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Ground magnetic effects of the equatorial electrojet simulated by the TIE-GCM driven by TIMED satellite data

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Ground magnetic effects of the equatorial electrojet simulated by the TIE-GCM driven by TIMED satellite data. / Yamazaki, Yosuke; Richmond, A.D.; Maute, A.; Wu, Q.; Ortland, D.A.; Yoshikawa, A.; Adimula, I.A.; Rabiu, B.; Kunitake, M.; Tsugawa, T.

In: Journal of Geophysical Research: Space Physics, Vol. 119, No. 4, 04.2014, p. 3150-3161.

Research output: Contribution to journalJournal article

Harvard

Yamazaki, Y, Richmond, AD, Maute, A, Wu, Q, Ortland, DA, Yoshikawa, A, Adimula, IA, Rabiu, B, Kunitake, M & Tsugawa, T 2014, 'Ground magnetic effects of the equatorial electrojet simulated by the TIE-GCM driven by TIMED satellite data', Journal of Geophysical Research: Space Physics, vol. 119, no. 4, pp. 3150-3161. https://doi.org/10.1002/2013JA019487

APA

Yamazaki, Y., Richmond, A. D., Maute, A., Wu, Q., Ortland, D. A., Yoshikawa, A., Adimula, I. A., Rabiu, B., Kunitake, M., & Tsugawa, T. (2014). Ground magnetic effects of the equatorial electrojet simulated by the TIE-GCM driven by TIMED satellite data. Journal of Geophysical Research: Space Physics, 119(4), 3150-3161. https://doi.org/10.1002/2013JA019487

Vancouver

Yamazaki Y, Richmond AD, Maute A, Wu Q, Ortland DA, Yoshikawa A et al. Ground magnetic effects of the equatorial electrojet simulated by the TIE-GCM driven by TIMED satellite data. Journal of Geophysical Research: Space Physics. 2014 Apr;119(4):3150-3161. https://doi.org/10.1002/2013JA019487

Author

Yamazaki, Yosuke ; Richmond, A.D. ; Maute, A. ; Wu, Q. ; Ortland, D.A. ; Yoshikawa, A. ; Adimula, I.A. ; Rabiu, B. ; Kunitake, M. ; Tsugawa, T. / Ground magnetic effects of the equatorial electrojet simulated by the TIE-GCM driven by TIMED satellite data. In: Journal of Geophysical Research: Space Physics. 2014 ; Vol. 119, No. 4. pp. 3150-3161.

Bibtex

@article{bfb9af2f65cf433a8a920aa74765c15e,
title = "Ground magnetic effects of the equatorial electrojet simulated by the TIE-GCM driven by TIMED satellite data",
abstract = "Quiet-time daily variations of the geomagnetic field near the magnetic equator due to the equatorial electrojet are simulated using the National Center for Atmospheric Research (NCAR) Thermosphere-Ionosphere Electro- dynamics General Circulation Model (TIE-GCM), and compared to those observed by ground-based magnetometers. Simulations are run both with and without tidal forcing at the height of the model lower boundary (∼97 km). When the lower-boundary forcing is off, the wind that generates an electro- motive force in the model is primarily the vertically non-propagating diurnal tide, which is excited in the thermosphere due to daytime solar ultra-violet heating. The lower-boundary tidal forcing adds the effect of upward-propagating tides, which are excited in the lower atmosphere and propagate vertically to the thermosphere. The main objective of this study is to evaluate the relative importance of these thermospherically-generated tides and upward-propagating tides in the generation of the equatorial electrojet. Fairly good agreement is obtained between model and observations when the model is forced by realistic lower-boundary tides based on temperature and wind measurements from the Thermosphere-Ionosphere-Mesosphere Energetics and Dynamics (TIMED) satellite, as determined by Wu et al. [2012]. The simulation results show that the effect of upward-propagating tides increases the range of the geomagnetic daily variation in the magnetic-northward component at the magnetic equator approximately by 100%. It is also shown that the well-known semiannual change in the daily variation is mostly due to upward-propagating tides, especially the migrating semidiurnal tide. These results indicate that upward-propagating tides play a substantial role in producing the equatorial electrojet and its seasonal variability.",
keywords = "Equatorial electrojet, TIE-GCM , Upward-propagating tide , TIMED , Ground-based magnetometer , Semiannual variation",
author = "Yosuke Yamazaki and A.D. Richmond and A. Maute and Q. Wu and D.A. Ortland and A. Yoshikawa and I.A. Adimula and B. Rabiu and M. Kunitake and T. Tsugawa",
note = "{\textcopyright}2014. American Geophysical Union. All Rights Reserved.",
year = "2014",
month = apr
doi = "10.1002/2013JA019487",
language = "English",
volume = "119",
pages = "3150--3161",
journal = "Journal of Geophysical Research: Space Physics",
issn = "2169-9402",
publisher = "Blackwell Publishing Ltd",
number = "4",

}

RIS

TY - JOUR

T1 - Ground magnetic effects of the equatorial electrojet simulated by the TIE-GCM driven by TIMED satellite data

AU - Yamazaki, Yosuke

AU - Richmond, A.D.

