Low latitude ionosphere-thermosphere dynamics studies with inosonde chain in Southeast Asia
Takashi Maruyama,M. Kawamura,Shinji Saito,K. Nozaki,H. Kato,Narong Hemmakorn,T. Boonchuk,Tharadol Komolmis,C. Ha Duyen +8 more
TLDR
In this article, an ionosonde network consisting of a meridional chain and an equatorial pair was established in the Southeast Asian area, where three of four ionosondes are along the magnetic meridian of 100° E; two are close to the magnetic conjugate points in Northern Thailand and West Sumatra, Indonesia, and the other is near the magnetic equator in the Malay Peninsula, Thailand.Abstract:
. An ionosonde network consisting of a meridional chain and an equatorial pair was established in the Southeast Asian area. Three of four ionosondes are along the magnetic meridian of 100° E; two are close to the magnetic conjugate points in Northern Thailand and West Sumatra, Indonesia, and the other is near the magnetic equator in the Malay Peninsula, Thailand. The fourth ionosonde is also near the magnetic equator in Vietnam but separated by about 6.3° towards east from the meridional chain. For a preliminary data analysis, nighttime ionospheric height variations at the three stations of the meridional chain were examined. The results demonstrate that the coordination of the network has a great potential for studying ionosphere/thermosphere dynamics. Through the assistance of model calculations, thermospheric neutral winds were inferred and compared with the HWM93 empirical thermospheric wind model. Higher-order wind variations that are not represented in the empirical model were found.read more
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Conjugate Point Equatorial Experiment (COPEX) Campaign in Brazil: Electrodynamics highlights on spread F development conditions and day-to-day variability
M. A. Abdu,Inez S. Batista,Bodo W. Reinisch,J.R. de Souza,J. H. A. Sobral,Todd Pedersen,Amauri Fragoso de Medeiros,Nelson Jorge Schuch,E. R. de Paula,Keith M. Groves +9 more
TL;DR: In this article, the authors analyze the extensive Digisonde data from the COPEX stations, complemented by limited all-sky imager conjugate point observations, presenting a perspective on the ESF day-to-day and medium-term variabilities.
Journal ArticleDOI
First observations of large‐scale wave structure and equatorial spread F using CERTO radio beacon on the C/NOFS satellite
Smitha V. Thampi,Mamoru Yamamoto,Roland T. Tsunoda,Yuichi Otsuka,T. Tsugawa,Jyunpei Uemoto,Mamoru Ishii +6 more
TL;DR: In this paper, the first observations of large-scale wave structure (LSWS) and the subsequent development of equatorial spread F (ESF), using total electron content (TEC) derived from the ground based reception of beacon signals from the CERTO (Coherent Electromagnetic Radio Tomography) radio beacon on board C/NOFS (Communications/Navigation Outage Forecasting System) satellite, are presented.
First observations of large-scale wave structure and equatorial spread F using CERTO radio beacon on the C/NOFS satellite
Smitha V. Thampi,Mamoru Yamamoto,Roland T. Tsunoda,Yuichi Otsuka,T. Tsugawa,Jyunpei Uemoto,Mamoru Ishii +6 more
TL;DR: In this paper, the first observations of large-scale wave structure (LSWS) and the subsequent development of equatorial spread F (ESF), using total electron content (TEC) derived from the ground based reception of beacon signals from the CERTO (Coherent Electromagnetic Radio Tomography) radio beacon on board C/NOFS (Communications/Navigation Outage Forecasting System) satellite, are presented.
Journal ArticleDOI
Equatorial electrodynamics and neutral background in the Asian sector during the 2009 stratospheric sudden warming
Huixin Liu,Mamoru Yamamoto,S. Tulasi Ram,Takuya Tsugawa,Yuichi Otsuka,Claudia Stolle,Eelco Doornbos,Kiyohumi Yumoto,Tsutomu Nagatsuma +8 more
TL;DR: In this article, the ionospheric electrodynamics and neutral background in this longitude sector were investigated during the major stratospheric sudden warming (SSW) in January 2009.
Journal ArticleDOI
Equinoctial asymmetry of a low-latitude ionosphere-thermosphere system and equatorial irregularities: evidence for meridional wind control
TL;DR: In this article, the transequatorial meridional wind velocity reached approximately 10 and 40 m/s for the March and September equinoxes, respectively, respectively.
References
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Journal ArticleDOI
Revised global model of thermosphere winds using satellite and ground‐based observations
A. E. Hedin,Manfred A. Biondi,R. G. Burnside,G. Hernandez,Roberta M. Johnson,Timothy L. Killeen,C. Mazaudier,John W. Meriwether,Joseph E. Salah,Robert J. Sica,Roger W. Smith,Nelson W. Spencer,Vincent B Wickwar,T. S. Virdi +13 more
TL;DR: In this article, the authors combined ground-based incoherent scatter radar and Fabry-Perot optical interferometers to generate a revision (HWM90) of the HWM87 empirical model and extend its applicability to 100 km.
Journal ArticleDOI
The absorption and dissociative or ionizing effect of monochromatic radiation in an atmosphere on a rotating earth
TL;DR: In this article, the absorption of monochromatic radiation from the sun in an atmosphere of which the density varies exponentially with height is considered; the energy of the radiation, or a definite fraction of it, is supposed to dissociate or ionize the air, and the dissociation products are supposed to recombine with one another only, and not to diffuse away from the element in which they were formed.
Journal ArticleDOI
lonization transport effects in the equatorial F region
W. B. Hanson,R. J. Moffett +1 more
TL;DR: In this article, the continuity equation for electrons in F-2 layer obtained for region near geomagnetic equator at noon including photoionization, recombination, drift, etc.
Journal ArticleDOI
The prereversal enhancement of the zonal electric field in the equatorial ionosphere
TL;DR: In this paper, it was shown that after sunset, the ionospheric conductivity decreases far more rapidly in the E region than in the F region, and that the enhancement of the eastward field for an eastward F region wind turns out to be a simple direct consequence of the fact that the E and F conductivities are different.
Journal ArticleDOI
Gravity wave initiation of equatorial spread F: A case study
TL;DR: In this article, the authors show that although initiation by a gravity wave seems likely, the gravity wave interaction cannot yield the large displacements observed without further amplification by the Rayleigh-Taylor instability.