[PDF] Top 20 ANGEO - The spatial structure of the dayside ionospheric trough

... the trough minimum, obtained from data binned into hourly intervals of Universal ...each trough position, calculated if there were ®ve or more passes in a bin, is shown by the arrows through the ...no ... See full document

... of ionospheric probing by signals from fast-moving satellites on almost polar orbits carrying di€erential Doppler ...of spatial scales ranging from hundreds of meters to tens of kilometers can be ... See full document

... Small-scale spatial structure in optical aurora that has been observed for decades has recently been comple- mented by in situ measurements on satellites of energetic particle ¯uxes, electric ®elds and ... See full document

... of spatial scans from each of the three radars is illustrated, in magnetic latitude and MLT coordinates; in each case the spatial plots are separated by between 2 and 6 min, and the duration of each time ... See full document

... can be seen in Fig. 3, where the electron density is plotted as a function of latitude for the scan of the radar commencing at 1836 UT. The four curves correspond to interpolations of the measurements at heights ranging ... See full document

... density trough at very high latitudes is suggested to mark a transition into the post-noon time ...horizontal structure, such as the last two images (Pryse et ... See full document

... density trough at very high latitudes is suggested to mark a transition into the post-noon time ...horizontal structure, such as the last two images (Pryse et ... See full document

... this structure is that during heating at a frequency very close to the peak plasma frequency the vertically propagating heater ray pene- trated the ionosphere, whilst rays propagating obliquely did ... See full document

... the ionospheric electron density to the aurora is seen in ...a dayside trough with a minimum about 77°N and a steep gradient to the north, leading to a structured F-layer enhancement between about ... See full document

... ¯uxes for several minutes. The coupling of the solar wind AlfveÂn waves during a period of B z < 0 could provide such a mechanism if the background antisun- ward convection becomes comparable to the drift speed of the ... See full document

... Navy Ionospheric Monitoring System (NIMS), previously known as the Navy Navigational Satellite System (NNSS), and enable the measurement of total electron content along a large number of intersecting ... See full document

... the dayside magneto- pause where the solar and geomagnetic ®elds are oppositely ...the ionospheric dayside merging regions in both hemispheres, showing their dependence on the Earth's dipole ... See full document

... Received: 20 September 1999 / Revised: 17 January 2000 / Accepted: 18 February 2000 Abstract. The response of the dayside ionosphere to changes in polarity of the interplanetary magnetic ®eld was observed by two ... See full document

... pulsed ionospheric ¯ows in the noon-sector high-latitude ...the ionospheric footprint of newly reconnected geomagnetic ®eld lines, which occur during episodes of magnetic ¯ux transfer to the terrestrial ... See full document

... >30 to >80 keV protons continues around noon forming the continuous oval-shaped region of isotropic precipitation. Part of this region lies on open ®eld lines in the region of cusp-like or mantle precipitation, its ... See full document

... Summary and conclusions We presented a pulsation event, observed by GOES-6 during dusk in spring, where the frequency suddenly changes. We propose that this occurs due to a variation of ionospheric conditions. The ... See full document

... the monthly means, together with CTIM predictions from the two simulations, in the same format as was shown for Rome. During the prolonged disturbance during the early part of the interval, the data shows a long-lived ... See full document

... Vanina, Speci®cation of the empirical model of the D-region electron concentration relation to the zenith angle according to rocket measurements, Geomagn. Avdeev,[r] ... See full document

... E-region structure in the tomographic recon- ...F-region structure, which combined with probable plasma drift may have created the broad (3° latitude) ... See full document

... Abstract. A comparative study of the geomagnetic and ionospheric data at equatorial and low-latitude stations in India over the 20 year period 1956±1975 is described. The reversal of the electric ®eld in the ... See full document