National Research Institute for Astronomy and Geophysics, Helwan, Egypt - Articles

Confrontation between Quantized Periods of Some Extra-Solar Planetary Systems and Observations (Articles)

A. B. Morcos

International Journal of Astronomy and Astrophysics Vol.3 No.2A, June 19, 2013

DOI: 10.4236/ijaa.2013.32A005 6,147 Downloads 8,419 Views Citations
This article belongs to the Special Issue on The Sun-Earth, Star-Planet and Planet-Moon Connections
Analytical Third Order Solution for Coupling Effects of Earth Oblateness and Direct Solar Radiation Pressure on the Motion of Artificial Satellites (Articles)

Hadia Hassan Selim

International Journal of Astronomy and Astrophysics Vol.4 No.3, September 16, 2014

DOI: 10.4236/ijaa.2014.43049 3,541 Downloads 4,754 Views Citations
On the Accuracy Assessment of the Latest Releases of GOCE Satellite-Based Geopotential Models with EGM2008 and Terrestrial GPS/Levelling and Gravity Data over Egypt (Articles)

Mohamed El-Ashquer, Basem Elsaka, Gamal El-Fiky

International Journal of Geosciences Vol.7 No.11, November 29, 2016

DOI: 10.4236/ijg.2016.711097 2,586 Downloads 4,507 Views Citations
Tracing of the Avenue of the Ram-Headed Sphinxes Remains Using Geophysical Investigations, Luxor, Egypt (Articles)

Alhussein A. Basheer, Abdelnasser M. Abdel-motaal, Ahmed El-Kotb, Ayman I. Taha, Mohammed A. Abdalla

International Journal of Geosciences Vol.5 No.8, July 30, 2014

DOI: 10.4236/ijg.2014.58070 3,090 Downloads 4,114 Views Citations
Studies of Tectonic Motion from Helwan-Satellite Laser Ranging Station (Articles)

Gamal F. Attia

International Journal of Astronomy and Astrophysics Vol.4 No.4, December 5, 2014

DOI: 10.4236/ijaa.2014.44055 3,479 Downloads 4,697 Views Citations
Feasible Multiple Satellite Mission Scenarios Flying in a Constellation for Refinement of the Gravity Field Recovery (Articles)

Basem Elsaka

International Journal of Geosciences Vol.5 No.3, March 27, 2014

DOI: 10.4236/ijg.2014.53027 4,517 Downloads 6,530 Views Citations
MASW Survey with Fixed Receiver Geometry and CMP Cross-Correlation Technique for Data Processing: A Case Study of Wadi Fatima, Western Saudi Arabia (Articles)

Faisal Rehman, Sherif M. El-Hady, Muhammad Faisal, Hussein M. Harbi, Muhammad Fahad Ullah, Saifur Rehman, Muhammad Kashif

Open Journal of Geology Vol.8 No.5, May 10, 2018

DOI: 10.4236/ojg.2018.85027 1,263 Downloads 3,757 Views Citations
New Generating Sets of the First Order Lane-Emden Differential Equations in N-Dimensional Radially Symmetric Polytropes (Articles)

M. A. Sharaf, A. S. Saad

Applied Mathematics Vol.4 No.4, April 26, 2013

DOI: 10.4236/am.2013.44090 4,917 Downloads 6,973 Views Citations
Spectral Evolution of Hercules X-1 over Main High State from RXTE/PCA Observations (Articles)

Denis A. Leahy, Mohammed H. Abdallah

Journal of High Energy Physics, Gravitation and Cosmology Vol.8 No.4, August 31, 2022

DOI: 10.4236/jhepgc.2022.84061 361 Downloads 1,024 Views Citations
Optical and Infrared Photometric Study of Old Open Star Cluster Berkeley 39 (Articles)

A. Essam, I. M. Selim

International Journal of Astronomy and Astrophysics Vol.5 No.3, September 28, 2015

DOI: 10.4236/ijaa.2015.53022 5,116 Downloads 6,285 Views Citations
Anodic Coating Characteristics of Different Aluminum Alloys for Spacecraft Materials Applications (Articles)

