Direction Finding Errors Induced by Plasmawaves of the Ionosphere.

摘要

A super-resolution high frequency (HF) direction finding (DF) system has been used to measure the temporal characteristics of mid-latitude ionospheric irregularities. By analysis of the log power spectrum of the temporal profiles they are classified into six classes: (1) traveling wave packets (TWPs), (2) wave trains (WTs), (3) large-scale traveling disturbances at the terminator (TLSTIDs), (4) interference of different waves (IDW), (5) chaos and (6) quiet state. Their occurrence is correlated to the time of day, the ionospheric layer of reflection and the geomagnetic conditions which are expressed by the local K index. In total 192.25 hours of observation have been processed with a newly developed super-resolution DF algorithm which is suited for direction finding of moving incidence angles.