World Library  


Add to Book Shelf
Flag as Inappropriate
Email this Book

Polar, Cluster and Superdarn Evidence for High-latitude Merging During Southward Imf: Temporal/Spatial Evolution : Volume 21, Issue 12 (30/11/-0001)

By Maynard, N. C.

Click here to view

Book Id: WPLBN0004001228
Format Type: PDF Article :
File Size: Pages 26
Reproduction Date: 2015

Title: Polar, Cluster and Superdarn Evidence for High-latitude Merging During Southward Imf: Temporal/Spatial Evolution : Volume 21, Issue 12 (30/11/-0001)  
Author: Maynard, N. C.
Volume: Vol. 21, Issue 12
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
-0001
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

APA MLA Chicago

Balogh, A., Dunlop, M., Scudder, J. D., Ober, D. M., Burke, W. J., Andre, M.,...Grocott, A. (-0001). Polar, Cluster and Superdarn Evidence for High-latitude Merging During Southward Imf: Temporal/Spatial Evolution : Volume 21, Issue 12 (30/11/-0001). Retrieved from http://members.worldlibrary.net/


Description
Description: Mission Research Corporation, Nashua, New Hampshire, USA. 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)


Summary
Polar, Cluster and SuperDARN evidence for high-latitude merging during southward IMF: temporal/spatial evolution

 

Click To View

Additional Books


  • Tropopause Fold Occurrence Rates Over th... (by )
  • Velocity of Auroral Arcs Drifting Equato... (by )
  • The Dependence of Plasma Density in the ... (by )
  • Sensitivity of African Easterly Waves to... (by )
  • Temporal Evolution of Two Auroral Arcs a... (by )
  • Electron Pitch-angle Diffusion: Resonant... (by )
  • Nonlinear Solar Cycle Forecasting: Theor... (by )
  • The Role of Atomic Oxygen Concentration ... (by )
  • Statistical Analysis of Ionospheric Pote... (by )
  • The Ionospheric Responses to the 11 Augu... (by )
  • Middle-energy Electron Anisotropies in t... (by )
Scroll Left
Scroll Right

 



Copyright © World Library Foundation. All rights reserved. eBooks from World Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.