1990
DOI: 10.5636/jgg.42.683
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Polar cap and cusp boundaries at day and night.

Abstract: We discuss the practical ways to determine the polar cap boundary (PCB, i.e. the boundary between open and closed flux tubes) from observations available at low altitudes. A theory generally predicts a simple topology of PCB (one bundle of the open flux tubes in each polar cap) and the character of its shape and size dependence on IMF but the accurate predictions require to model self-consistently the processes both at the magnetopause and in the magnetotail. The practical ways of PCB indication based on trans… Show more

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Cited by 12 publications
(5 citation statements)
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References 31 publications
(28 reference statements)
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“…However, it is an indirect method which is highly dependent on the spatial distribution of stations used. Another more accurate but less routine method uses solar energetic particle events to identify the polar cap boundary [Sergeev, 1990]. These events are extremely rare (< 10 times per year) but can be used to calibrate other methods.…”
Section: Introductionmentioning
confidence: 99%
“…However, it is an indirect method which is highly dependent on the spatial distribution of stations used. Another more accurate but less routine method uses solar energetic particle events to identify the polar cap boundary [Sergeev, 1990]. These events are extremely rare (< 10 times per year) but can be used to calibrate other methods.…”
Section: Introductionmentioning
confidence: 99%
“…The cusp/cleft aurora is perhaps the most unambiguous ionospheric signature of the open/closed field line separatrix surface in the dayside magnetosphere [Sergeev, 1990 In this study we concentrate attention on two characteristic dynamical features of the cusp/cleft aurora and their relations to major changes in the IMF Bz component and solar wind dynamic pressure, respectively. One aspect of solar wind-magnetosphere coupling under investigation is the latitudinal movements and jumps of the persistent cusp/cleft aurora, i.e.…”
Section: Introductionmentioning
confidence: 99%
“…Polar Cap (PC): In the PC, the magnetic field lines are generally assumed to be open and connected to the solar wind, whereas the field lines outside the PC are closed (with the exception of the cusp) and map to the plasma sheet and the plasma sheet boundary layer in the magnetosphere. These two substantially different magnetic and plasma domains are separated by a polar cap boundary (e.g., Sergeev, 1990;Newell et al, 2009). Early spacecraft observations revealed a very simple precipitation pattern of solar energetic electrons in the PC: a plateau pattern with intense and nearly homogeneous flux with a sharp drop-off to lower latitudes (for high energies e.g.…”
Section: Introductionmentioning
confidence: 99%