Solar wind—magnetosphere–ionosphere coupling: an event study based on Freja data

Blomberg, Lars G.; Eriksson, S.; Cumnock, J. A.; Yamauchi, M.; Clemmons, J. H.; Marklund, Göran; Lindqvist, Per‐Arne; Karlsson, Tomas; Lundin, R.

doi:10.1016/j.jastp.2003.12.009

Cited by 3 publications

(3 citation statements)

References 18 publications

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“…These questionable parts should only have a minor impact on the final result and will not affect the general trend. For orbits that do not pass through the global maximum and minimum potential areas the potential contribution from the low‐latitude dynamo will be underestimated, as argued by Blomberg et al [2004]. The total low‐latitude contribution and the true cross‐polar potential could thus be slightly higher than measured here, but in general we expect them to be representative.…”

Section: Resultsmentioning

confidence: 49%

“… Newell et al [1991b] made a few observations of the LLBL potential that ranged between 3 and 15 kV, with the average around 5 kV. In a more recent study, Blomberg et al [2004] presented observational evidence that the low‐latitude dynamo could sometimes generate as much as a third of the potential for southward IMF conditions. In this paper we present the first statistical study of the sources that contribute to the cross polar potential, as all previous estimates have either been analytical or based on a limited set of observations.…”

Section: Introductionmentioning

confidence: 99%

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Statistical analysis of the sources of the cross‐polar potential for southward IMF, based on particle precipitation characteristics

Sundberg

Blomberg

Cumnock

2008

Geophysical Research Letters

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[1] There are several proposed physical processes which may contribute to the cross-polar potential and thus drive ionospheric convection around the polar caps. It is generally believed that magnetic reconnection is the dominant process, however dynamos such as viscous interaction and impulsive penetration are other possible contributors. A comprehensive statistical study has been conducted using data from the DMSP F13 satellite for passages along the northern hemisphere dawn-dusk meridian, with focus on typical two-cell convection patterns during times of steady southward IMF conditions. The results show that the lowlatitude dynamo (viscous interaction or reconnection in the LLBL) on average accounts for only 1 -2 kV of the total potential drop, values lower than those previously predicted. At rare occasions this dynamo can be a significant source of energy, however, contributing to more than 20 kV of the cross-polar potential. Citation: Sundberg, K. Å . T., L. G. Blomberg, and J. A. Cumnock (2008), Statistical analysis of the sources of the cross-polar potential for southward IMF, based on particle precipitation characteristics, Geophys. Res. Lett., 35, L08103,

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Section: Resultsmentioning

confidence: 49%

Section: Introductionmentioning

confidence: 99%

Statistical analysis of the sources of the cross‐polar potential for southward IMF, based on particle precipitation characteristics

Sundberg

Blomberg

Cumnock

2008

Geophysical Research Letters

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“…[12] Previous estimates of the boundary layer potential, based either on case studies or less extensive datasets [e.g., Sonnerup, 1980;Mozer, 1984;Newell et al, 1991;Lu et al, 1994], have in general derived values of the order of 5 -10 kV, with the exception of a study by Blomberg et al [2004] which indicated the existence of higher boundary layer potentials (the selected events were all from active times likely related to southward IMF). None of the studies above have treated IMF related effects to any large extent.…”

Section: Discussionmentioning

confidence: 99%

Properties of the boundary layer potential for northward interplanetary magnetic field

Sundberg

Blomberg

Cumnock

2009

Geophysical Research Letters

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We present a method for estimating the portion of the ionospheric high‐latitude potential that maps to the magnetospheric boundary layer during steady northward IMF and global ionospheric 4‐cell convection patterns associated with lobe reconnection, together with the results of a statistical study based on DMSP F13 data from 1996–2004. In comparison with a previous study for steady southward IMF by K. Å. T. Sundberg et al. (2008), the results show significantly larger boundary layer potentials, with a mean value of 10 kV for the 271 events studied, corresponding to roughly 30–35% of the potential generated by the solar wind interaction. In a statistical analysis, the boundary layer potential is also shown to depend significantly on viscous parameters such as the solar wind velocity, density and pressure.

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Investigating the viscous interaction and its role in generating the ionospheric potential during the Whole Heliosphere Interval

Bruntz

López

Bhattarai

et al. 2012

Journal of Atmospheric and Solar-Terrestrial Physics

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Solar wind—magnetosphere–ionosphere coupling: an event study based on Freja data

Cited by 3 publications

References 18 publications

Statistical analysis of the sources of the cross‐polar potential for southward IMF, based on particle precipitation characteristics

Statistical analysis of the sources of the cross‐polar potential for southward IMF, based on particle precipitation characteristics

Properties of the boundary layer potential for northward interplanetary magnetic field

Investigating the viscous interaction and its role in generating the ionospheric potential during the Whole Heliosphere Interval

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