Characterization of lower ionosphere disturbance associated with classes of solar flare using VLF monitoring system / A. Taat ...[et al.]

The response of the D-region low-latitude
ionosphere has been studies for difference classes of Solar flares
on October 2013 using VLF Signal from Northwest Cape,
Australia (NWC, 19.8kHz) transmitter monitored at National
University of Malaysia (UKM, 2.550N, 101.460E). Attention is
restricted to diurnal variation and the solar x-ray effects on
propagation of VLF Signal. The changes and the enhancement of
amplitude signal (VLF) are related to the X-ray fluxes that
measured by GOES satellite. The two main parameters of lower
ionosphere which are reference height (H’) and sharpness factor
(β) was estimated by using the Long Wave Propagation
Capability (LWPC) Code. Statistical results show both
parameters is strongly depend on the flare classes and local time
of flare`s occurrence. This research are also presents the trend of
the amplitude perturbations correlated with the intensity of the
X-ray flux by difference classes of solar x-ray flares during
second peak of solar cycle 24.