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Climatology of successive equatorial plasma bubbles observed by GPS roti over Malaysia

M. Buhari, Suhaila and Abdullah, Mardina and Yokoyama, Tatsuhiro and Otsuka, Yuichi and Nishioka, Michi and Bahari, Siti Aminah and Hasbi, Alina Marie and Tsugawa, Takuya (2017) Climatology of successive equatorial plasma bubbles observed by GPS roti over Malaysia. Journal of Geophysical Research: Space Physics, 122 (2). pp. 2174-2184. ISSN 2169-9380

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Official URL: http://dx.doi.org/10.1002/2016JA023202

Abstract

The occurrence rate of the equatorial plasma bubble (EPB) with season, solar activity, and geomagnetic conditions are investigated using long-term data sets of Malaysia Real-Time Kinematics Network (MyRTKnet) from 2008 to 2013. The rate of TEC (total electron content) change index (ROTI) in 5 min was derived from MyRTKnet data to detect the EPB with scale sizes around tens of kilometers. Then, the daily east-west cross sections of 2-D ROTI maps were used to examine the EPB features over 100°E–119°E longitudes. The EPBs tend to occur successively in one night along the observational coverage of MyRTKnet during equinoxes in high solar activity years. The perturbations in a form of wavelike structures along the observed longitudes might be responsible for the development of successive EPBs due to high growth rate of the Rayleigh-Taylor instability (RTI) process. On the contrary, the occurrence of successive EPBs is infrequent and the occurrence day of EPB remains active during equinoctial months in low solar activity years. The small growth rate of the RTI process during low solar activity years might require a strong seed perturbation to generate the EPB structure. The occurrence probability of the EPB was found to be similar during quiet and disturbed geomagnetic conditions. The results imply that the strong perturbations play an important role in the development of the EPB in low solar activity years. Nonetheless, the high growth rate of the RTI could cause the successive occurrence of the EPB in high solar activity years.

Item Type:Article
Additional Information:RADIS System Ref No:PB/2017/11338
Uncontrolled Keywords:ionospheric irregularities, plasma waves and instabilities
Subjects:Q Science
Divisions:Science
ID Code:66468
Deposited By: Fazli Masari
Deposited On:03 Oct 2017 16:30
Last Modified:03 Oct 2017 16:30

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