Search Publications
Velocity shear Kelvin-Helmholtz instability with inhomogeneous DC electric field in the magnetosphere of Saturn
Kandpal, Praveen; Kaur, Rajbir; Pandey, R. S.
In this paper parallel flow velocity shear Kelvin-Helmholtz instability has been studied in two different extended regions of the inner magnetosphere of Saturn. The method of the characteristic solution and kinetic approach has been used in the mathematical calculation of dispersion relation and growth rate of K-H waves. Effect of magnetic field (…
GIADA performance during Rosetta mission scientific operations at comet 67P
Fulle, M.; Rodriguez, J.; Colangeli, L. +16 more
The Grain Impact Analyser and Dust Accumulator (GIADA) instrument onboard Rosetta studied the dust environment of comet 67P/Churyumov-Gerasimenko from 3.7 au inbound, through perihelion, to 3.8 au outbound, measuring the dust flow and the dynamic properties of individual particles. GIADA is composed of three subsystems: (1) Grain Detection System …
CME productivity associated with Solar Flare peak X-ray emission flux
Suryanarayana, G. S.; Balakrishna, K. M.
It is often noticed that the occurrence rate of Coronal Mass Ejections (CMEs) increases with increase in flare duration where peak flux too increase. However, there is no complete association between the duration and peak flux. Distinct characteristics have been reported for active regions (ARs) where flares and CMEs occur in contrast to ARs where…
Electric potential structures of auroral acceleration region border from multi-spacecraft Cluster data
Sadeghi, S.; Emami, M. R.
This paper studies an auroral event using data from three spacecraft of the Cluster mission, one inside and two at the poleward edge of the bottom of the Auroral Acceleration Region (AAR). The study reveals the three-dimensional profile of the region's poleward boundary, showing spatial segmentation of the electric potential structures and their d…
A novel star identification technique robust to high presence of false objects: The Multi-Poles Algorithm
Schiattarella, Vincenzo; Spiller, Dario; Curti, Fabio
This work proposes a novel technique for the star pattern recognition for the Lost in Space, named Multi-Poles Algorithm. This technique is especially designed to ensure a reliable identification of stars when there is a large number of false objects in the image, such as Single Event Upsets, hot pixels or other celestial bodies. The algorithm ide…
Spectral manifestations of extremely strong magnetic fields in the sunspot umbra
Lozitsky, V. G.
Fine peculiarities of the Zeeman effect in two big sunspots of October 29, 2003, and October 25, 2014, are analyzed. In order to search spectral evidences of very strong spatially unresolved magnetic fields, the Stokes I ± V and V profiles of the Fe I 6301.5 and 6302.5 Å lines are studied in detail. Confirmed are two effects discovered earlier by …
25 MeV solar proton events in Cycle 24 and previous cycles
Richardson, Ian G.; Cane, Hilary V.; von Rosenvinge, Tycho T.
We summarize observations of around a thousand solar energetic particle (SEP) events since 1967 that include ∼25 MeV protons, made by various near-Earth spacecraft (IMPs 4, 5, 7, 8, ISEE 3, SOHO), that encompass Solar Cycle 20 to the current cycle (24). We also discuss recent observations of similar SEP events in Cycle 24 made by the STEREO spacec…
DREAMS-SIS: The Solar Irradiance Sensor on-board the ExoMars 2016 lander
Toledo, D.; Gómez, L.; Apéstigue, V. +10 more
The Solar Irradiance Sensor (SIS) was part of the DREAMS (Dust characterization, Risk assessment, and Environment Analyzer on the Martian Surface) payload package on board the ExoMars 2016 Entry and Descent Module (EDM), "Schiaparelli". DREAMS was a meteorological station aimed at the measurement of several atmospheric parameters, as well as the p…
Observations of Phobos by the Mars Express radar MARSIS: Description of the detection techniques and preliminary results
Plettemeier, D.; Orosei, R.; Plaut, J. J. +4 more
The Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS) (Picardi et al., 2005) is a synthetic aperture low frequency radar altimeter, onboard the ESA Mars Express orbiter, launched in June 2003. It is the first and so far the only spaceborne radar that has observed the Martian moon Phobos. Radar echoes were collected on different f…
On-ground testing of the role of adhesion in the LISA-Pathfinder test mass injection phase
Bortoluzzi, D.; Zanoni, C.; Conklin, J. W.
Many space missions share the need to fly a free-falling body inside the spacecraft, as a reference for navigation and/or as a probe for the local gravitational field. When a mechanism is required to cage such an object during the launch phase, the need arises to release it to free-fall once the operational phase must be initiated in orbit. The cr…