Statistical Study of Equatorial Plasma Bubbles In Southeast Asia Using Ionosondes, GPS, and Equatorial Atmospere Radar

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Equatorial plasma bubbles (EPBs) are a phenomenon that refers to plasma depletion in the F-region in the equatorial and low-latitude ionosphere. Studies of EPBs have become important because the irregularities (plasma density fluctuations) embedded in EPBs could degrade the signal of a trans-ionospheric radio wave, such as causing scintillation on the GPS signal. The Rayleigh-Taylor instability (RTI) is considered a fundamental theory for EPB generation. However. several questions related ti the IL113 phenomenology arise. such as what are the factors that control the morphology of the EPB and cause multiple EPB generation? These questions are addressed in this thesis. This thesis consists of three studies that aim to investigate the generation and morphology of EPBs in Southeast Asia during the equinoctial months. We employed radio instrumentation to probe the ionosphere. Details of the instrumentation used in,,these studies are described as follows: (1) ionosondes were installed at Chumphon (CPN; 10.7°N, 99.4°E; magnetic latitude: 3.0°N) in Thailand and at Bac Lieu (BCL; 9.3°N, 105.7°E; magnetic latitude: 1-5°N) in Vietnam. (2) usound GPS receivers were deployed at Kototabang (KTB, 0.2°S. 100.3°E; magnetic latitude: I 0.4°S). Pontianak (PTK; 0.0°S, 109.3°E; magnetic latitude: 9.8°S), and Bandung (BDG; 6.9°S, 107.6°E; magnetic latitude: 16.7°S) in Indonesia, and (3) 47 MHz Equatorial Atmosphere Radar (EAR) was used at KTB. We also analyzed the zonal thermospheric wind data derived from in situ measurements of the accelerometers onboard the Challenging Minisatellite Payload (CHAMP) (orbit: meridional _direction, the altitude of —400 km) and the Gravity Field and Steady-State Ocean Circulation Explorer
(GOCE) satellites (orbit: sun-synchronous, meridional direction, the altitude -of —250 km). Our findings can be summarized as follows. EPBs frequently occur during both the March and September equinoxes. By analyzing the S4 index of the amplitude scintillation as observed by the ground GPS receivers at the
Informasi Detil
Judul Seri -
No. Panggil 42/2019/THE
Penerbit Nagoya University : Japan..,
Deskripsi Fisik Viii, 147 hlm.
Bahasa English
Klasifikasi NONE
Edisi 2018
Subyek Equatorial Plasma Bubbles
Pernyataan Tanggungjawab
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