TY - JOUR
T1 - Model simulation of the equatorial electrojet in the Peruvian and Philippine sectors
AU - Fang, T. W.
AU - Richmond, A. D.
AU - Liu, J. Y.
AU - Maute, A.
AU - Lin, C. H.
AU - Chen, C. H.
AU - Harper, B.
N1 - Funding Information:
T.W. Fang is supported by a NCAR/HAO Newkirk Graduate Research Fellowship. C.H Chen is supported by the project of the National Central University granted by National Science Council of Taiwan. B. Harper was supported by the UCAR Significant Opportunities in Atmospheric Research and Science program. This research was supported in part by CEDAR Grant 0535466 from the National Science Foundation. The authors are grateful for advice from Stan Solomon, Liying Qian, Ray Roble, and Wenbin Wang. The National Center for Atmospheric Research is sponsored by the National Science Foundation.
PY - 2008/12
Y1 - 2008/12
N2 - Between 100 and 120 km height at the Earth's magnetic equator, the equatorial electrojet (EEJ) flows as an enhanced eastward current in the daytime E region ionosphere, which can induce a magnetic perturbation on the ground. Calculating the difference between the horizontal components of magnetic perturbation (H) at magnetometers near the equator and about 6-9° away from the equator, ΔH, provides us with information about the strength of the EEJ. The NCAR Thermosphere-Ionosphere-Electrodynamics General Circulation Model (TIE-GCM) is capable of simulating the EEJ current and its magnetic perturbation on the ground. The simulated diurnal, seasonal (March equinox, June solstice, December solstice), and solar activity (F10.7=80, 140 and 200 units) variations of ΔH in the Peruvian (76°W) and Philippine (121°E) sectors, and the relation of ΔH to the ionospheric vertical drift velocity, are presented in this paper. Results show the diurnal, seasonal and solar activity variations are captured well by the model. Agreements between simulated and observed magnitudes of ΔH and its linear relationship to vertical drift are improved by modifying the standard daytime E region photoionization in the TIE-GCM in order to better simulate observed E region electron densities.
AB - Between 100 and 120 km height at the Earth's magnetic equator, the equatorial electrojet (EEJ) flows as an enhanced eastward current in the daytime E region ionosphere, which can induce a magnetic perturbation on the ground. Calculating the difference between the horizontal components of magnetic perturbation (H) at magnetometers near the equator and about 6-9° away from the equator, ΔH, provides us with information about the strength of the EEJ. The NCAR Thermosphere-Ionosphere-Electrodynamics General Circulation Model (TIE-GCM) is capable of simulating the EEJ current and its magnetic perturbation on the ground. The simulated diurnal, seasonal (March equinox, June solstice, December solstice), and solar activity (F10.7=80, 140 and 200 units) variations of ΔH in the Peruvian (76°W) and Philippine (121°E) sectors, and the relation of ΔH to the ionospheric vertical drift velocity, are presented in this paper. Results show the diurnal, seasonal and solar activity variations are captured well by the model. Agreements between simulated and observed magnitudes of ΔH and its linear relationship to vertical drift are improved by modifying the standard daytime E region photoionization in the TIE-GCM in order to better simulate observed E region electron densities.
KW - Equatorial electrojet
KW - Magnetic perturbations
KW - Seasonal and solar activity variation
KW - TIE-GCM
UR - http://www.scopus.com/inward/record.url?scp=56349140136&partnerID=8YFLogxK
U2 - 10.1016/j.jastp.2008.04.021
DO - 10.1016/j.jastp.2008.04.021
M3 - 期刊論文
AN - SCOPUS:56349140136
SN - 1364-6826
VL - 70
SP - 2203
EP - 2211
JO - Journal of Atmospheric and Solar-Terrestrial Physics
JF - Journal of Atmospheric and Solar-Terrestrial Physics
IS - 17
ER -