1Jet Propulsion Laboratory, California Institute of Technology, Pasadena CA, USA
2Air Force Research Laboratory, Kirtland, NM, USA
Received: 28 Oct 2013 – Revised: 22 Feb 2014 – Accepted: 25 Feb 2014 – Published: 28 Mar 2014
Abstract. This short paper presents phase and coherence data from the cross-wavelet transform applied on longitudinally separated very high frequency (VHF) equatorial ionospheric scintillation observations over Christmas Island. The phase and coherence analyses were employed on a pair of scintillation observations, namely, the east-looking and west-looking VHF scintillation monitors at Christmas Island. Our analysis includes 3 years of peak season scintillation data from 2008, 2009 (low solar activity), and 2011 (moderate solar activity). In statistically significant and high spectral coherence regions of the cross-wavelet transform, scintillation observations from the east-looking monitor lead those from the west-looking monitor by about 20 to 60 (40 ± 20) min (most frequent lead times). Using several years (seasons and solar cycle) of lead (or lag) and coherence information of the cross-wavelet transform, we envisage construction of a probability model for forecasting scintillation in the nighttime equatorial ionosphere.
Shume, E. B., Mannucci, A. J., and Caton, R.: Phase and coherence analysis of VHF scintillation over Christmas Island, Ann. Geophys., 32, 293-300, doi:10.5194/angeo-32-293-2014, 2014.