A5002770847- Geophysics and Gravity Measurements
- GNSS positioning and interference
- Ionosphere and magnetosphere dynamics
- Ocean Waves and Remote Sensing
- Inertial Sensor and Navigation
- Oceanographic and Atmospheric Processes
- Reservoir Engineering and Simulation Methods
- Earthquake Detection and Analysis
- Geomagnetism and Paleomagnetism Studies
- Geochemistry and Geologic Mapping
- Flood Risk Assessment and Management
- Hydrology and Watershed Management Studies
- Solar and Space Plasma Dynamics
- Synthetic Aperture Radar (SAR) Applications and Techniques
- Satellite Image Processing and Photogrammetry
K.N.Toosi University of Technology
2016-2024
University of Tehran
2014-2018
Geomagnetic storms are one of the leading causes ionospheric irregularities, depending on their intensity. The 6–10 September 2017 geomagnetic storm, most severe event year, resulted from an X9 solar flare and a subsequent coronal mass ejection (CME), with first sudden storm commencements (SSC) occurring at 23:43 UT day 06, coinciding Sym-H value approximately 50 nT, triggered by increase in wind. interplanetary magnetic field (IMF) disturbance time (Dst) increased when SSC occurred 6...
This study investigates the relationship between geomagnetic activities and ionospheric scintillations, focusing on how solar parameters influence disturbances across varying time frames latitudes. Utilizing indices such as Kp, Dst, sunspot numbers, F10.7 flux, we elucidate dynamics influencing conditions, which are vital for reliability of satellite communications, particularly in low-latitude regions. Our analysis demonstrates a clear correlation periods high activity increased...
The idea of the application satellite radar altimetry for inland water study has been considered about two decades. It always much challenging, because returned signal from water, in comparison to ocean one, is very different. Thus onboard processing unit would not be able determine exact tracking point. Therefore, execution waveform re-tracking efficient correct presented Range. purpose this letter three methods, namely OCOG, NASA β and Threshold known as common order monitor Louisiana...
The calibration of satellite radar altimetry has been extremely important for community and studying sea level changes. main purpose this contribution is to provide ongoing absolute altimeter bias near the Southern seas Iran using Iranian tide gauge network that equipped with GPS receivers measure surface heights synchronously in same geocentric reference frame as corresponding records. time series coastal gauges have used estimate bias, drift annual/semiannual constituents range...
Investigation of the effects geomagnetic storms on ionospheric irregularities using combination ground-based GNSS and SWARM satellites data
The international GNSS service (IGS) started publishing the precise ephemeris files in form of standard products #3, version C (the sp3c files) which GPS satellite orbits and clocks their uncertainties were available since 2004. Incorporating these into observation equations results a better stochastic model processing system. reality is questioned studied this paper. Precise point positioning (PPP) model, statistical tests variance component estimation (VCE) techniques are employed for...
<p>Ionospheric irregularities can be caused by from sun activity variations, which may cause in electron density within the ionospheric layer and, subsequently, plasma perturbations. Typical examples of these are scintillations. The fluctuations signal intensity transmitted satellite reducing signal-to-noise ratio. In addition, scintillation lead to extreme phase a transmitted. Ionospheric originate destructive effects on radio signals global navigation systems (GNSS). This...