Afaf M. Abd El-Hameed, Yehia A. Abdel-Aziz, Fatma S. El-Tokhy

Materials Sciences and Applications Vol.8 No.2, February 8, 2017

DOI: 10.4236/msa.2017.82013 4,232 Downloads 9,483 Views Citations
Sliding Mode Control of Chaotic Motion in Electrodynamic Tethered Satellite System in an Inclined Elliptical Plane (Articles)

Ahmad Yousof Ahmad Taha, Ahmed Magdy Abdelaziz, Abd El Hakeem Abd El Naby, Yehia A. Abdel-Aziz

Journal of Applied Mathematics and Physics Vol.13 No.5, May 26, 2025

DOI: 10.4236/jamp.2025.135098 61 Downloads 401 Views Citations
Spatio-Temporal Polar-Inclined Space Mission Architecture for a Refined Retrieve of the Earth’s Gravity Field (Articles)

Basem Elsaka

World Journal of Engineering and Technology Vol.7 No.4, November 26, 2019

DOI: 10.4236/wjet.2019.74047 596 Downloads 1,447 Views Citations
A Comprehensive Study of Solar Energy Components by Using Various Models on Horizontal and Inclined Surfaces for Different Climate Zones (Articles)

Samy A. Khalil

Energy and Power Engineering Vol.14 No.10, October 21, 2022

DOI: 10.4236/epe.2022.1410031 284 Downloads 1,473 Views Citations
Shallow Seismic Refraction, Two-Dimensional Electrical Resistivity Imaging, and Ground Penetrating Radar for Imaging the Ancient Monuments at the Western Shore of Old Luxor City, Egypt (Articles)

Elsayed I. Selim, Alhussein A. Basheer, Gad Elqady, Mahfooz A. Hafez

Archaeological Discovery Vol.2 No.2, April 9, 2014

DOI: 10.4236/ad.2014.22005 6,118 Downloads 11,130 Views Citations
Relevance of AEM and TEM to Detect the Groundwater Aquifer at Faiyum Oasis Area, Faiyum, Egypt (Articles)

A. A. Basheer, A. I. Taha, A. El-Kotb, F. A. Abdalla, S. O. Elkhateeb

International Journal of Geosciences Vol.5 No.6, May 16, 2014

DOI: 10.4236/ijg.2014.56056 4,646 Downloads 6,982 Views Citations
Site Effect Estimation Using Microtremor Measurements at New Luxor City Proposed Site, South Egypt* (Articles)

Abdelnasser Mohamed, Sayed Omer El khateeb, Wael Dosoky, Mahmoud A. Abbas

Journal of Geoscience and Environment Protection Vol.9 No.9, September 29, 2021

DOI: 10.4236/gep.2021.99008 667 Downloads 2,351 Views Citations
Towards a Semi-Kinematic Datum for Egypt (Articles)

Mostafa Rabah, Ahmed Shaker, Magda Farhan

Positioning Vol.6 No.3, July 24, 2015

DOI: 10.4236/pos.2015.63006 4,849 Downloads 6,255 Views Citations
Seasonal Variation Analysis for Solar Activity Influence on “Planetarische Kennziffer” (Kp) Index during Solar Cycle 23 (Articles)

Magda Mohb-Eldin Farghaly, Sara Said Khodairy, Assem Abd-Elfattah Tharwat, Mohamed Adel Abdulaziz Sharaf, Mervat Awad, Rabab Helal Abdelhamid

International Journal of Astronomy and Astrophysics Vol.15 No.3, August 8, 2025

DOI: 10.4236/ijaa.2025.153016 46 Downloads 409 Views Citations
Halo CMEs and Solar Flux F10.6 Impact on Cloud Cover for Sc23: Case Study Africa (Articles)

Magda Mohb-Eldin Farghaly, Assem Abd-Elfattah Tharwat

International Journal of Astronomy and Astrophysics Vol.15 No.3, August 8, 2025

DOI: 10.4236/ijaa.2025.153015 41 Downloads 248 Views Citations

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