[P-EM27] Physics and Chemistry in the Atmosphere and Ionosphere

[PEM27-P26] Observation of GNSS scintillation in Tromso

*Kodai UWASHITOMI¹, Yuichi OTSUKA¹, Yasunobu OGAWA², Keisuke HOSOKAWA³ (1.Solar-Terrestrial Environment Laboratory, Nagoya University, 2.National Institute of Polar Research, 3.Department of Communication Engineering and Informatics, University of Electro-Communications)

Keywords:scintillation, ionosphere, GPS, GNSS, geomagnetic disturbance, TEC

Ionospheric scintillation is a phenomenon that received radio wave fluctuates in phase and amplitude. It has been known that amplitude scintillation frequently occurs at equatorial regions, and that phase scintillation frequently occurs at high latitudes. We have been operating dual-frequency GNSS (Global Navigation Satellite System) receivers at Tromsoe, Norway. The receivers are controlled by PC and record carrier phase and signal-to-noise ratio of the received signal from GPS satellites. We have calculated S4 and σφ indices. S4 is defined as a ratio of standard deviation of the signal intensity to the average signal intensity in each 1 minute. σφis defined as the standard deviation of the phase of the received signal. During November and December 2013, in 12 days, we observed amplitude scintillation events in which S4 exceeds 0.3.In 7 days out of 5 days, magnetic activity was high. In this study, we will compare the amplitude scintillation with phase scintillation and total electron content (TEC) obtained from the GNSS receivers to discuss generation mechanisms of ionospheric irregularities causing the amplitude scintillations.