polar, cluster and superdarn evidence for high-latitude merging during southward imf: temporal/spatial evolution

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ID: 243647
2003
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Abstract
Magnetic merging on the dayside magnetopause often occurs at high latitudes. Polar measured fluxes of accelerated ions and wave Poynting vectors while skimming the subsolar magnetopause. The measurements indicate that their source was located to the north of the spacecraft, well removed from expected component merging sites. This represents the first use of wave Poynting flux as a merging discriminator at the magnetopause. We argue that wave Poynting vectors, like accelerated particle fluxes and the Walén tests, are necessary, but not sufficient, conditions for identifying merging events. The Polar data are complemented with nearly simultaneous measurements from Cluster in the northern cusp, with correlated observations from the Super-DARN radar, to show that the locations and rates of merging vary. Magnetohydrodynamic (MHD) simulations are used to place the measurements into a global context. The MHD simulations confirm the existence of a high-latitude merging site and suggest that Polar and SuperDARN observed effects are attributable to both exhaust regions of a temporally varying X-line. A survey of 13 merging events places the location at high latitudes whenever the interplanetary magnetic field (IMF) clock angle is less than ~150°. While inferred high-latitude merging sites favor the antiparallel merging hypothesis, our data alone cannot exclude the possible existence of a guide field. Merging can even move away from equatorial latitudes when the IMF has a strong southward component. MHD simulations suggest that this happens when the dipole ilt angle increases or when IMF BX increases the effective dipole tilt.

Key words. Magnetospheric physics (magnetopause, cusp and boundary layers; magnetospheric configuration and dynamics; solar wind-magnetosphere interactions)
Reference Key
maynard2003annalespolar, Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;N. C. Maynard;D. M. Ober;W. J. Burke;J. D. Scudder;M. Lester;M. Dunlop;J. A. Wild;A. Grocott;C. J. Farrugia;E. J. Lund;C. T. Russell;D. R. Weimer;K. D. Siebert;A. Balogh;M. Andre;H. Rème
Journal journal of food measurement and characterization
Year 2003
DOI
10.5194/angeo-21-2233-2003
URL
https://www.ann-geophys.net/21/2233/2003/angeo-21-2233-2003.pdf
Keywords
cosmic physics sciencephysicsgeophysics

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