Advanced search
Start date
Betweenand
Related content
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

On the UT and seasonal variations of the standard and SuperMAG auroral electrojet indices

Full text
Author(s):
Singh, Anand K. [1] ; Rawat, R. [1] ; Pathan, B. M. [1]
Total Authors: 3
Affiliation:
[1] Indian Inst Geomagnetism, Navi Mumbai - India
Total Affiliations: 1
Document type: Journal article
Source: JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS; v. 118, n. 8, p. 5059-5067, AUG 2013.
Web of Science Citations: 11
Abstract

The standard auroral electrojet (AE) indices are based on magnetic disturbance data from 10 to 12 northern auroral observatories. Recently, Newell and Gjerloev (2011a) computed equivalent SuperMAG electrojet (SME) indices using data from around 100 mid latitude to high latitude observatories in the Northern Hemisphere. The SME indices certainly have advantage over the AE indices in terms of number as well as temporal resolution of substorm onsets due to better latitudinal and longitudinal coverage. The UT and seasonal variations of geomagnetic activity have been extensively examined in the past. However, particularly for the AE indices, these variations have remained elusive due to sparse distribution of the AE observatories. In this study, we examine what effect the inclusion of large number of stations would make on the UT and seasonal variations of the auroral electrojets activities. For this purpose, data for years 1997-2009 have been considered when consistently many stations (> 70) were available for the computation of the SME indices. We demonstrate that the SME indices exhibit grossly similar UT and seasonal variations as observed in the AE indices. However, there are subtle differences which arise due to difference in number of stations. Our study suggests that most of the UT and seasonal variations of the AE indices, reported earlier, were mainly not due the sparse distribution of stations, but rather to the actual physical processes that control them. (AU)

FAPESP's process: 12/12049-1 - Interplanetary causes and low-latitude geomagnetic response of intense geomagnetic storms in solar cycle 24
Grantee:Rashmi Rawat
Support Opportunities: Scholarships in Brazil - Post-Doctoral