First EISCAT Two‐Radar Plasma Line Experiment

Abstract

This paper reports the first EISCAT two‐radar plasma line experiment measuring photoelectron‐enhanced plasma lines with the UHF (933 MHz) and VHF (224 MHz) radars. The experiment shows that near noon at midsummer, simultaneous plasma lines can be continuously detected with the two radars in the altitude region 140–280 km. Such observations allow the electron temperature to be determined independently of observations of the ion part of the incoherent spectrum. Examples are given to illustrate this application.