Detection of Spread-F, foF2 values and Planetary and Gravity Wave Signatures using Digisonde instruments and their comparison with COSMIC-I/FORMOSAT-3, SAMI and IRI data

Statistical studies of spread F for low, mid and high regions using digisonde data. Various algorithms have been written to process the raw data and determine spread F by using edge detection and pattern recognition techniques. Algorithms have also been written to find foF2 and hmF2 values for obtaining the density profile of the ionosphere. Findings based on work carried out to date include:
• Determination of seasonal and solar cycle variation patterns.
• Observation of particle precipitation at high latitudes using digisonde data.
• Correlation between digisonde, COSMIC-1/FORMOSAT-3 satellite data and SAMI and IRI models values to check for validity of data.
• Wave analysis has been performed to detect the presence of planetary and gravity wave patterns in foF2 values with periods ranging from a few hours to a few days and also for various seasons.