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Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, U.K
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- PublicationOpen AccessFurther tests of the IRI and DGR model ionospheres(1994-05)
; ; ; ; ; ;Kecic, K. J.; Geomagnetic Institute, Grocka, Belgrade, Yugoslavia ;Bradley, P. A.; Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, U.K. ;Cander, L. R.; Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, U.K. ;Dick, M. I.; Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, U.K. ;Zolesi, B.; Istituto Nazionale di Geofisica, Roma, ItalyIstituto Nazionale di Geofisica, Roma, Italy; ; ; ; The present study discusses and compares the IRI and DGR ionospheric models using N(h) profiles obtained during a high solar activity period at South Uist ionosonde station. After inversion, N(h) profiles obtained from ionograms at South Uist have been compared with those derived from the IRI-90 and DGR ionospheric models. A small data set has been selected such that both geomagnetically quiet and disturbed conditions are represented. The importance of further comparisons with additional sets of N(h) profiles under different solar-geophysical conditions and at more stations has been recognized.148 247 - PublicationOpen AccessThe ionospheric storm studies: further development of the mapping technique(1996-08)
; ; ; ; ; ;Kutiev, I.; Geophysical Institute, Bulgarian Academy of Sciences, Sofia, Bulgaria ;Samardjiev, T.; Geophysical Institute, Bulgarian Academy of Sciences, Sofia, Bulgaria ;Bradley, P. A.; Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, U.K ;Dick, M. I.; Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, U.K ;Cander, L. R.; Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, U.K; ; ; ; The technique of using instantaneous maps for ionospheric storm studies is further developed. Integral parameters are introduced characterizing the main features of each map. These parameters are the net volumes of Δf0F2, ΔM(3000)F2and their gradients. The magnetic storm 1-2 March, 1982 was considered and it was found that before the storm commencement and in recovery phase the Net Gradient (NG) is directed steadily to the East, while in the main phase it turns southward. NG shows where the changes of the F-layer come from. The net volume of Δf0F2 (NF) correlates well with Dst and AE indices.127 160