Possible relationship between the equatorial electrojet (EEJ) and daytime vertical E × B drift velocities in F region from ROCSAT observations

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• 作者：Sandeep Kumar^a ; B. Veenadhari^a ; ^{veenaiig@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; S. Tulasi Ram^a ; S.-Y. Su^b ; T. Kikuchi^c
• 关键词：Equatorial electrojet ; E  ; × ;   ; B drifts ; Zonal electric fields ; Equatorial ionization anomaly
• 刊名：Advances in Space Research
• 出版年：2016
• 出版时间：1 October 2016
• 年：2016
• 卷：58
• 期：7
• 页码：1168-1176
• 全文大小：1109 K

文摘

The vertical E × B drift is very important parameter as its day to day variability has great influence on the variability in the low latitude F-region ion and electron density distributions. The measurements of vertical ion velocity from the first Republic of China Satellite (ROCSAT-1) provide a unique data base for the development of possible relationship between vertical E × B drifts and ground based magnetometer observation. An attempt has been made to derive quantitative relationship between F-region vertical E × B drifts measured by ROCSAT-1 (600 km) and ground measured equatorial electrojet for the solar maximum period 2001–2003 for Indian and Japanese sectors. The results consistently indicate existence of linear relationship between the measured vertical E × B drifts at topside F-region and EEJ for both the sectors, with a moderate to high correlation coefficients. The linear relationship between ROCSAT-1 measured E × B drifts and EEJ for Indian and Japanese sectors has been compared with a similar relationship with Jicamarca Unattended Long-term Ionosphere Atmosphere Radar (JULIA) measured E × B drifts (150 km echos) and EEJ strength from Peruvian sector during 2003. It has been found that ROCSAT-1 measured E × B drifts shows linear relationship with EEJ, however, exhibits a larger scatter unlike JULIA radar observed E × B drifts. This may be attributed to the large height difference as ROCSAT-1 measures E × B drifts at 600 km altitude and the EEJ is E-region (110 km) phenomenon.