Open AccessCounter‐Electrojet Occurrence as Observed From C/NOFS Satellite and Ground‐Based Magnetometer Data Over the African and American Sectors
Author(s) -
Habarulema John Bosco,
Lefebvre Gabrielle,
Moldwin Mark B.,
KatamziJoseph Zama T,
Yizengaw Endawoke
Publication year - 2019
Publication title -
space weather
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.254
H-Index - 56
ISSN - 1542-7390
DOI - 10.1029/2019sw002236
Subject(s) - electrojet , magnetometer , equatorial electrojet , daytime , ionosphere , satellite , local time , geodesy , quiet , altitude (triangle) , space weather , physics , environmental science , geophysics , meteorology , atmospheric sciences , geology , magnetic field , earth's magnetic field , astronomy , mathematics , geometry , statistics , quantum mechanics
An analysis of the counter‐electrojet occurrence (CEJ) during 2008–2014 is presented for the African and American sectors based on local daytime (0700–1700 LT) observations from the Communications and Navigation Outage Forecasting System (C/NOFS) vertical ion plasma drift (equivalent to vertical E × B at an altitude of about 400 km) and ground‐based magnetometers. Using quiet time ( K p ≤ 3) data, differences and/or similarities between the two data sets with reference to local time and seasonal dependence are established. For the first time, it is shown that C/NOFS satellite data are consistent with magnetometer observations in identifying CEJ occurrences during all seasons. However, C/NOFS satellite data show higher CEJ occurrence rate for almost all seasons. With respect to local time, C/NOFS satellite observes more CEJ events than magnetometer observations by average of about 20% and 40% over the American and African sectors, respectively, despite both data sets showing similar trends in CEJ identification. Therefore, when a space weather event occurs, it is important to first establish the original variability nature and/or magnitude of the eastward electric field in equatorial regions before attributing the resulting changes to solar wind‐magnetosphere and ionosphere coupling processes since CEJ events can be present even during quiet conditions.