Search Publications
Where is the base of the Transition Region? Evidence from TRACE, SDO, IRIS and ALMA observations
Alissandrakis, Costas E.
Classic solar atmospheric models put the Chromosphere-Corona Transition Region (CCTR) at ∼ 2 Mm above the τ5000 = 1 level, whereas radiative MHD (rMHD) models place the CCTR in a wider range of heights. However, observational verification is scarce. In this work we review and discuss recent results from various instruments and spectral …
Development of a dynamical model of a release mechanism for in-flight performance prediction
Dalla Ricca, Edoardo; Bortoluzzi, Daniele; Vignotto, Davide +1 more
LISA Pathfinder (LPF) was an ESA mission which was launched to test the most relevant technologies for the forthcoming mission, named LISA, which will be the first gravitational wave observer in space. The LPF payload includes two gravitational reference sensors, each one containing the sensing body of the experiment, i.e. a cubic-shaped test-mass…
Understanding the mineralogy of a compositional anomaly north of the Korolev basin using Moon mineralogy mapper
Chaudhuri, N.; Kusuma, K. N.; Aravind Bharathvaj, S.
The work attempts to understand the mineralogy of the reported geochemical anomaly located in the north - northeast region of the Korolev basin using Moon Mineralogy Mapper (M3) onboard Chandrayaan -1 and other lunar datasets. To understand the mineralogy, colour composite images using integrated band depth parameters and mineral indice…
Earth's magnetotail variability during supersubstorms (SSSs): A study on solar wind-magnetosphere-ionosphere coupling
Hajra, Rajkumar; Echer, Ezequiel; Franco, Adriane Marques de Souza +1 more
Supersubstorm (SSS) events are associated with extremely intense westward auroral electrojet currents (the minimum SuperMAG AL or SML < - 2500 nT) resulting from the solar wind-magnetosphere coupling. We present, for the first time, variability of the Earth's magnetotail and coupling from the solar wind to magnetotail, geosynchronous orbit and …
A spectroscopic measurement of high velocity spray plasma from an M-class flare and coronal mass ejection
Young, Peter R.
The M1.5-class flare and associated coronal mass ejection (CME) of 16 February 2011 was observed with the Extreme ultraviolet Imaging Spectrometer on board the Hinode spacecraft. Spray plasma associated with the CME is found to exhibit a Doppler blue-shift of 850 km s-1 - one of the largest values reported from spectroscopy of the solar…
Solar radio bursts observations by Egypt- Alexandria CALLISTO spectrometer: First results
Kozarev, K.; Minta, F. N.; Nozawa, S. I. +2 more
The newly installed CALLISTO spectrometer, hosted by the Department of Space Environment, Institute of Basic and Applied Sciences- EJUST, commenced operation on August 14, 2021. The system contains a cross dipole long-wavelength array antenna with high sensitivity to monitor solar radio transients. Its antenna was strategically positioned and appe…
The radiometric environment for Mars limb observations by the Mars Sample Return Earth Return Orbiter
Montmessin, Franck; Titov, Dmitri; Wolff, Michael J. +17 more
After launching from the martian surface via the Mars Ascent Vehicle (MAV), the MAV and the Orbiting Sample (OS) capsule containing the samples collected on Mars by the Perseverance rover are to be identified by the Narrow Angle Camera (NAC) on the Earth Return Orbiter (ERO) spacecraft in order to determine the exact orbit of the capsule before re…
Asteroid landing analysis for multi-node probe based on spring damping device
Wang, Bang; Xu, Rui; Li, Zhaoyu +3 more
Soft landing on the surface of an asteroid is a prerequisite for performing surface exploration. Due to the weakness of gravitational field, complex surface, and unknown soil properties of asteroids, a single probe may rebound from the surface with uncontrollable long-range tumbling during landing, leading to a deviation from its original landing …
Super rogue waves at Venusian ionosphere and mantle
El-Shafeay, N. A.; El-Taibany, W. F.; Moslem, W. M. +1 more
Formation of super rogue ion-acoustic wave is suggested as a physical catalyst for the photochemical reaction to form the Venusian ionosphere and its mantle. Based on the observed data at Venus by Pioneer Venus Orbiter (PVO) and Venus Express (VEX), we constructed our models. The plasma model of the ionosphere consists of two positive ions fluid (…
Coronal spectroscopy: Probing sources of slow solar wind in active regions, and the early phases of solar flares
Harra, Louise K.
Coronal spectroscopy has pushed forward the understanding of physical processes in all phenomena on the Sun. In this review we concentrate specifically on plasma parameters measured in sources of the slow solar wind in active regions and the early phases of solar flares. These topics are a key part of the science goals of the Solar Orbiter mission…