Search Publications
Photometric Correction of Images of Visible and Near-Infrared Bands from Chandrayaan-1 Hyper-Spectral Imager (HySI): HySI Photometric Correction
Lala, Mili Ghosh Nee; Bose, Subhadyouti; Krishna, Akhouri Pramod
Photometric correction is a necessary step in planetary image pre-processing since the images of planetary surfaces are acquired by orbiting spacecraft at various observational geometries. In this study, visible (748 nm) and near-infrared (948 nm) bands of Hyper Spectral Imager (HySI) onboard Chandrayaan-1 have been used to derive a preliminary ph…
Statistical Characteristics on SEPs, Radio-Loud CMEs, Low Frequency Type II and Type III Radio Bursts Associated with Impulsive and Gradual Flares
Prakash, O.; Shanmugaraju, A.; Kim, R. -S. +1 more
We have statistically analyzed a set of 115 low frequency (Deca-Hectometer wavelengths range) type II and type III bursts associated with major Solar Energetic Particle (SEP: Ep > 10 MeV) events and their solar causes such as solar flares and coronal mass ejections (CMEs) observed from 1997 to 2014. We classified them into two sets o…
The Subjectivity in Identification of Martian Channel Networks and Its Implication for Citizen Science Projects
Jones, M.; Bahia, R. S.
The Martian surface is incised by numerous valley networks, which indicate the planet experienced sustained widespread flowing water in the past (e.g. Carr in Water on Mars, Oxford University Press, New York, 1996; Phil Trans R Soc A 370:2193–2212, 2012. https://doi.org/10.1098/rsta.2011.0500). Examining the distribution and geometries of these va…
Study of Coronal Mass Ejections Succeeding the Associated X-Ray and γ-Ray Burst Solar Flares
Abdel-Sattar, Walid; Mawad, Ramy
This study is dedicated to the investigation of the characteristics of CMEs following the associated X-ray and γ-ray burst solar flares. Investigated 14786 CME events and 5092 Gamma Burst Monitor (GBM) solar flare events recorded during the solar period 2008–2017, found 503 (about 10%) CME events associated with GBM post-flare events (hereafter, G…
3D Direct Simulation Monte Carlo Modelling of the Inner Gas Coma of Comet 67P/Churyumov–Gerasimenko: A Parameter Study
Kührt, E.; Keller, H. U.; Knollenberg, J. +9 more
Direct Simulation Monte Carlo (DSMC) is a powerful numerical method to study rarefied gas flows such as cometary comae and has been used by several authors over the past decade to study cometary outflow. However, the investigation of the parameter space in simulations can be time consuming since 3D DSMC is computationally highly intensive. For the…
Space Weather at Comet 67P/Churyumov–Gerasimenko Before its Perihelion
Odstrcil, D.; Goldstein, R.; Richter, I. +8 more
Interplanetary scintillation observations, as well as the ENLIL 3D-MHD model when employed either separately or in combination with the observations, enable the making of predictions of the solar wind density and speed at locations in the inner heliosphere. Both methods are utilized here to predict the arrival at the Rosetta spacecraft and its adj…
Transport and Distribution of Hydroxyl Radicals and Oxygen Atoms from H2O Photodissociation in the Inner Coma of Comet 67P/Churyumov–Gerasimenko
Ip, Wing-Huen; Thomas, Nicolas; Lai, Ian-Lin +5 more
With a combination of the Direct Simulation Monte Carlo (DSMC) calculation and test particle computation, the ballistic transport process of the hydroxyl radicals and oxygen atoms produced by photodissociation of water molecules in the coma of comet 67P/Churyumov–Gerasimenko is modelled. We discuss the key elements and essential features of such s…
Prometheus Induced Vorticity in Saturn's F Ring
Sutton, Phil J.; Kusmartsev, Feo V.
Saturn's rings are known to show remarkable real time variability in their structure. Many of which can be associated to interactions with nearby moons and moonlets. Possibly the most interesting and dynamic place in the rings, probably in the whole Solar System, is the F ring. A highly disrupted ring with large asymmetries both radially and azimu…
A Search for the Far-Infrared Ghost of C/2010 X1 (Elenin) with Herschel
Altieri, Bruno; Müller, Thomas; Kidger, Mark R. +1 more
Observations of Comet C/2010 X1 (Elenin) in August 2011 showed a pattern of evolution of coma morphology into an expanding, amorphous cloud of rapidly decreasing surface brightness shortly before perihelion passage, similar to C/1999 S4 (LINEAR) in 2000. However, the comet's difficult viewing geometry at the time of disruption made it impossible t…
Revisiting the Single-Fluid Modeling of the Solar Wind–Comet Interaction: Closer Look at the Cometosheath
Dryer, M.; Kartalev, M.; Keremidarska, V.
Earlier developed single fluid gas-dynamic model of solar wind–comet ionosphere interaction is applied to reveal some specifics in the morphology of the shocked "contaminated" solar wind region (cometosheath). The model is based on the Euler equations with added mass-loading, mass-loss and frictional force terms. Numerous reactions are taken into …