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Observations of traveling ionospheric disturbances and 3-m scale irregularities in the nighttime F-region ionosphere with the MU radar and a GPS network
Earth, Planets and Space volume 54, pages 31–44 (2002)
The nighttime traveling ionospheric disturbances (TIDs) and the F -region 3-m scale field-aligned irregularities were simultaneously observed with the MU radar and GEONET, a GPS network, during the FRONT (F-region Radio and Optical measurement of the Nighttime TID) campaign periods in May 1998 and August 1999. The vertical profile of electron density detected by the incoherent scatter observation of the MU radar clarified that ionized atmosphere on the bottomside of the ionospheric F-region was deeply modulated by TIDs, which would cause the variations of the 630 nm band airglow luminosity. The coherent echoes from the 3-m scale field-aligned irregularities were detected also on the bottomside of the F-region in the nights when TIDs were intense in amplitude and the ionosphere was uplifted. Two-dimensional structures of the field-aligned irregularities detected by the multi-beam observation of the MU radar revealed that the 3-m scale irregularities formed band-like structures and traveled to the southwest in several nights. Their wave vector and traveling velocity were coincident with those of the nighttime TIDs that were simultaneously detected by the TEC observation of GEONET. The intense Doppler velocities of the coherent echoes indicate that the polarization electric field is generated inside the TIDs. We consider that the horizontal gradient of the electric conductivity associated by TIDs and the vertical gradient of the conductivity on the bottomside of the F-region ionosphere generates the 3-m scale irregularities through the gradient-drift instability process. The anti-correlation of the occurrence rate of the F-region field-aligned irregularities to the solar activity would be caused by the anti-correlation of the amplitude of TIDs and of the vertical gradient of the Pedersen conductivity.
Bowman, G. G., S. Fukao, M. Yamamoto, and K. Igarashi, MU-radar recorded field-aligned irregularities in the F2 region and associated sporadic E disturbances, J. Geomag. Geoelectr., 46, 873–889, 1994.
Francis, S. H., A theory of medium-scale traveling ionospheric disturbances, J. Geophys. Res., 79, 5245–5260, 1974.
Fukao, S., J. P. McClure, A. Ito, T. Sato, I. Kimura, T. Tsuda, and S. Kato, First VHF radar observation of midlatitude F-region Field-Aligned Irregularities, Geophys. Res. Lett., 15, 768–771, 1988.
Fukao, S., M. C. Kelley, T. Shirakawa, T. Takami, M. Yamamoto, T. Tsuda, and S. Kato, Turbulent upwelling of the mid-latitude ionosphere 1. observational results by the MU radar, J. Geophys. Res., 96, 3725–3746, 1991.
Fukao, S., M. Yamamoto, R. T. Tsunoda, H. Hayakawa, and T. Mukai, The SEEK (Sporadic-E Experiment over Kyushu) Campaign, Geophys. Res. Lett., 25, 1761–1764, 1998.
Garcia, F. J., M. C. Kelley, J. J. Makela, and C.-S. Huang, Airglow observations of mesoscale low-velocity traveling ionospheric disturbances at mid-latitudes, J. Geophys. Res., 105, 18,407–18,416, 2000.
Hines, C. O., Internal Atomspheric Gravity Waves at Ionospheric Heights, Canadian J. Phys., 38, 1441–1481, 1964.
Jacobson, A. R., R. C. Carlos, R. S. Massey, and G. Wu, Observations of traveling ionospheric disturbances with a satellite-beacon radio interferometer: Seasonal and local time behavior, J. Geophys. Res., 100, 1653–1665, 1995.
Kelley, M. C. and S. Fukao, Turbulent upwelling of the mid-latitude ionosphere, 2, Theoretical framework, J. Geophys. Res., 96, 3747–3753, 1991.
Kelley, M. C. and C. A. Miller, Electrodynamics of midlatitude spread F 3. Electrohydrodynamic waves? A new look at the role of electric field in thermospheric wave dynamics, J. Geophys. Res., 102, 11,539–11,547, 1997.
Kelley, M. C., J. J. Makela, A. Saito, N. Aponte, M. Sulzer, and S. A. Gonzalez, On the electrical structure of airglow depletion/height layer bands over Arecibo, Geophys. Res. Lett., 27, 2837–2840, 2000.
