Analysis of ionospheric electron parameters versus geomagnetic index Dst from RO data of FORMOSAT-3/COSMIC
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The FORMOSAT-3/COSMIC mission has provided ample ionospheric electron density profiles retrieved from the global positioning system radio occultation technique. Currently, there can be more than 2,000 electron density profiles acquired per day covering the global ionosphere from altitude 90 to 800 km. Utilizing the advantage of such a complete coverage, we statistically analyze how the ionospheric electron parameters NmF2, hmF2, and TEC respond to the geomagnetic index Dst for different magnetic latitudes and magnetic local time (MLT) and on quiet and storm times. A data set of 24 months is used for this study, in which most of the results focus on the low-latitude dayside regions. The results indicate that, in general, NmF2, hmF2, and TEC decrease as Dst increases at all seasons. Only during the sudden commencement phase (SSC) of storm events, NmF2 and TEC appear to increase as Dst increases.
KeywordsFORMOSAT-3 COSMIC NmF2 TEC Dst Storm
The authors would like to thank Yu-Jen Lee, Wei-Cheng Su, Jiun-Yeh Lai, Jia-Ting Lin,Chien Han Chen, Wen-Chi Cho, and Alfred B. C. Chen for assistance with data processing, and Dr. C. C. Hsiao, Dr. I. Zakharenkova for valuable discussions. Special thanks go to Frank C. Z. Cheng for his coordination that makes the collaboration between the authors possible. Research facilities are supported by PSSC/NCKU. The FORMOSAT-3/COSMIC data are provided by TACC and UCAR. This project is supported by grant No. 96-NSPO(B)-SP-FA07-03(C), 98-NSPO(B)-SP-FA07-03(C), GPSARC, and NSC 97-2111-M-006-002.
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