Ionospheric slab thickness is defined as the ratio of TEC to maximum electron density of the F-region (NmF2), proportional to the square of the F2-layer critical frequency (foF2). It is an important parameter in that it is linearly correlated with scale height of the ionosphere, which is related to electron density profile. It also reflects variation of the neutral temperature. Therefore, ionos...

The seasonal effect on the F2 sublayer critical frequency of ionosphere (foF2), during one-day-shock, at Ouagadougou station three solar cycles (20, 21, and 22) is examined in this work. It appears that summer has an tending to decrease values ​​of foF2 maximum, ascending descending phase. At cycle winter autumn do not modify amplitudes. minimum, decreases ​​in morning (08:00 a.m. 1:00 ...

The changes in the ionosphere during geomagnetic disturbances is one of prominent Space Weather effects on near-Earth environment. character these can differ significantly at different regions Earth. We studied ionospheric response to five storms March 2012, using data Total Electron Content (TEC) and F2-layer critical frequency (foF2) along meridian 70° W Northern Hemisphere. There are few ion...

In this paper, a deep learning long-short-term memory (LSTM) method is applied to the forecasting of critical frequency ionosphere F2 layer (foF2). Hourly values foF2 from 10 ionospheric stations in China and Australia (based on availability) 2006 2019 are used for training verifying. While 2015 exclusive verifying accuracy. The inputs LSTM model sequential data previous values, which include l...

ionospheric slab thickness is defined as the ratio of tec to maximum electron density of the f-region (nmf2), proportional to the square of the f2-layer critical frequency (fof2). it is an important parameter in that it is linearly correlated with scale height of the ionosphere, which is related to electron density profile. it also reflects variation of the neutral temperature. therefore, ionos...

[1] A middleand low-latitude ionospheric theoretical model is used for the first time to assess the effects of the secular variations of geomagnetic field orientation on ionospheric long-term trends over the past century. It is found that the varied geomagnetic field can produce ionospheric long-term trends in both foF2 and hmF2. Since the amplitudes of geomagnetic field change depend on locati...

A detailed analysis of the responses of the equatorial ionosphere to a large number of severe magnetic storms shows the rapid and remarkable collapse of F-region ionisation during post-midnight hours; this is at variance with the presently accepted general behaviour of the low-latitude ionosphere during magnetic storms. This paper discusses such responses as seen in the ionosonde data at Kodaik...

This is anOp Abstract – A recently proposed self-consistent approach to the analysis of thermospheric and ionospheric long-term trends has been applied to Rome ionosonde summer noontime observations for the (1957–2015) period. This approach includes: (i) a method to extract ionospheric parameter long-term variations; (ii) a method to retrieve from observed foF1 neutral composition (O, O2, N2), ...