Discrete Frequency Magnetospheric Oscillations and Their Relation to Periodic Solar Wind Number Density Structures

Details Discrete Frequency Magnetospheric Oscillations and Their Relation to Periodic Solar Wind Number Density Structures Discrete Frequency Magnetospheric Oscillations and Their Relation to Periodic Solar Wind Number Density Structures

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsm42a..02v&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM42A-02

Physics

2700 Magnetospheric Physics (6939)

Scientific paper

Discrete magnetospheric oscillations near f = 1.3, 1.9, 2.6 and 3.4 mHz have been observed in satellite measurements, HF radar measurements, and ground magnetometer data for the last decade. Case studies have shown instances in which the apparent frequencies of periodic solar wind number density structures in Earth's reference frame correlate well with magnetospheric oscillations. This strongly suggests that the solar wind is sometimes a direct driver of discrete magnetospheric oscillations. We have recently completed a statistical analysis of periodic solar wind number density structures that indicated a preference for the solar wind to contain periodicities near the f = 1.3, 1.9, 2.6 and 3.4 mHz oscillations. In this paper we extend this analysis to magnetospheric data and determine the occurrence rate of statistically robust magnetospheric peaks in power spectra using data from GOES, ground magnetometers, Geotail, and LANL EP. We compare the occurrence rate of statistically significant spectral peaks in the magnetosphere to those observed upstream in the solar wind number density.

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