uu.seUppsala University Publications
Change search
ReferencesLink to record
Permanent link

Direct link
Occurrence and location of concentrated load and generator regions observed by Cluster in the plasma sheet
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
Show others and affiliations
2009 (English)In: Annales Geophysicae, ISSN 0992-7689, E-ISSN 1432-0576, Vol. 27, no 11, 4131-4146 p.Article in journal (Refereed) Published
Abstract [en]

Here, and in a companion paper by Hamrin et al. (2009) [Scale size and life time of energy conversion regions observed by Cluster in the plasma sheet], we investigate localized energy conversion regions (ECRs) in the Earth's plasma sheet. In total we have studied 151 ECRs within 660 h of plasma sheet data from the summer and fall of 2001 when Cluster was close to apogee at an altitude of about 15-20RE. Cluster offers appropriate conditions for the investigation of energy conversion by the evaluation of the power density, E.J, where E is the electric field and J the current density. From the sign of the power density, we have identified more than three times as many Concentrated Load Regions (CLRs) as Concentrated Generator Regions (CGRs). We also note that the CLRs appear to be stronger. To our knowledge, these are the first in situ observations confirming the general notion of the plasma sheet, on the average, behaving as a load. At the same time the plasma sheet appears to be highly structured, with energy conversion occurring in both directions between the fields and the particles. From our data we also find that the CLRs appear to be located closer to the neutral sheet, while CGRs prefer locations towards the plasma sheet boundary layer (PSBL). For both CLRs and CGRs, E and J in the GSM y (cross-tail) direction dominate the total power density, even though the z contribution occasionally can be significant. The prevalence of the y-direction seems to be weaker for the CGRs, possibly related to a higher fluctuation level near the PSBL.

Place, publisher, year, edition, pages
2009. Vol. 27, no 11, 4131-4146 p.
Keyword [en]
Magnetospheric physics, Auroral phenomena, Magnetosphere-ionosphere interactions, Plasma sheet
National Category
Physical Sciences
URN: urn:nbn:se:uu:diva-148218DOI: 10.5194/angeo-27-4131-2009ISI: 000272232100004OAI: oai:DiVA.org:uu-148218DiVA: diva2:401607
Available from: 2011-03-03 Created: 2011-03-03 Last updated: 2011-03-03Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text
By organisation
Swedish Institute of Space Physics, Uppsala Division
In the same journal
Annales Geophysicae
Physical Sciences

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 129 hits
ReferencesLink to record
Permanent link

Direct link