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Modeling the behavior of ionosphere above Millstone Hill during the September 21-27,1998 storm

【摘要】:正A theoretical ionospheric model is employed to investigate the ionospheric behavior as observed by the incoherent-scatter radar(ISR) at Millstone Hill during the September 21-27,1998 storm.The observed N_mF_2 presented a significant negative phase on September 25,and a G condition(h_mF_2200 km) was also observed.The model results based on the standard input parameters(climatological model values) are in good agreement with the observed electron densities under quiet conditions, but there are large discrepancies duriug disturbed periods.The exospheric temperature T_(ex),neutral winds,atomic oxygen density[O]and molecular nitrogen density[N_2],and solar flux are inferred from the ISR ion temperature profiles and from the electron density profiles.Our calculated results show that the maximum T_(ex) is higher than 1700 K,and an averaged decrease in[O]is a factor of 2.2 and an increase in[N_2]at 300 km is about 1.8 times for the disturbed day,September 25,relative to the quiet day level.Therefore,the large change of[N_2]/[O]ratio gives a good explanation for the negative phase at Millstone Hill during this storm.Furthermore,at the disturbed nighttime the observations show a strong N_mF_2 decrease,accompanied by a significant h_mF_2 increase after the sudden storm commeucemeut(SSC).Simulations are carried out based on the inferred T_(ex).It is found that the uplift of F_2 layer during the period from sunset to post-midnight is mainly associated with the large equatorward winds,and a second rise in h_mF_2 after midnight results from the depleted N_e in the bottom-side of F_2 layer due to the increased recombination,while the"midnight collapse"of h_mF_2 is attributed to the large-scale traveling atmospheric disturbances.

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