Climatological study of Nighttime Winter Anomaly by GRACE satellite and ground-based observations
El-Desoky, E., Mainul Hoque, M., Yousef, M., Mahrous, A. (2024). Climatological study of Nighttime Winter Anomaly by GRACE satellite and ground-based observations. EKB Journal Management System, 2(1), 53-58. doi: 10.21608/abas.2023.245912.1038
Eman Mohamed El-Desoky; Mohammed Mainul Hoque; Mohamed Yousef; Ayman Mahrous. "Climatological study of Nighttime Winter Anomaly by GRACE satellite and ground-based observations". EKB Journal Management System, 2, 1, 2024, 53-58. doi: 10.21608/abas.2023.245912.1038
El-Desoky, E., Mainul Hoque, M., Yousef, M., Mahrous, A. (2024). 'Climatological study of Nighttime Winter Anomaly by GRACE satellite and ground-based observations', EKB Journal Management System, 2(1), pp. 53-58. doi: 10.21608/abas.2023.245912.1038
El-Desoky, E., Mainul Hoque, M., Yousef, M., Mahrous, A. Climatological study of Nighttime Winter Anomaly by GRACE satellite and ground-based observations. EKB Journal Management System, 2024; 2(1): 53-58. doi: 10.21608/abas.2023.245912.1038

Climatological study of Nighttime Winter Anomaly by GRACE satellite and ground-based observations

Advances in Basic and Applied Sciences
Article 5, Volume 2, Issue 1, January 2024, Page 53-58  XML PDF (665.26 K)
Document Type: Original Article
DOI: 10.21608/abas.2023.245912.1038
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Authors
Eman Mohamed El-Desoky email 1; Mohammed Mainul Hoque2; Mohamed Yousef3; Ayman Mahrous4
1Physics Dept., Faculty of Science, Helwan University, Ain Helwan, Cairo 11795, Egypt
2German Aerospace Center (DLR),Institute for Solar Terrestrial-Physics,Kalkhorstweg 53,17235 Neustrelitz,Germany
3Physics Dept.,Faculty of Science,Helwan University,Ain Helwan,Cairo 11795,Egypt
4Physics Dept., Faculty of Science, Helwan University, Cairo, Egypt. Department of Space Environment, Institute of Basic and Applied Science, Egypt Japan University of Science and Technology, Alexandria, Egypt.
Abstract
The Ionospheric Nighttime Winter Anomaly (or seasonal anomaly) is a persistent feature in the Northern Hemisphere for the American sector and the Southern Hemisphere for the Asian longitude sector under Low Solar Activity (LSA) conditions. During the Nighttime Winter Anomaly, the mean ionization level is higher in the winter nights compared to the summer nights. The aim of this paper is to investigate the occurrence of Nighttime Winter Anomaly during LSA periods utilizing measurements of vertical total electron content (VTEC) obtained through the International Global Navigation Satellite System (GNSS) Service (IGS) during the years 2009 and 2020 for several stations located in Asian and American sectors. The NWA phenomenon was also studied through the use of electron density measurements taken from the GRACE satellite in 2009. The Midlatitude Summer Nighttime Anomaly (MSNA) is visible on the GRACE satellite in the American Southern Hemisphere and the Okhotsk Sea Anomaly (OSA) with the highest ionization in the late evening hours in the northern summer values of the Asian sector.
Keywords
Nighttime winter anomaly (NWA); electron density; GRACE satellite; Midlatitude Summer Nighttime Anomaly (MSNA); Okhotsk Sea Anomaly (OSA)
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