AU - Maute, A.

AU - Wu, Q.

AU - Ortland, D.A.

AU - Yoshikawa, A.

AU - Adimula, I.A.

AU - Rabiu, B.

AU - Kunitake, M.

AU - Tsugawa, T.

N1 - ©2014. American Geophysical Union. All Rights Reserved.

PY - 2014/4

Y1 - 2014/4

N2 - Quiet-time daily variations of the geomagnetic field near the magnetic equator due to the equatorial electrojet are simulated using the National Center for Atmospheric Research (NCAR) Thermosphere-Ionosphere Electro- dynamics General Circulation Model (TIE-GCM), and compared to those observed by ground-based magnetometers. Simulations are run both with and without tidal forcing at the height of the model lower boundary (∼97 km). When the lower-boundary forcing is off, the wind that generates an electro- motive force in the model is primarily the vertically non-propagating diurnal tide, which is excited in the thermosphere due to daytime solar ultra-violet heating. The lower-boundary tidal forcing adds the effect of upward-propagating tides, which are excited in the lower atmosphere and propagate vertically to the thermosphere. The main objective of this study is to evaluate the relative importance of these thermospherically-generated tides and upward-propagating tides in the generation of the equatorial electrojet. Fairly good agreement is obtained between model and observations when the model is forced by realistic lower-boundary tides based on temperature and wind measurements from the Thermosphere-Ionosphere-Mesosphere Energetics and Dynamics (TIMED) satellite, as determined by Wu et al. [2012]. The simulation results show that the effect of upward-propagating tides increases the range of the geomagnetic daily variation in the magnetic-northward component at the magnetic equator approximately by 100%. It is also shown that the well-known semiannual change in the daily variation is mostly due to upward-propagating tides, especially the migrating semidiurnal tide. These results indicate that upward-propagating tides play a substantial role in producing the equatorial electrojet and its seasonal variability.

AB - Quiet-time daily variations of the geomagnetic field near the magnetic equator due to the equatorial electrojet are simulated using the National Center for Atmospheric Research (NCAR) Thermosphere-Ionosphere Electro- dynamics General Circulation Model (TIE-GCM), and compared to those observed by ground-based magnetometers. Simulations are run both with and without tidal forcing at the height of the model lower boundary (∼97 km). When the lower-boundary forcing is off, the wind that generates an electro- motive force in the model is primarily the vertically non-propagating diurnal tide, which is excited in the thermosphere due to daytime solar ultra-violet heating. The lower-boundary tidal forcing adds the effect of upward-propagating tides, which are excited in the lower atmosphere and propagate vertically to the thermosphere. The main objective of this study is to evaluate the relative importance of these thermospherically-generated tides and upward-propagating tides in the generation of the equatorial electrojet. Fairly good agreement is obtained between model and observations when the model is forced by realistic lower-boundary tides based on temperature and wind measurements from the Thermosphere-Ionosphere-Mesosphere Energetics and Dynamics (TIMED) satellite, as determined by Wu et al. [2012]. The simulation results show that the effect of upward-propagating tides increases the range of the geomagnetic daily variation in the magnetic-northward component at the magnetic equator approximately by 100%. It is also shown that the well-known semiannual change in the daily variation is mostly due to upward-propagating tides, especially the migrating semidiurnal tide. These results indicate that upward-propagating tides play a substantial role in producing the equatorial electrojet and its seasonal variability.

KW - Equatorial electrojet

KW - TIE-GCM

KW - Upward-propagating tide

KW - TIMED

KW - Ground-based magnetometer

KW - Semiannual variation

U2 - 10.1002/2013JA019487

DO - 10.1002/2013JA019487

M3 - Journal article

VL - 119

SP - 3150

EP - 3161

JO - Journal of Geophysical Research: Space Physics

JF - Journal of Geophysical Research: Space Physics

SN - 2169-9402

IS - 4

ER -