The performance of the global model of ionospheric slab
thickness (GMIST) in terms of F2 layer critical frequency (foF2) estimation is
evaluated during ionospheric disturbances caused by Hunga Tonga-Hunga Ha’apai
(HTHH) eruption on January 15, 2022. Hourly values of foF2 estimation using
GMIST with TEC input of global ionospheric map (GIM) are compared with foF2
observations from ionosonde stations. For this purpose, the correlation
coefficient and deviation are calculated at different locations of ionosonde
stations. The GMIST foF2 and ionosonde foF2 at the nearest HTHH have the
largest at about 5MHz and the longest deviation during about 14 hours. The
trend of the deviation decreases as the distance of ionosonde stations from
HTHH increases. The trend indicates the effect of HTHH eruption on the
ionosphere involves neutral wind that causes total electron content and foF2
are decrease in different levels. Meanwhile, the correlation coefficients
between GMIST foF2 and ionosonde foF2 are not influenced by HTHH eruption. The
results show that the HTHH eruption affects the GMIST foF2 performance,
especially near the epicenter. Overall the daily mean absolute deviations vary
from 0.3 MHz – 1.55 MHz. Hence the GMIST model is feasible to be used for HF
communication prediction, especially during quiet ionospheric conditions, and
necessary to be updated using real time ionosonde observation, especially after
extreme vulcano eruption.
Author(s) Details:
Buldan Muslim
Geospatial Research Center of National Research and Innovation Agency
(BRIN), Indonesia.
Prof. Mukhamad Nur
Cahyadi, S.T., M.Sc., PhD
Sepuluh Nopember Institute of Technology, Surabaya, Indonesia.
Haris Haralambous
Frederick University, Cyprus.
Christina Oikonomou
Frederick University, Cyprus.
Please see the book here:
https://doi.org/10.9734/bpi/eieges/v6/7256C
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