Search Publications
Deep learning-based prediction of CME-driven shock standoff distances in metric type II radio emissions
Elsaid, Ahmed; Mahrous, Ayman; Hamada, Amr +1 more
Type II radio emissions are events mostly found to be associated with coronal mass ejections (CMEs) and accelerated by the CME-driven shock in the heliosphere. This study reports on the estimation of the CME-shock standoff distance at the commencement of metric type II radio emissions by combining the CME-deprojected speed and spectral features of…
Tracing shock waves: type II radio emission on 27th of September 2001
Al-Hamadani, Firas; Al-Sawad, Amjad
This study focus on atypical Type II radio bursts observed in conjunction with three simultaneous coronal mass ejections (CMEs) on September 27, 2001. These CMEs originated from a single active region (AR) and were linked to relatively weak solar flares. Analysis of the CME sequences revealed distinct periods of interplanetary (IP) Type II radio e…
Perturbation effect of solar radiation pressure on the Sun-Earth co-orbital motion
Zhao, Mingxu; Qi, Yi; Qiao, Dong
Sun-Earth co-orbital motions have an important value in deep space explorations due to their unique orbital characteristics and spatial configurations. In this paper, we investigate the influence of the solar radiation pressure (SRP) on the Sun-Earth co-orbital motion. Firstly, we derive several analytical formulas of the effect of the SRP on orbi…
Investigations on halo coronal mass ejections, sunspots and their geoeffectiveness in the rising phase of the solar cycle 25
Mujiber Rahman, A.; Kubera Raja, A.
In this research paper we investigated the halo coronal mass ejections and sunspot number during the period December 2019 to December 2023 for the rising phase of solar cycle 25. The SOHO/LASCO instrument observed 145 HCMEs during this period. We selected 145 halo CMEs and the associated flares, SSN and Dst. The HCME is found to be significantly f…
Solar source longitudinal dependence of SEPs and their association with solar flares and radio-loud CMEs
Moon, Y. -J.; Pappa Kalaivani, P.; Prakash, O. +4 more
In this article we examine the occurrence probability of 104 major (
Characterization of ionospheric irregularities over the equatorial and low latitude Nigeria region
Simi, K. G.; Ogwala, Aghogho; Oyedokun, Oluwole John +5 more
Ionospheric irregularity poses severe challenges to the highly dynamic satellite communication, navigation and tracking operations that rely on transionospheric satellite services like the operation of the Global Navigation Satellite System (GNSS). Although numerous studies on the effect of geomagnetic storms on the inhibition or suppression of ir…
Variation of ionospheric plasma density during the annular solar eclipse on December 26, 2019
Palit, Sourav; Kundu, Subrata; Chowdhury, Swati +2 more
The annular solar eclipse of the previous decade that occurred on December 26, 2019, was mostly visible from most Asian countries, including India. In this manuscript, we present the variation of ionospheric plasma density profiles at different heights during the eclipse and non-eclipse days. We use both the ground- and space-based instruments to …
Active region and flare ribbon properties associated with X-class flares and CMEs of solar cycle 24
Moon, Y. -J.; Shanmugaraju, A.; Lim, Daye +4 more
The solar eruptive events and their origin are important in the context of forecasting their occurrence and their effects on the space and the earth. In this paper, a set of 45 X-class flare-associated coronal mass ejections (CMEs) and their source region characteristics are analysed. The X-ray flares and white light CMEs were observed by GOES and…
Constructing a global ionospheric TEC map with a high spatial and temporal resolution by spherical harmonic functions
Xiong, Bo; Wang, Yuqing; Li, Xiaolin +2 more
The Massachusetts Institute of Technology (MIT) Haystack Observatory provides the ionospheric Total Electron Content (TEC) data with a temporal resolution of 5 minutes and limited spatial coverage, as they do not provide data where there are no TEC measurements. To improve the spatial coverage of MIT-TEC, we have proposed an approach for construct…
Kinematics and interplanetary characteristics of a halo Coronal Mass Ejection: a multi-wavelength analysis
Ebenezer, E.; Soni, Shirsh Lata
In this paper, we present the evolution and speed expansion of a shock driven by a Coronal Mass Ejection (CME) that triggered a type II radio. We combine radio analysis with a broad range of observations taken by other ground-based and space borne observatories to track the evolution of this CME/shock from Sun to 1 AU. The Halo CME studied here oc…