1School of Electrical Engineering, Royal Institute of Technology KTH, Stockholm, Sweden
2School of Physics and Astronomy, University of Southampton, Southampton, UK
Received: 20 Jan 2017 – Accepted: 28 Feb 2017 – Published: 22 Mar 2017
Abstract. Non-thermal echoes in incoherent scatter radar observations are occasionally seen in the high-latitude ionosphere. Such anomalous echoes are a manifestation of plasma instabilities on spatial scales matching the radar wavelength. Here we investigate the occurrence of a class of spatially localized anomalous echoes with an enhanced zero Doppler frequency feature and their relation to auroral particle precipitation. The ionization profile of the E region is used to parametrize the precipitation, with nmE and hmE being the E region peak electron density and the altitude of the peak, respectively. We find the occurrence rate of the echoes to generally increase with nmE and decrease with hmE, thereby indicating a correlation between the echoes and high-energy flux precipitation of particles with a high characteristic energy. The highest occurrence rate of > 20 % is found for hmE = 109 km and nmE = 1011. 9 m−3, averaged over the radar observation volume.
Dahlgren, H., Schlatter, N. M., Ivchenko, N., Roth, L., and Karlsson, A.: Relation of anomalous F region radar echoes in the high-latitude ionosphere to auroral precipitation, Ann. Geophys., 35, 475-479, doi:10.5194/angeo-35-475-2017, 2017.