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Imaging observations of the equatorward limit of midlatitude traveling ionospheric disturbances
Earth, Planets and Space volume 54, pages 57–62 (2002)
This paper reports the first attempt to observe the equatorward limit of medium-scale traveling ionospheric disturbances (TIDs) in the middle latitudes. The TIDs usually propagate southwestward in the northern hemisphere. An all-sky cooled-CCD imager measured 630-nm airglow at a southern island of Japan, Okinawa (26.9°N, 128.3°E, geomagnetic latitude (MLAT) = 17.0°), during the FRONT-2 campaign of August 4–15, 1999. The TIDs were detected at the mainland of Japan (∼21°–36° MLAT) by the total electron content (TEC) observations of more than 1000 GPS receivers. In the August 4 event, the TIDs moving southwestward was seen only in the northern sky of Okinawa as a depletion band in the 630-nm airglow images. In the August 6 event, the TIDs were not seen in the 630-nm images at Okinawa, although weak TID activity was observed by the GPS network at the mainland of Japan. The TEC data also showed weakening of the TID activity below 18° MLAT. Based on these observations, we suggest that there is a possible limit of medium-scale TID propagation around ∼18° MLAT.
Francis, S. H., A theory of medium-scale traveling ionospheric disturbances, J. Geophys. Res., 79, 5245–5260, 1974.
Garcia, F. J., M. C. Kelley, J. J. Makela, and C.-S. Huang, Airglow observations of mesoscale low-velocity traveling ionospheric disturbances at midlatitudes, J. Geophys. Res., 105, 18,407–18,415, 2000.
Hamza, A. M., Perkins instability revisited, J. Geophys. Res., 104, 22,567–22,575, 1999.
Hanumath Sastri, J., K. B. Ramesh, and D. Karunakaran, On the nature of substorm-related transient electric field disturbances in the equatorial ionosphere, Planet. Space Sci., 40, 95–103, 1992.
Hines, C. O., Internal atmospheric gravity waves at ionospheric heights, Can. J. Phys., 38, 1441–1481, 1964.
Hooke, W. H., Ionospheric irregularities produced by internal atmospheric gravity waves, J. Atmos. Terr. Phys., 30, 795–823, 1968.
Kubota, M., K. Shiokawa, M. K. Ejiri, Y. Otsuka, T. Ogawa, T. Sakanoi, H. Fukunishi, M. Yamamoto, S. Fukao, and A. Saito, Traveling ionospheric disturbances observed in the OI 630-nm nightglow images over Japan by using a multi-point imager network during the FRONT campaign, Geophys. Res. Lett., 24, 4037–4040, 2000.
Mendillo, M., J. Baumgardner, D. Nottingham, J. Aarons, B. Reinisch, J. Scali, and M. Kelley, Investigations of thermospheric-ionospheric dynamics with 6300-A images from the Arecibo Observatory, J. Geophys. Res., 102, 7331–7343, 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.
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., Y. Katoh, M. Satoh, M. K. Ejiri, T. Ogawa, T. Nakamura, T. Tsuda, and R. H. Wiens, Development of optical mesosphere thermosphere imagers (OMTI), Earth Planets Space, 51, 887–896, 1999.
Shiokawa, K., Y. Katoh, M. Satoh, M. K. Ejiri, and T. Ogawa, Integrating-sphere calibration of all-sky cameras for nightglow measurements, Adv. Space Sci., 26, 1025–1028, 2000a.
Shiokawa, K., Y. Otsuka, T. Ogawa, K. Igarashi, S. Miyazaki, F. J. Rich, A. Saito, and K. Yumoto, Comprehensive imaging observations of midlatitude ionospheric disturbances during storm time substorms, J. Geophys. Res., 105, 27,067–27,080, 2000b.
Sobral, J. H. A., M. A. Abdu, W. D. González, B. T. Tsurutani, I. S. Batista, and A. L. Clua de González, Effects of intense storms and substorms on the equatorial ionosphere/thermosphere system in the American sector from ground-based and satellite data, J. Geophys. Res., 102, 14,305–14,313, 1997.
Taylor, M. J., J.-M. Jahn, S. Fukao, and A. Saito, Possible evidence of gravity wave coupling into the mid-latitude F region ionosphere during the SEEK campaign, Geophys. Res. Lett., 25, 1801–1804, 1998.
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Shiokawa, K., Otsuka, Y., Ejiri, M.K. et al. Imaging observations of the equatorward limit of midlatitude traveling ionospheric disturbances. Earth Planet Sp 54, 57–62 (2002). https://doi.org/10.1186/BF03352421
- Total Electron Content
- Ionospheric Disturbance
- Total Electron Content Variation
- Total Electron Content Data
- Virtual Height