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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/14001
Title: Investigation of Spatiotemporal Morphology of Plasma Bubbles Based on EAR Observations
Authors: Joshi L.M.
Tsai L.-C.
Su S.-Y.
Otsuka Y.
Yokoyama T.
Yamamoto M.
Sarkhel S.
Hozumi K.
Lu C.-H.
Published in: Journal of Geophysical Research: Space Physics
Abstract: Spatiotemporal characteristics of equatorial plasma bubble (EPB) have been studied based on Equatorial Atmosphere Radar (EAR) fan sector observations from Kototabang. EPBs were characterized as either locally generated (whose genesis and subsequent evolution was observed in the fan sector maps) or drifted type (which drifted into fan sector scans from west). Investigation of the radar echo spectral width indicated that the drifted EPB could be less evolving type. Height of the F layer in the postsunset period over Kototabang and Chumphon were examined in the two types. Average peak h′F was higher in locally generated EPB cases than in drifted EPB cases (by ~25 km), which is also found to be statistically significant. This scenario has been visualized in terms of a standing large-scale wave structure (LSWS) whose phase determine whether EPB will be seen evolving over EAR or drifted from a western longitude. Furthermore, low-latitude sporadic E (Es) variabilities in the two cases were also examined. Es indicated an inverse relation with the peak h′F (which depends on crest/trough of LSWS). These results have been discussed in the light of earlier works on spatial morphology of EPB clusters, particularly in context to the possible generation mechanism of LSWS by the spatial inhomogeneity in the low-latitude E region conductivity. Lesser occurrence of low-latitude Es in locally generated EPB cases also signifies the vital role of E region conductivity on Rayleigh-Taylor instability. These results highlight a need for networked spatial observation of low-latitude Es. ©2019. American Geophysical Union. All Rights Reserved.
Citation: Journal of Geophysical Research: Space Physics (2019), 124(12): 10549-10563
URI: https://doi.org/10.1029/2019JA026839
http://repository.iitr.ac.in/handle/123456789/14001
Issue Date: 2019
Publisher: Blackwell Publishing Ltd
Keywords: E-F region coupling
equatorial plasma bubble
F region irregularities
large-scale wave structure
ISSN: 21699380
Author Scopus IDs: 38361851600
7203034098
25946409700
56414179400
57031177600
9274833100
22981859800
57193885530
53865228400
Author Affiliations: Joshi, L.M., Center for Space and Remote Sensing Research, National Central University, Chung-Li, Taiwan
Tsai, L.-C., Center for Space and Remote Sensing Research, National Central University, Chung-Li, Taiwan
Su, S.-Y., Center for Space and Remote Sensing Research, National Central University, Chung-Li, Taiwan
Otsuka, Y., Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, Japan
Yokoyama, T., Research Institute for Sustainable Humanosphere, Kyoto University, Kyoto, Japan
Yamamoto, M., Research Institute for Sustainable Humanosphere, Kyoto University, Kyoto, Japan
Sarkhel, S., Indian Institute of Technology Roorkee, Roorkee, India
Hozumi, K., National Institute of Information and Communications Technology, Tokyo, Japan
Lu, C.-H., Center for Space and Remote Sensing Research, National Central University, Chung-Li, Taiwan
Funding Details: The work was supported by grant MOST 106‐2111‐M‐008‐019 from the Ministry of Science and Technology, Taiwan, R.O.C. EAR data can be accessed through the data repository of Kyoto University, Japan. Kototabang and Chumphon ionogram data can be accessed through the data repository of National Institute of Information and Communications Technology (NICT), Japan. This work is also supported in part by the Ministry of Human Resource Development, Government of India.
Corresponding Author: Joshi, L.M.; Center for Space and Remote Sensing Research, National Central UniversityTaiwan; email: lmjoshinarl@gmail.com
Appears in Collections:Journal Publications [PH]

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