Footprints of lobe reconnection observed in ionospheric electron density under steady northward IMF

Pryse, S. E.; Smith, A. M.; Moen, J.; Lorentzen, D. A.

doi:10.1029/1998gl900242

Cited by 6 publications

(7 citation statements)

References 12 publications

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“…There is a coexistence of type 1 and type 2 auroral forms for clock angles between 45°and 90°. Footprint signatures of reconnection processes in the spatial distribution of the ionospheric plasma density were reported by Walker et al (1998) and Pryse et al (1999) for Bz negative and positive respectively. The former study identi®ed a density enhancement co-located with type 1 aurora, with a steep density gradient on its equatorward side.…”

Section: Introductionmentioning

confidence: 99%

Multi-instrument study of footprints of magnetopause reconnection in the summer ionosphere

et al. 2000

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Abstract. Results are presented from a multi-instrument investigation of the signatures of equatorial reconnection in the summer, sunlit ionosphere. Well-established ion dispersion signatures measured during three DMSP satellite passes were used to identify footprints in ionospheric observations made by radio tomography, and both the EISCAT ESR and mainland radars. Under the prevalent conditions of southward IMF with the Bz component increasing in magnitude, the reconnection footprint was seen to move equatorward through the ESR ®eld-of-view. The most striking signature was in the electron temperatures of the F2 region measured by the EISCAT mainland radar that revealed signi®cantly enhanced temperatures with a steep equatorward edge, in general agreement with the leading edge of the ion dispersion. It is suggested that this sharp transition in the electron temperature may be an indicator of the boundary, mapping from the reconnection site, between closed geomagnetic ®eld lines and those opened along which magnetosheath ions precipitate.

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Section: Introductionmentioning

confidence: 99%

Multi-instrument study of footprints of magnetopause reconnection in the summer ionosphere

et al. 2000

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“…It is clear that tomographic imaging opens up the possibility of identifying characteristic features in the plasma distribution, like the depleted troughs, enhanced blobs and ionization tongues, of the complex structures that form the polar ionosphere. Boundaries between different plasma regimes in flux tubes linked to vastly separate regions of space can be identified in tomographic images [e.g., Walker et al , 1998; Pryse et al , 1999] so that use of observations from several chains of stations opens up the possibility of relating boundaries seen in the different geomagnetic sectors at the same time. A later study concerns the important topic of the structure of the polar ionosphere under northward IMF [ Middleton et al , 2005].…”

Section: Discussionmentioning

confidence: 99%

Radio tomographic imaging of the northern high‐latitude ionosphere on a wide geographic scale

et al. 2005

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[1] Several chains of receivers, measuring total electron content (TEC) during passes of satellites in the U.S. Navy Ionospheric Measuring System (NIMS), are operated at northern high latitudes by members of the International Ionospheric Tomography Community (IITC). Results are presented here of nearly simultaneous latitude-altitude images of the ionosphere over Scandinavia, Greenland, and Alaska, generated from IITC data obtained on 20 September 2001 and interpreted in the context of an IMF-dependent convection model. The images are compared with output from a coupled thermosphere-ionosphere-plasmasphere model and also with maps of high-latitude TEC generated from GPS measurements. With B z and B y both weakly negative, the images and map reveal plasma features of a two-cell convection pattern rotated slightly to earlier local magnetic times. The tomographic images provide details of map features such as a tongue of ionization created by solar EUV radiation on the dayside and entrained by convection into the polar cap from the western Russian sector. Combining latitude versus altitude tomographic images generated in different longitudinal sectors from polar-orbiting beacon satellites such as those of NIMS with TEC maps from GPS offers an emerging opportunity for polar aeronomic studies, especially if further related to synoptic convection measurements. The results also demonstrate the potential role of wide-scale radio tomography in the verification of ionospheric models.Citation: Kersley, L., S. E. Pryse, M. H. Denton, G. Bust, E. Fremouw, J. Secan, N. Jakowski, and G. J. Bailey (2005), Radio tomographic imaging of the northern high-latitude ionosphere on a wide geographic scale, Radio Sci., 40, RS5003,

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“…Several papers have addressed such issues, including two that illustrate the signatures in the dayside cusp ionosphere of the reconnection processes that link the Interplanetary Magnetic Field (IMF) carried by the solar wind to the geomagnetic field. Walker et al (1998) used radio tomography to image features resulting from reconnection near the equatorial plane when the IMF was southwards, while Pryse et al (1999) discussed structures linked to lobe reconnection under northwards IMF.…”

Section: Tomography and Space Weathermentioning

confidence: 99%

Total electron content - A key parameterin propagation: measurement and usein ionospheric imaging

Kersley

Malan

Pryse

et al. 2009

Annals of Geophysics

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The paper reports on a series of studies carried out within the COST 271 Action relating to the measurement and use of Total Electron Content (TEC) of the ionosphere over North West Europe. Total electron content is a very important parameter for the correction of propagation effects on applied radio systems so that it is vital to have confidence in the experimental measurements and the resultant products derived as aids for the practical user. Comparative investigations have been carried out using TEC values from several different sources. It was found that in general there was broad statistical agreement between the data sets within the known limitations of the techniques, though discrepancies were identified linked to steep ionospheric gradients at the onset of geomagnetic storm disturbance and in the vicinity of the main trough. The paper also reviews recent progress in the development of tomographic inversion techniques that use total electron content measurements to image the ionosphere as an aid to various radio systems applications.

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Footprints of lobe reconnection observed in ionospheric electron density under steady northward IMF

Cited by 6 publications

References 12 publications

Multi-instrument study of footprints of magnetopause reconnection in the summer ionosphere

Multi-instrument study of footprints of magnetopause reconnection in the summer ionosphere

Radio tomographic imaging of the northern high‐latitude ionosphere on a wide geographic scale

Total electron content - A key parameterin propagation: measurement and usein ionospheric imaging

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