate the various loss rates of ~0.5 to 3 MeV electrons during different phases of the storm and at L shells ranging from L=3.5 to L=6.5 (L represents the radial distance in the equatorial plane under a dipole field approximation). They are a small storm and a moderate storm in the current solar minimum and an intense storm right after the previous solar maximum. Model results for the three individual events showed that fast precipitation losses of relativistic electrons, as short as hours, persistently occurred in the storm main phases and with more efficient loss at higher energies, over wide range of L regions and over all the SAMPEX covered local times. In addition to this newly discovered common feature of the main phase electron loss for all the storm events and at all L locations, some other properties of the electron loss rates that vary with time or locations, were also estimated and discussed. This method combining model with the low-altitude observations provides direct quantification of the electron loss rate, a prerequisite for any comprehensive modeling of the radiation belt electron dynamics. |
LSTB-206
3:30-4:30pm |
| Oct. |
27 |
Sebastien Hess (LASP) |
"From satellite-magnetosphere interaction to auroral emissions:
Power transfer and electron acceleration" |
LSTB-206
3:30-4:30pm |
| Nov. |
03 |
Makenzie Lystrup (LASP) |
"Ground-based observations of Jupiter's H3+ infrared aurora" |
LSTB-206
3:30-4:30pm |
| Nov. |
10 |
Wai-Leong Teh (LASP) |
"THEMIS observation of reconnection-associated Hall field at the magnetopause: First results from Hall MHD-based reconstruction" |
LSTB-206
3:30-4:30pm |
| Nov. |
17 |
Matthew McHarg (USAF Academy) |
"Flickering aurora studies using high speed cameras" |
LSTB-206
3:30-4:30pm |
| Nov. |
24 |
*** FALL BREAK *** |
NO SEMINAR
|
|
| Dec. |
01 |
Laila Andersson (LASP) |
|
|
| Dec. |
08 |
Fall AGU practice |
|
|
| Dec. |
15 |
Fall AGU meeting
14-18 Dec. |
NO SEMINAR |
|
