Cascades2: Interferometric Measurements of Dispersive Alfven Wave Properties In a Poleward Boundary Intensification

Details Cascades2: Interferometric Measurements of Dispersive Alfven Wave Properties In a Poleward Boundary Intensification Cascades2: Interferometric Measurements of Dispersive Alfven Wave Properties In a Poleward Boundary Intensification

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm33a1884l&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM33A-1884

Physics

[2704] Magnetospheric Physics / Auroral Phenomena, [2712] Magnetospheric Physics / Electric Fields, [2716] Magnetospheric Physics / Energetic Particles: Precipitating, [2752] Magnetospheric Physics / Mhd Waves And Instabilities

Scientific paper

On March 20th, 2009 the auroral sounding rocket Cascades2 was launched into a region of active aurora located at the poleward boundary of the auroral oval. The rocket mission consisted of 5 instrumented sub-payloads: 2 electric/magnetic field payloads that were ejected at high velocity along the magnetic field line achieving a separation distance along the magnetic field B_0 of ~6.5km , 2 particle free fliers which were ejected in the plane perpendicular to B equipped with magnetometers and electron detectors, and a main payload instrumented with an ion gauge, magnetometer and two electron detectors. Upon entry into the poleward boundary, Cascades2 encountered a series of large, transient electric field structures with amplitudes up to ~200 mV/m. Collocated with these structures are series of the field aligned electron bursts. The transient electric fields are decomposed using the Morlet wavelet and a local frequency-wavenumber analysis is conducted. The results of this analysis compare favorably to the dispersion relation for inertial alfven waves (IAWs) in the auroral ionosphere and constitute the first direct measurement of the parallel wavelength of Alfven waves in the auroral ionosphere.

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