October 5-9, 2014


P6.4 2-D visualization of global D-region and polar cap absorption

Ji-Hye Baek (Korea Astronomy and Space Science Institute)

Seonghwan Choi, Jaejin Lee, and Su-Chan Bong

We have visualized global D-region and polar cap absorption in two dimensions. We use the empirical relationship between solar x-ray flux (0.1-0.8 nm) and sub-solar point highest affected frequency to calculate global D-region. We also use the relation between the integral proton fluxes above certain energy thresholds and polar cap absorption. The calculation code was developed by C++ and refers to the result of Solar Position Algorithm (SPA) code of National Renewable Energy Laboratory (NREL) in C. We also consider the relation between the angles of the geomagnetic system and the geographical one. We calculate the attenuation at 8.83 MHz because it is used in High Frequency (HF) communications by airplanes. The code needs input data such as x-ray flux, proton flux, and Kp index of Geostationary Operational Environmental Satellite (GOES) and National Oceanic and Atmospheric Administration (NOAA). The attenuation is displayed in a world map, the Korean peninsula, and the Polar route.

Mode of presentation: poster

Applicable ADASS XXIV theme category: Visualisation for astronomy