Search Publications
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…
Interacting planetary nebulae III: verification and galactic population based on the measurements of Gaia EDR3
Ali, A.; Mindil, A.; Mohery, M. +1 more
The phenomenon of interaction between planetary nebulae (PNe) and the interstellar medium (ISM) is one of the significant issues in the field of astrophysics. The main objective of this paper is to verify the interaction process for objects that have been known as interacting PNe (IPNe) in the literature. This study is based on parallax and proper…
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…
Age-velocity relations with GALEXF U V
Murray-Clay, Ruth; Crandall, Sara; Smith, Graeme H. +3 more
A relationship between chromospheric activity and age is calibrated for FGK dwarf stars using GALEX
Mass evaluation for red giant stars based on the spectroscopically determined atmospheric parameters
Takeda, Yoichi
The mass (
A radio continuum study of NGC 2082
Filipović, M. D.; Dai, S.; Barnes, L. +2 more
We present radio continuum observations of NGC 2082 using ASKAP, ATCA and Parkes telescopes from 888 MHz to 9000 MHz. Some 20 arcsec from the centre of this nearby spiral galaxy, we discovered a bright and compact radio source, J054149.24–641813.7, of unknown origin. To constrain the nature of J054149.24–641813.7, we searched for transient events …
XMM-Newton and Swift observations of the Seyfert 1 AGN NGC 5940
Adegoke, Oluwashina K.
Probing the physics of the accretion flow around active galactic nuclei (AGN) is crucial to understanding their emission mechanisms as well as being able to constrain the geometrical and variability properties of the different regions around them. The soft X-ray excess – usually observed below
Red giant branch bump brightness in 7 metal-poor globular clusters obtained with GAIA DR2
Nie, Jundan; Wu, Tao; Pietrinferni, Adriano +10 more
The identification of the red giant branch bump brightness in metal-poor globular clusters is important for low-mass stellar evolution. The release of Gaia DR2 prompted us to revisit the red giant branch bump (RGBB) in galactic globular clusters. We apply a popular nonparametric density estimation approach, kernel density estimation (KDE), to expl…
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…