ULF Waves in the Cusp Region as Observed by the SERSIO Sounding Rocket and on the Ground at Barentsburg, Svalbard

Details ULF Waves in the Cusp Region as Observed by the SERSIO Sounding Rocket and on the Ground at Barentsburg, Svalbard ULF Waves in the Cusp Region as Observed by the SERSIO Sounding Rocket and on the Ground at Barentsburg, Svalbard

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsm52a..07e&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SM52A-07

Computer Science

Sound

2407 Auroral Ionosphere (2704), 2431 Ionosphere/Magnetosphere Interactions (2736), 2481 Topside Ionosphere, 2487 Wave Propagation (0689, 3285, 4275, 4455, 6934), 2706 Cusp

Scientific paper

The SERSIO (Svalbard EISCAT Rocket Study of Ion Outflows) sounding rocket was launched on the 18nd of January, 2004 into an intense dayside aurora event driven by a CME. This event was also recorded by many instruments including all sky cameras, magnetometers and the EISCAT radar network. The magnetic footprint of the trajectory passed within 150 km of Barentsburg, Svalbard, where an induction coil magnetometer recorded intense pulsations. On the SERSIO payload the DC electric field instrument, sampled at 1000 Hz, showed spectral power from DC to ~100 Hz, the classic signature of BBELF waves, which are thought to be electrostatic and to have short wavelengths. On the ground, however, induction coil magnetometers recorded broad band waves with frequencies up to only a few Hz (but well below the upper limit of the frequency response of the coils). Previous work has shown that in order for a wave to be observable from the ground, two conditions must be met: 1) the wave must be electromagnetic in nature above the ionosphere and 2) it must have a perpendicular wavelength greater than ~2 km. This constraint suggests that the waves observed by SERSIO are actually comprised of two separate populations, including electrostatic BBELF waves with short wavelengths and electromagnetic waves with significanty larger perpendicular wavelengths. In this study, we compare in-situ observations of these waves to those on the ground, in conjunction with a numerical model that estimates the minimum perpendicular wavelength required to propagate through the ionosphere. These results confirm the suggestion that the signature observed by SERSIO actually includes two separate wave modes.

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