Very large phase velocities of non two-stream, meter scale irregularities in the high latitude E region ionosphere

Journal Article · Sun Oct 01 04:00:00 EDT 1989 · Journal of Geophysical Research; (USA)

DOI:https://doi.org/10.1029/JA094iA10p13489· OSTI ID:5250354

Haldoupis, C; Nielsen, E ^[1]

---

1. Max-Planck Institute fuer Aeronomie, Katlenburg-Lindau, Federal Republic of Germany (DE)

We present experimental evidence on a new category of meter wavelength radio auroral irregularities characterized by a unique Doppler spectrum signature. The new echo type has been identified with the Scandinavian Twin Auroral Radar Experiment radars which are capable of observing simultaneously full Doppler spectra from the same scattering volume along two widely different azimuths. The new echoes were seen only by the Finalnd radar which observes at large angles to the electrojet flow and at times when the Norway radar observatory very stable type 1 echoes with phase velocities near the ion acoustic speed. The new spectrum, named type 5, is composed of three main frequency bands, two being symmetric about zero Doppler shift near {plus minus}450 m/s and a third always at very large phase velocities near 1000 m/s, this resulting to a characteristic asymmetry in the spectrum.

• OSTI ID: 5250354
• Journal Information: Journal of Geophysical Research; (USA), Journal Name: Journal of Geophysical Research; (USA) Vol. 94:A10; ISSN 0148-0227; ISSN JGREA
• Country of Publication: United States
• Language: English

Related Subjects

640201* -- Atmospheric Physics-- Auroral
Ionospheric
& Magetospheric Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ACOUSTIC RADAR
AURORAE
DOPPLER EFFECT
E REGION
EARTH ATMOSPHERE
GEOMAGNETIC FIELD
GYROFREQUENCY
INSTABILITY
ION ACOUSTIC WAVES
ION WAVES
IONOSPHERE
MAGNETIC FIELDS
MEASURING INSTRUMENTS
PLANETARY IONOSPHERES
PLASMA DRIFT
PLASMA INSTABILITY
PLASMA MICROINSTABILITIES
PLASMA WAVES
RADAR
RANGE FINDERS
TWO-STREAM INSTABILITY
VELOCITY