Quasiperiodic oscillations observed at the edge of an auroral arc by auroral turbulence 2

The Auroral Turbulence II (AT2) sounding rocket carried three payloads into the auroral ionosphere where they crossed several arc structures. At the border of an auroral arc a quasiperiodic structure was observed by the magnetic and electric field instruments as well as by the particle detectors. Th...

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Bibliographic Details
Published in:Geophysical research letters 1999-11, Vol.26 (22), p.3365-3368
Main Authors: Ivchenko, Nickolay, Marklund, Göran, Lynch, Kristina, Pietrowski, David, Torbert, Roy, Primdahl, Fritz, Ranta, Aarne
Format: Article
Language:English
Subjects:
Alfven Waves
Boundary
Cavity
Earth, ocean, space
Exact sciences and technology
External geophysics
Particle precipitation
Physics of the ionosphere
Sounding Rocket
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Summary:The Auroral Turbulence II (AT2) sounding rocket carried three payloads into the auroral ionosphere where they crossed several arc structures. At the border of an auroral arc a quasiperiodic structure was observed by the magnetic and electric field instruments as well as by the particle detectors. The variations were temporal oscillations, but existed only in a narrow (≈ 7 km) region transverse to the arc, with a correlation length along the arc of at least several km. The relation between the electric and magnetic field amplitude indicates the Alfvénic nature of the variations. Field aligned electron precipitation is correlated to the field variations. The narrow band nature of the oscillations and frequency around 0.6 Hz is consistent with waves confined in the ionospheric Alfvén resonator.
ISSN:0094-8276
1944-8007
1944-8007
DOI:10.1029/1999GL003588