World Library  

Add to Book Shelf
Flag as Inappropriate
Email this Book

Superposed Epoch Analysis of Dense Plasma Access to Geosynchronous Orbit : Volume 23, Issue 7 (14/10/2005)

By Lavraud, B.

Click here to view

Book Id: WPLBN0003982913
Format Type: PDF Article :
File Size: Pages 11
Reproduction Date: 2015

Title: Superposed Epoch Analysis of Dense Plasma Access to Geosynchronous Orbit : Volume 23, Issue 7 (14/10/2005)  
Author: Lavraud, B.
Volume: Vol. 23, Issue 7
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


APA MLA Chicago

Denton, M. H., Borovsky, J. E., Thomsen, M. F., Lavraud, B., & W. Friede, R. H. (2005). Superposed Epoch Analysis of Dense Plasma Access to Geosynchronous Orbit : Volume 23, Issue 7 (14/10/2005). Retrieved from

Description: Space Science and Applications, Los Alamos National Laboratory, P.O. Box 1663, MS D466, Los Alamos, 87545 New Mexico, USA. We report on the occurrence of dense plasma access to geosynchronous orbit. We performed a superposed epoch analysis of 1464 events of dense (>2 cm–3 at onset) plasma observed by the MPA instruments on board the Los Alamos satellites, for the period 1990–2002. The results allow us to study the temporal evolution of various plasma parameters as a function of local time. We show that dense plasma access to geosynchronous orbit mostly occurs near local midnight. This dense plasma population is shown to be freshly injected from the mid-tail region, colder than the typical plasma sheet and composed of a relatively small O+ component. This population is thus probably the result of a cold, dense plasma sheet (CDPS) injection from the mid-tail region. Cold and dense ion populations are also observed on the dawnside of geosynchronous orbit at a similar epoch time. However, we demonstrate that this latter population is not the result of the dawnward transport of the population detected near midnight. The properties of this ion population may arise from the contribution of both ionospheric upflows and precipitating plasma sheet material. The correlation of an enhanced Kp index with the arrival of the CDPS at geosynchronous orbit shows that the inward transport of this population is allowed by an enhanced magnetospheric convection. Surprisingly, this dense plasma does not, in general, lead to a stronger Dst (ring current strength) within the 12 h following the CDPS injection. It is noted, however, that the superposed Kp index returns to relatively low values soon after the arrival of the CDPS. This may suggest that the dense plasma is, given the average of the 1464 events of this study, only transiting through geosynchronous orbit without accessing the inner regions and, therefore, does not contribute to the ring current.

Keywords. Magnetospheric physics (Plasma convection; Plasma sheet) – Space plasma physics (Transport processes)

Superposed epoch analysis of dense plasma access to geosynchronous orbit


Click To View

Additional Books

  • Polar Cap Patches Observed During the Ma... (by )
  • A New Approach to Momentum Flux Determin... (by )
  • The Effect of the High-speed Stream Foll... (by )
  • Observed and Predicted Characteristics o... (by )
  • Role of Mixed Precipitating Cloud System... (by )
  • Interdependence of Tropical Cirrus Prope... (by )
  • Long-term Wave Growth and Its Linear and... (by )
  • Magnetopause Energy and Mass Transfer: R... (by )
  • Ionosphere Dynamics Over the Southern He... (by )
  • Specification of Multiple Geomagnetic Re... (by )
  • Magnetic Field Configuration and Field-a... (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.