Location
Yosemite National Park
Start Date
2-11-2014 10:30 AM
End Date
2-11-2014 11:00 AM
Description
The RBSPICE instruments on the Van Probes spacecraft provide measurements of the composition and energy spectra of ring current particles in Earth’s magnetosphere. The RBSPICE measurements from the two Van Allen Probe spacecraft yield data on the spatial and temporal variations of the ring current population during quiet and disturbed magnetic intervals. This presentation will summarize analyses to date, with concentrations on the helium and oxygen abundances, and changes in the abundance ratios relative to hydrogen throughout the mission. Following the injection of helium and oxygen into the magnetosphere at the times of geomagnetic disturbances, the oxygen fluxes are found to decay in intensity much more rapidly at all L-values than the helium increases. The relative contributions of the heavy species to the energy densities of the ring current during some disturbed intervals will be discussed. Composition data from the EPAM instrument on the L1 ACE spacecraft are used to investigate the relative contributions of interplanetary particles to the magnetosphere population during disturbed times.
Ring Current Measurements from the Van Allen Probes Mission
Yosemite National Park
The RBSPICE instruments on the Van Probes spacecraft provide measurements of the composition and energy spectra of ring current particles in Earth’s magnetosphere. The RBSPICE measurements from the two Van Allen Probe spacecraft yield data on the spatial and temporal variations of the ring current population during quiet and disturbed magnetic intervals. This presentation will summarize analyses to date, with concentrations on the helium and oxygen abundances, and changes in the abundance ratios relative to hydrogen throughout the mission. Following the injection of helium and oxygen into the magnetosphere at the times of geomagnetic disturbances, the oxygen fluxes are found to decay in intensity much more rapidly at all L-values than the helium increases. The relative contributions of the heavy species to the energy densities of the ring current during some disturbed intervals will be discussed. Composition data from the EPAM instrument on the L1 ACE spacecraft are used to investigate the relative contributions of interplanetary particles to the magnetosphere population during disturbed times.