Bulletin of the American Physical Society
2017 Annual Meeting of the APS Mid-Atlantic Section
Volume 62, Number 19
Friday–Sunday, November 3–5, 2017; Newark, New Jersey
Session M6: Terrestrial Physics II |
Hide Abstracts |
Chair: Nathanial Frissell, New Jersey Institute of Technology Room: 220, Campus Center, NJIT |
Sunday, November 5, 2017 10:00AM - 10:36AM |
M6.00001: Bayesian Analysis of Whistler Mode Waves in the Radiation Belts Invited Speaker: Chris Crabtree We show how Bayesian techniques provide a general data analysis methodology that is better suited to investigate phenomena that require a nonlinear theory for explanation. In general, the approach allows for a systematic methodology for introducing increasingly complex theoretical inputs into the data processing pipeline. We will apply these techniques to investigate whistler mode chorus, lightning-generated whistlers, and plasmaspheric hiss in the Earth’s radiation belts. We will demonstrate how Bayesian techniques allow for the direct competition of different physical theories with data acting as the necessary arbitrator. In particular, we use our recently developed self-consistent Hamiltonian model for whistler mode sub-packet formation to develop parametrized model functions that we use to investigate the sub-packet structure of chorus found in burst-mode data from the Van Allen Probe mission. [Preview Abstract] |
Sunday, November 5, 2017 10:36AM - 11:12AM |
M6.00002: Geospace Measurements from the Antarctic Polar Cap: Fundamental Plasma Physics in Earth's Natural Laboratory Invited Speaker: Andrew Gerrard The near-Earth geospace environment is mostly controlled by the geomagnetic field that protects our technological and biological infrastructure from a variety of solar-produced phenomena, such as major solar storms caused by solar flares and coronal mass ejection. For example, these solar storms can severely impact artificial satellites/spacecraft, GPS systems, power distribution, and radio communication. The polar caps are specific areas around the Earth’s geomagnetic poles where the geomagnetic field lines are open and directly interact with the interplanetary magnetic field (i.e., the extended magnetic fields of the Sun). These regions thus allow unique studies of solar wind and magnetospheric coupling, and therefore are 1) at the cusp of space weather impacts, and 2) form a natural laboratory for studies of fundamental plasma physics. Though many geospace-monitoring stations are deployed over the northern polar cap and auroral zone on a regular basis the southern polar cap and auroral zone are left much behind due to the enormous logistical difficulties associated with Antarctic research. This talk will review a number of studies of interrelated geospace phenomena observed at the southern high latitudes through the coordinated and collaborative effort associated with deploying and maintaining respective instrumentation at the U.S. Antarctic stations, namely McMurdo, South Pole, and Palmer, as well as from the Automatic Geophysical Observatories (AGOs). The entire suite of geospace instrumentation at all of these stations has a sustained track-record of robust operation and community support, and includes fluxgate and search-coils magnetometers, ELF and VLF receivers, imaging and broadband riometers, sky-looking optical systems, GPS scintillation-rated receivers, and several other instruments. Measurements collected from these instruments can be synergistically combined for the studies of synoptic variability of the magnetospheric open-closed boundary and associated cusp structures, understanding ELF whistler events and their relationship to ionospheric conditions, doing VLF and HF diagnostics of magnetospheric conditions, and investigating the GPS signal scintillation occurrence and strength in relation to the magnetosphere-ionosphere coupling processes. [Preview Abstract] |
Sunday, November 5, 2017 11:12AM - 11:24AM |
M6.00003: Conjugate Observations of Electromagnetic Ion Cyclotron (EMIC) Waves Hyomin Kim, Marc Lessard, Andrew Gerrard, Eun-Hwa Kim This study presents space-ground conjugate observations of electromagnetic ion cyclotron (EMIC) waves to investigate characteristics of wave propagation from the magnetosphere to ionosphere in the context of geospace environment conditions. EMIC wave events are observed using data from the Van Allen Probes spacecraft. Wave activities at the conjugate locations on the ground are identified to examine their spatial and temporal occurrence and propagation characteristics. Differences in wave power, polarization, and spectral structure between events in space and on the ground are reported. The statistical survey results are compared with solar wind, geospace, and particle conditions to examine how wave propagation is affected by these conditions. [Preview Abstract] |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700