Study of X-Ray Flare in Relation to Corresponding Sudden Phase Anomaly

Abstract

In this paper an exhaustive study of X-ray flare which occurred on 13 April 1966 between 0706 and 0716 UT has been made in relation to the corresponding phase changes observed on three transmission circuits recorded at Inubo (Japan) on NPG (18·6 kc/s), NSS (21·4 kc/s) and GBZ (19·6 kc/s). From these studies the value of N_r/N₀ comes to 0·75 where N_r is the electron density at the height of reflection and N₀ is the maximum electron density. The height of maximum electron production has been found to be 65 km and the height of reflection at the subsolar point as 58·5 km.

Assuming the Chapman layer produced below the D-layer (Chilton et al., 1963), the value of X-ray wavelength responsible for this SPA has been found to be 1·8 A and corresponding flux energy as 1·02 × 10⁻⁴ erg cm⁻² sec⁻¹.

The observed value of flux energy as found at the maximum of X-ray flare on 13 April 1966 comes to 2·1 × 10⁻⁴ erg cm⁻² sec⁻¹ which is in good agreement with the value calculated from the analysis of corresponding SPA. These results show that X-ray flux intensities may be computed reasonably well from the ground based observations of SPA on different paths.