Database of measurements of magnetosonic equatorial noise emissions from measurements of the CLUSTER spacecraft

Details Database of measurements of magnetosonic equatorial noise emissions from measurements of the CLUSTER spacecraft Database of measurements of magnetosonic equatorial noise emissions from measurements of the CLUSTER spacecraft

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm21a1667h&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM21A-1667

Physics

2730 Magnetosphere: Inner, 2772 Plasma Waves And Instabilities (2471), 6939 Magnetospheric Physics (2700), 6984 Waves In Plasma (7867)

Scientific paper

Equatorial noise is an intense wave emission generated by unstable ion distributions. It occurs in the inner magnetosphere at frequencies below the local lower hybrid frequency. Recent studies have shown that these waves could be able to contribute to the local acceleration of energetic electrons in the outer Van Allen belts. We present a unique database of many observations of equatorial noise selected from wave measurements obtained by the four CLUSTER spacecraft. All these events have been visually selected from the onboard-analyzed time-frequency spectrograms and from the wave polarization data recorded by the STAFF-SA instruments, and from high-resolution spectrograms obtained from the measurements of the WBD instruments. Our database includes all available measurements between 2001 and 2007. We construct a list of events, which are selected according to several criteria. We choose data measured within 5 degrees of the geomagnetic equator, where emissions below the lower hybrid frequency are clearly visible in both the magnetic and electric field spectrograms, with power-spectral densities of at least 10-6 nT2Hz-1 and 10-5 mV2m-2Hz-1, respectively. We also select only those events which have nearly linearly polarized magnetic field fluctuations, with ellipticities from -0.2 to 0.2, consistent with published past observations. Obtained results show that equatorial noise is present at all magnetic local times. We show examples of fine spectral structures in the observed equatorial noise emissions.

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