This paper reports a modeling study of the modifications of the nighttime lower ionospheric conductivity by electrostatic fields produced by underlying thunderstorms. The model used combines Ohm’s law with a simplified lower ionospheric ion chemistry model to self-consistently calculate the steady state nighttime conductivity above a thunderstorm. The results indicate that although the electron...

The daily variability of the ionosphere can greatly affect HF or SATCOM communications. HF skywave operators plan frequency schedules months in advance, however, they also require daily knowledge of the ionospheric conditions in order to modify assignments. SATCOM operators also require daily information about the levels of scintillation, which are variations in phase, amplitude, polarisation a...

8 Long-term variability has previously been observed in the relative magnitude of annual and 9 semi-annual variations in the critical frequency (related to the peak electron concentration) of 10 the ionospheric F2 layer (foF2). In this paper we investigate the global patterns in such 11 variability by calculating the time varying power ratio of semi-annual to annual components 12 seen in ionosp...

[1] Three-dimensional multifluid simulations of the solar wind interaction with a magnetized Mars are used to determine both the effect of the crustal magnetic field on ionospheric loss rate and the ionospheric loss rate as a function of solar wind conditions. Ionospheric losses on the order of 10 O2 + ions per second are found for quiet solar wind conditions. This is of the same order as that ...

[1] Empirical evidence of the preearthquake ionospheric anomalies (PEIAs) is reported by statistically investigating the relationship between variations of the plasma frequency at the ionospheric F2 peak foF2 and 184 earthquakes with magnitude M 5.0 during 1994– 1999 in the Taiwan area. The PEIA, defined as the abnormal decrease more than about 25% in the ionospheric foF2 during the afternoon p...

The operation of low frequency SAR sensors on space-borne platforms is perturbed by the presence of Earth’s ionosphere. The purpose of this paper is to outline an initial methodology exploiting the potential of Coherent Scatterers (CSs) for the estimation and correction of the different effects induced by ionospheric disturbances on SAR images. Based on the high spectral correlation and the poi...

Ionospheric disturbances caused by the 2016 West Sumatra earthquake have been studied using total electron content (TEC) measurements Global Navigation Satellite System (GNSS) observation stations evenly distributed in and Java, Indonesia. Previous focused on coseismic ionospheric (CID) detected 11–16 min after earthquake. The maximum TEC amplitude measured was 2.9 TECU (TEC Unit) with speed be...

The effects of the 31 March 2001 severe magnetic storm on the Southern Hemisphere ionosphere have been studied using ground-based and satellite measurements. The prime goal of this comprehensive study is to track the ionospheric response from high-to-low latitude to obtain a clear understanding of storm-time ionospheric change. The study uses a combination of ionospheric Total Electron Content ...