Propagation and dispersion of electrostatic waves in the ionospheric E region
- 1University of Oslo, Institute of Physics, P.O. Boks 1048 Blindern, N-0316 Oslo, Norway
- 2University of Oslo, Institute of Theoretical Astrophysics, P.O. Boks 1029 Blindern, N-0315 Oslo, Norway
- 3Technical University of Denmark, Department of Automation, DK-2800 Lyngby, Denmark
- 4Max-Planck-Insitut für Aeronomie, Postfach 20, D-37189 Katlenburg-Lindau, Germany
Abstract. Low-frequency electrostatic fluctuations in the ionospheric E region were detected by instruments on the ROSE rockets. The phase velocity and dispersion of plasma waves in the ionospheric E region are determined by band-pass filtering and cross-correlating data of the electric-field fluctuations detected by the probes on the ROSE F4 rocket. The results were confirmed by a different method of analysis of the same data. The results show that the waves propagate in the Hall-current direction with a velocity somewhat below the ion sound speed obtained for ionospheric conditions during the flight. It is also found that the waves are dispersive, with the longest wavelengths propagating with the lowest velocity.