Ionospheric Perturbation: A Review of Equatorial Plasma Bubble in the Ionosphere

Mokhtar, Mohd Rosmadi; Rahim, N A N Che; Ismail, M. Y.; Buhari, Suhaila M.

doi:10.1109/iconspace.2019.8905970

Cited by 6 publications

(6 citation statements)

References 39 publications

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“…where the amplitude scintillation recorded by the receiver has two parameters: total scintillation (S 4t ) and corrected scintillation (S 4cor ). The measured S 4t recorded by the receiver could be cluttered by the inherent effects of ambient noise and multipath effects [22]. To improve this, the GSV4004B receiver also calculates the correction of the total S 4t due to noise and multipath, which is then recorded as S 4cor .…”

Section: Instrumentation and Data Collectionmentioning

confidence: 99%

“…The TEC itself depends on the activity of the sunspot, seasonal, diurnal and spatial variations and the line of sight that includes knowledge of the satellite's elevation and azimuth [26]. The TEC may be calculated as [18], [22], [27]: The rate of change of the total electron content (ROT), calculated from the differential carrier phase, may provide information on large scale electron density irregularities. While the ROT can be deterred as the equation below [22]:…”

Section: Instrumentation and Data Collectionmentioning

confidence: 99%

“…The TEC may be calculated as [18], [22], [27]: The rate of change of the total electron content (ROT), calculated from the differential carrier phase, may provide information on large scale electron density irregularities. While the ROT can be deterred as the equation below [22]:…”

Section: Instrumentation and Data Collectionmentioning

confidence: 99%

“…The TEC fluctuations are commonly characterized by the ROTI parameter, defined as the standard deviation of the ROT rate, calculated for each 1-min or 5-min time interval [20], [22]. It shall be calculated as follows: = 〈 〉 − 〈 〉…”

Section: Instrumentation and Data Collectionmentioning

confidence: 99%

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L-Band Amplitude Scintillations During Solar Maximum at a Low Latitude Station

Rahim¹

2020

IJATCSE

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The Global Positioning System (GPS) is one of the most important and useful technologies developed for information and communication technology. Propagated wireless signals along the GPS link are affected by the ionospheric irregularities, therefore the GPS signals may experience ionospheric scintillation. In this study, GPS L-band amplitude scintillations observed at a low latitude station. Data from the Global Navigation Satellite System (GNSS) Ionospheric Scintillation and Total Electron Content (TEC) monitor (GISTM) receiver installed at the Space Science Centre (ANGKASA), Institute of Climate Change, UniversitiKebangsaan Malaysia, UKM (2.92°N, 101.78°E) were used for this study. Of the 460 scintillation (by neglecting S 4 <0.15) events recorded during February 2014, 55% were weak (0.15≤S 4 <0.25), 32% were moderate (0.25≤S 4 <0.35) and 13% were strong (S 4 ≥0.35). For February 2014, the amplitude scintillations were most pronounced in the post-sunset time to pre-midnight time. Finally, these analysed data are used to study the variability of scintillation with solar activities.

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Section: Instrumentation and Data Collectionmentioning

confidence: 99%

Section: Instrumentation and Data Collectionmentioning

confidence: 99%

Section: Instrumentation and Data Collectionmentioning

confidence: 99%

Section: Instrumentation and Data Collectionmentioning

confidence: 99%

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L-Band Amplitude Scintillations During Solar Maximum at a Low Latitude Station

Rahim¹

2020

IJATCSE

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“…Under SAA, the weakness of the magnetic field is unable to isolate the Earth's surface; therefore, the accumulating ionized particles will create discharges, plasma bubbles (most at nighttime), into the region, eventually releasing electromagnetic charges to Earth's surface [3,4]. Figure 3 shows the magnitude variation on the SAA, and other regions considered as having higher field intensity, and the values are also presented.…”

Section: Introductionmentioning

confidence: 99%

South Atlantic Anomaly, Ionospheric Signals from Seismic Events

Hagen¹,

Azevedo²

2020

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The purpose of this paper is to analyze the most significant events that occurred in the period 1996-2018 located under the South Atlantic Anomaly (SAA), where the earth's magnetic field is weaker and the trapped particles during the geomagnetic storms suffer decay over time. The time examined corresponds to the Solar Cycles 23 and 24; the area covered is defined by the following coordinates: 0N, −50S, 40E, −90W. Some significant events in this region reported Very Low Frequency (VLF) and Ultra Low Frequency (ULF) waves before the event, varying from minutes, hours, and even weeks before the earthquakes. Our study searches for a mechanism to explain why the crust creates electromagnetic signs detected at the ionosphere. Piezoelectric currents flow on the crust, combining with the magnetic field lines, temporarily producing pre-seismic electromagnetic pulses that are detected at the ionosphere prior to the events. The mechanism that allows electromagnetic signs to be detected at the ionosphere is also elucidated. These signs are brief, and they will cease with the beginning of the shock or shortly thereafter. However, some features contribute to making the signs impossible to detect, involving crust materials, location, magnitude, and depths. We suggest that these ionospheric events could happen for other kinds of hazard events, such as Volcanos.

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Active sensors for UAV autonomous navigation on Amazon region

Salles¹,

Velho

Shiguemori³

2022

2022 International Conference on Electrical, Computer, Communications and Mechatronics Engineering (ICECCME)

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This work is an additional exploration inspired by the results of an earlier study of the geo-localization problem over a densely forested region of the Brazilian Amazon forest. Light Detection and Ranging (LiDAR) data was post-processed from 3D cloud point format to 2D elevation images and template matching was used with normalized cross-correlation. Within a constrained search area it was possible to geo-localize the 2D patches of surface images on Interferometric Synthetic Aperture Radar (InSAR) elevation data. The transect 3D cloud point was transformed into a 12.5m resolution 2D surface image with the circular binning procedure, a resolution compatible with the Advanced Land Observation Satellite (ALOS) elevation maps used as reference. This application of template matching achieved 36m root mean square error, or about 4 pixels of error, over the LiDAR transect route. Position estimation is essential for autonomous navigation of aerial vehicles, and experiments with LiDAR data show potential for localization over densely forested regions, where Computer Vision methods using optical camera data may fail to acquire distinguishable features.

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Ionospheric Perturbation: A Review of Equatorial Plasma Bubble in the Ionosphere

Cited by 6 publications

References 39 publications

L-Band Amplitude Scintillations During Solar Maximum at a Low Latitude Station

L-Band Amplitude Scintillations During Solar Maximum at a Low Latitude Station

South Atlantic Anomaly, Ionospheric Signals from Seismic Events

Active sensors for UAV autonomous navigation on Amazon region

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