Towards Forecasting of GPS Phase Scintillation in the High-Latitude Ionosphere

Details Towards Forecasting of GPS Phase Scintillation in the High-Latitude Ionosphere Towards Forecasting of GPS Phase Scintillation in the High-Latitude Ionosphere

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm31b2099p&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM31B-2099

Physics

[2102] Interplanetary Physics / Corotating Streams, [2439] Ionosphere / Ionospheric Irregularities, [2447] Ionosphere / Modeling And Forecasting, [6979] Radio Science / Space And Satellite Communication

Scientific paper

Interplanetary coronal mass ejections (ICMEs) and high-speed streams (HSSs) from coronal holes are major causes of ionospheric disturbances. The strongest of these solar wind events result in geomagnetic storms that can have a global impact on the ionosphere. At high latitudes, particularly in the ionospheric footprint of the cusp, even moderate HSSs or ICMEs impacting on the magnetosphere produce ionospheric irregularities that can cause significant GPS phase scintillation and cycle slips. The Canadian High Arctic Ionospheric Network (CHAIN) has been monitoring GPS ionospheric scintillation and total electron content (TEC) since 2008 during years of extended solar minimum. One-minute amplitude and phase scintillation indices from L1 GPS signals and TEC from L1 and L2 GPS signals are computed from amplitude and phase data sampled at 50 Hz. The amplitude scintillation S4 index has remained very low but moderate-to-strong phase scintillation events are often observed. The phase scintillation occurs predominantly on the dayside in the cusp and in the nightside auroral oval. Arrivals of HSSs typically result in phase scintillation in the cusp and, through increased substorm activity, in the auroral oval. Long lasting coronal holes cause recurrent geomagnetic and ionospheric disturbances that can be forecast one or several 27-day solar rotations ahead. Thus forecasting of phase scintillation due to HSSs should be possible. On the other hand, modeling of ICME evolution and propagation in the interplanetary space is needed for a successful forecast of scintillation caused by ICMEs. The phase scintillation due to ICMEs and HSSs is examined and the possibility of high-latitude scintillation forecasting is discussed.

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