Zobrazeno 1 - 10
of 157
pro vyhledávání: '"Pornchai Supnithi"'
Autor:
Phongsachot Benchawattananon, Apirat Siritaratiwat, Pornchai Supnithi, Michi Nishioka, Septi Perwitasari, Puripong Suthisopapan, Anan Kruesubthaworn
Publikováno v:
Earth, Planets and Space, Vol 76, Iss 1, Pp 1-14 (2024)
Abstract An ionogram image serves as a valuable data for examining the ionospheric bottom side characteristics and variabilities. Spread-F is indicated or identified by plasma irregularity in the ionospheric region. Diffused echo in the ionogram imag
Externí odkaz:
https://doaj.org/article/b54a60d308f74ee794df9c757203f4d0
Autor:
Thananphat Thanakulketsarat, Pornchai Supnithi, Lin Min Min Myint, Kornyanat Hozumi, Michi Nishioka
Publikováno v:
Earth, Planets and Space, Vol 75, Iss 1, Pp 1-15 (2023)
Abstract Equatorial plasma bubble (EPB) is a phenomenon characterized by depletions in ionospheric plasma density being formed during post-sunset hours. The ionospheric irregularities can lead to disruptions in trans-ionospheric radio systems, naviga
Externí odkaz:
https://doaj.org/article/66e5c8d5dd73452fbd325b6a4e11e463
Autor:
Keisuke Hosokawa, Susumu Saito, Hiroyuki Nakata, Chien-Hung Lin, Jia-Ting Lin, Pornchai Supnithi, Ichiro Tomizawa, Jun Sakai, Toru Takahashi, Takuya Tsugawa, Michi Nishioka, Mamoru Ishii
Publikováno v:
Earth, Planets and Space, Vol 75, Iss 1, Pp 1-15 (2023)
Abstract It has long been known that field-aligned irregularities within equatorial plasma bubbles (EPBs) can cause long-range propagation of radio waves in the VHF frequencies such as those used for TV broadcasting through the so-called forward scat
Externí odkaz:
https://doaj.org/article/ca1eb1e6096a4a52a3dbfcd66230f3f7
Autor:
Khanitin Seechai, Lin Min Min Myint, Kornyanat Hozumi, Michi Nishioka, Susumu Saito, Mamoru Yamamoto, Pornchai Supnithi
Publikováno v:
Earth, Planets and Space, Vol 75, Iss 1, Pp 1-11 (2023)
Abstract This study estimates the scale sizes of the plasma density irregularities and the longitudinal width associated with equatorial plasma bubbles (EPBs) in equatorial and low-latitude regions. By analyzing amplitude scintillation S4 indices and
Externí odkaz:
https://doaj.org/article/999d728b0b8e40038f1c92dd2ba2ce2f
Autor:
Phimmasone Thammavongsy, Pornchai Supnithi, Lin Min Min Myint, Kornyanat Hozumi, Donekeo Lakanchanh
Publikováno v:
Earth, Planets and Space, Vol 75, Iss 1, Pp 1-16 (2023)
Abstract The predictability of the nighttime equatorial spread-F (ESF) occurrences is essential to the ionospheric disturbance warning system. In this work, we propose ESF forecasting models using two deep learning techniques: artificial neural netwo
Externí odkaz:
https://doaj.org/article/52cde731aa3b4251a0c835d573657ef3
Publikováno v:
IET Communications, Vol 16, Iss 17, Pp 2019-2035 (2022)
Abstract Spatially coupled low‐density parity‐check (SC‐LDPC) codes generally use a window decoding scheme, which is known to yield a near‐optimal decoding, compared to full block decoding. Recently, a non‐uniform schedule has been proposed
Externí odkaz:
https://doaj.org/article/e846cf059e564596a75c40625e87ba7e
Publikováno v:
IEEE Access, Vol 10, Pp 103485-103495 (2022)
Nonuniform ionospheric delay is a well-known cause of degradations in radio wave propagations such as in satellite communication and positioning. In general, the ionospheric delay can be estimated using the Global Navigation Satellite System (GNSS) d
Externí odkaz:
https://doaj.org/article/a0a520c91c674e65bffaf1e175a7c30b
Autor:
Takashi Maruyama, Kornyanat Hozumi, Guanyi Ma, Pornchai Supnithi, Napat Tongkasem, Qingtao Wan
Publikováno v:
Earth, Planets and Space, Vol 73, Iss 1, Pp 1-21 (2021)
Abstract A new technique was developed to estimate the ionospheric total electron content (TEC) from Global Navigation Satellite System (GNSS) satellite signals. The vertically distributed electron density was parameterized by two thin-shell layers (
Externí odkaz:
https://doaj.org/article/03e8955b803946828022a739758ee1dd
Autor:
Takashi Kikuchi, Jaroslav Chum, Ichiro Tomizawa, Kumiko K. Hashimoto, Keisuke Hosokawa, Yusuke Ebihara, Kornyanat Hozumi, Pornchai Supnithi
Publikováno v:
Earth, Planets and Space, Vol 73, Iss 1, Pp 1-13 (2021)
Abstract Using the HF Doppler sounders at middle and low latitudes (Prague, Czech Republic; Tucuman, Argentina; Zhongli, Republic of China, and Sugadaira, Japan), we observed the electric fields of the geomagnetic sudden commencement (SC) propagating
Externí odkaz:
https://doaj.org/article/147587ea0e2c44b2b4e7ca804c6524fa
Publikováno v:
IEEE Access, Vol 8, Pp 201516-201526 (2020)
The irregularity of the local-area ionospheric delay is a primary impediment for Ground-Based Augmentation System (GBAS) services. Excessive ionospheric delay gradients may degrade aircraft positioning for high precision landing systems. Therefore, t
Externí odkaz:
https://doaj.org/article/36ffe7e32eb349fa9035cdb27a28ebf5