Ionospheric Propagation Characteristics of MF Band Waves Observed in the Arctic

Ryouichi MATSUTANI  Masahiro NISHI  Koichi SHIN  Teruaki YOSHIDA  

B - Abstracts of IEICE TRANSACTIONS on Communications (Japanese Edition)   Vol.J98-B   No.3   pp.285-293
Publication Date: 2015/03/01
Online ISSN: 1881-0209
Type of Manuscript: PAPER
ionospheric propagation,  MF band waves,  Arctic area,  flare,  AE index,  interplanetary magnetic field,  

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Since solar activities affect ionospheric radio wave propagation characteristics, it is important to investigate the impact of solar activities. In this study, we focused on the MF band broadcasting waves having a feature of long-range propagation by ionospheric reflection. We observed the MF band waves at Kiruna, Sweden, located in the Arctic area. As a result, received levels of broadcasting waves were affected by ionospheric disturbances due to effects of solar activities such as flares with increasing south-direction IMF (Interplanetary Magnetic Field), in addition to ordinary daylights. Further it was observed that there were fluctuation shifts in the received levels due to different ionospheric reflection points in the latitude.