Kubota, M., K. Shiokawa, M. K. Ejiri, T. Ogawa, T. Sakanoi, H. Fukunishi, M. Yamamoto, S. Fukao, A. Saito, and S. Miyazaki, Tracking of wavelike structures in the OI 630-nm nightglow over Japan using an all-sky imagers network during FRONT campaign, Geophys. Res. Lett., 27, 4037–4040, 2000.
Maruyama, T., E×B Instability in the F region at low-to midlatitude, Planet. Space Sci., 38, 273–285, 1990.
Mendillo, M., J. Bauumgardner, D. Nottingham, J. Aarons, B. Reinisch, J. Scali, and M. C. Kelley, Investigations of thermospheric-ionospheric dynamics with 6300-Å images from the Arecibo observatory, J. Geophys. Res., 102, 7331–7343, 1997.
Miller, C. A., W. E. Swartz, M. C. Kelley, M. Mendillo, D. Nottingham, J. Scali, and B. Reinisch, Electrodynamics of midlatitude spread F 1. Observations of unstable, gravity wave-induced ionospheric electric fields at tropical latitudes, J. Geophys. Res., 102, 11,521–11,532, 1997.
Ogawa, T., N. Balan, Y. Otsuka, K. Shiokawa, C. Ihara, T. Shimomai, and A. Saito, Observations and modeling of 630 nm airglow and total electron content associated with traveling ionospheric disturbances over Shigaraki, Japan, Earth Planets Space, 54, this issue, 45–56, 2002.
Otsuka, Y., T. Ogawa, A. Saito, T. Tsugawa, S. Fukao, and S. Miyazaki, A new technique for mapping of total electron content using GPS network in Japan, Earth Planets Space, 54, this issue, 63–70, 2002.
Perkins, F., Spread F and ionospheric currents, J. Geophys. Res., 78, 218–226, 1973.
Saito, A., S. Fukao, and S. Miyazaki, High resolution mapping of TEC perturbations with the GSI GPS network over Japan, Geophys. Res. Lett., 25, 3079–3082, 1998.
Saito, A., M. Nishimura, M. Yamamoto, M. Kubota, K. Shiokawa, Y. Otsuka, T. Tsugawa, S. Fukao, T. Ogawa, M. Ishii, T. Sakanoi, and S. Miyazaki, Traveling ionospheric disturbances detected in the FRONT campaign, Geophys. Res. Lett., 28, 689–692, 2001.
Shiokawa, K., M. K. Ejiri, Y. Otsuka, T. Ogawa, M. Kubota, K. Igarashi, A. Saito, and T. Nakamura, Multi-point observation of short-period mesospheric gravity waves over Japan during the FRONT campaign, Geophys. Res. Lett.27, 4057–4060, 2000.
Shiokawa, K., Y. Otsuka, M. K. Ejiri, Y. Sahai, T. Kadota, C. Ihara, T. Ogawa, K. Igarashi, S. Miyazaki, and A. Saito, Imaging observations of the equatorward limit of mid-latitude traveling ionospheric disturbances, Earth Planets Space, 54, this issue, 57–62, 2002.
Swartz, W. E., M. C. Kelley, J. J. Makela, S. C. Collins, E. Kudeki, S. Franke, J. Urbina, N. Aponte, M. P. Sulzer, and S. A. Gonzalez, Coherent and incoherent scatter radar observations during intense mid-latitude spread F, Geophys. Res. Lett., 27, 2829–2832, 2000.
Taylor, M. J., J.-M. Jahn, S. Fukao, and A. Saito, Possible evidence of gravity wave coupling into the midlatitude F region ionosphere during the SEEK campaign, Geophys. Res. Lett., 25, 1801–1804, 1998.
WDC for geomagnetism, Kyoto, Ionospheric conductivity model, http://swdcdb.kugi.kyoto-u.ac.jp/sigcal/, 1999.
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Saito, A., Nishimura, M., Yamamoto, M. et al. Observations of traveling ionospheric disturbances and 3-m scale irregularities in the nighttime F-region ionosphere with the MU radar and a GPS network. Earth Planet Sp 54, 31–44 (2002). https://doi.org/10.1186/BF03352419
- Total Electron Content
- Ionospheric Disturbance
- Total Electron Content Variation
- Total Electron Content Data
- Electron Density Variation