Pc 1-2 Waves and Energetic Particle Precipitation During and After Magnetic storms: Superposed Epoch Analysis and a Case Study

Details Pc 1-2 Waves and Energetic Particle Precipitation During and After Magnetic storms: Superposed Epoch Analysis and a Case Study Pc 1-2 Waves and Energetic Particle Precipitation During and After Magnetic storms: Superposed Epoch Analysis and a Case Study

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm41b1463e&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM41B-1463

Physics

2716 Energetic Particles: Precipitating, 2752 Mhd Waves And Instabilities (2149, 6050, 7836), 2774 Radiation Belts, 2788 Magnetic Storms And Substorms (7954)

Scientific paper

Magnetic pulsations in the Pc 1-2 frequency range (0.1-5 Hz) are often observed on the ground and in Earth's magnetosphere during the aftermath of geomagnetic storms. Numerous studies have suggested that they may play a role in reducing the fluxes of energetic ions in the ring current; more recent studies suggest they may interact parasitically with radiation belt electrons as well. We report here on observations during 2005 from three-axis search coil magnetometers installed at Halley, Antarctica (-61.84° MLAT), South Pole (- 74.18° MLAT), and McMurdo (-79.96° MLAT), from riometers at Halley and South Pole, and from energetic particle detectors on the POES and SAMPEX satellites. A superposed epoch analysis based on 13 magnetic storms between April and September 2005, as well as case studies, show that narrowband Pc 1-2 waves are rarely if ever observed on the ground during the main and early recovery phases of magnetic storms. However, intense broadband Pi 1-2 ULF noise, accompanied by strong riometer absorption signatures, does occur during these times. As storm recovery progresses, wave occurrence increases, at first in the daytime and especially afternoon sectors, and later in the recovery phase (typically by days 3 or 4) at essentially all local times. We also present evidence that during the early storm recovery phase the propagation of Pc 1-2 waves through the ionospheric waveguide to higher latitudes is more severely attenuated. These observations are consistent with suggestions that Pc 1-2 waves occurring during the early recovery phase of magnetic storms are generated in association with duskside plasmaspheric plumes, and provide additional evidence that the propagation of waves to the ground is inhibited during the early phases of such storms. Analysis of >30 keV proton data from four POES satellites in near-polar low Earth orbit shows increases in precipitating flux in good association with several of the wave events observed.

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