[1] The configuration of the magnetic field near 100 RJ in the dusk sector of the Jovian magnetosphere varies with distance from the equatorial current sheet. The changing twist out of meridian planes is consistent with flows that lag corotation near the equator but that may lead corotation at higher latitudes. Although a portion of the field perturbation may be produced by magnetopause current...

We present a comprehensive overview of the occurrence of discrete and diffuse aurora in the nightside Northern Hemisphere at invariant latitudes 55−75. Twenty-one months of Freja observations (1 January 1993 to 30 September 1994) from the Northern Hemisphere, obtained at ∼1700 km altitude, are included in this investigation. We investigate the importance of seasonal effects, solar illumination ...

Abstract—Local Area Augmentation System (LAAS) is expected to enable the pilots to guide the aircraft more precisely and safely into busy airports even in poor visibility conditions. The anomalous low and equatorial latitude Ionosphere is severe threat to the LAAS system. To characterize the anomalous ionospheric gradients, the performance of an ionospheric threat model is evaluated. In our inv...

A modeling method is proposed to derive a two-dimensional ionospheric layer conductivity, which is appropriate to obtain a realistic solution of the polar-originating ionospheric current system including equatorial enhancement. The model can be obtained by modifying the conventional, thin shell conductivity model. It is shown that the modi®cation for one of the non-diagonal terms (Shu) in the c...

The complex drivers of equatorial plasma bubbles and resulting scintillation requires a system science approach spanning the Magnetosphere-Ionosphere-Thermosphere-Mesosphere disciplines. current roadmap missions strongly support this approach, but gaps are identified in planned observations, with potential mission solutions proposed.

The disturbances and irregularities in the ionosphere are primarily recognized ramifications of space weather called scintillations. Irregularities electron densities source ionospheric This article investigates scintillations, which predominant trans-equatorial equatorial regions. Based on data from a multi-constellation Global Navigation Satellite Systems (GNSS) receiver at Chaitanya Bharathi...

Huancayo is the only equatorial electrojet station where the daytime increase of horizontal geomagnetic ®eld (H) is associated with a simultaneous increase of eastward geomagnetic ®eld (Y). It is shown that during the counter electrojet period when DH is negative, DY also becomes negative. Thus, the diurnal variation of DY at equatorial latitudes is suggested to be a constituent part of the equ...

Observations by the EISCAT Svalbard radar are presented that show the response of the spatial structure of the ionosphere in the dayside cusp region to a rotational trend in the IMF clock angle. Over a period of one hour, the clock angle increased from about 45 to some 150, moving the likely location of the magnetopause reconnection site from the high-latitude lobe to near the equatorial plane....

Vertical shear in the zonal plasma drift speed is apparent in incoherent and coherent scatter radar observations of the bottomside F region ionosphere made at Jicamarca from about 1600–2200 LT. The relative importance of the factors controlling the shear, which include competition between the E and F region dynamos as well as vertical currents driven in the E and F regions at the dip equator, i...