Search Publications
INRRI-EDM/2016: the first laser retroreflector on the surface of Mars
Marchetti, E.; Flamini, E.; Mugnuolo, R. +18 more
During Summer 2015 the SCF_Lab (Satellite/lunar/GNSS laser ranging/altimetry and cube/microsat Characterization Facilities Laboratory, http://www.lnf.infn.it/esperimenti/etrusco, Team of INFN-LNF, with support by ASI, carried out an intense activity of final design, manufacturing and testing in order to construct, space qualify and finally integra…
Frequency fluctuations in the solar corona investigated with radio sounding experiments on the spacecraft ROSETTA and MARS EXPRESS in 2010/2011
Pätzold, M.; Bird, M. K.; Efimov, A. I. +3 more
Coronal radio-sounding experiments were carried out using two-way coherent dual-frequency carrier signals of the ESA spacecraft ROSETTA in 2010 and MARS EXPRESS in 2010/2011. Differential frequency measurements recorded at both NASA and ESA tracking stations (sample rate: 1 Hz) are analyzed in this paper. Spectral analysis of the S-band, X-band, a…
Multi-spacecraft studies of the auroral acceleration region: From cluster to nanosatellites
Sadeghi, S.; Emami, M. R.
This paper discusses the utilization of multiple Cubesats in various formations for studies in the auroral acceleration region. The focus is on the quasi-static properties, spatio-temporal features, electric potential structures, field-aligned currents, and their relationships, all of which are fundamentally important for an understanding of the m…
Characteristics of active regions associated to large solar energetic proton events
Bronarska, K.; Michalek, G.
The relationship between properties of active regions (ARs) and solar energetic particles (SEP events, protons with energy ⩾10 MeV) is examined. For this purpose we study 84 SEP events recorded during the SOHO era (1996-2014). We compare properties of these SEP events with associated ARs, flares and CMEs. The ARs are characterized by McIntosh clas…
Gyrophase bunched ions in the plasma sheet
Wang, Zhiqiang; Zhai, Hao; Gao, Zhuxiu +1 more
Gyrophase bunched ions were first detected in the upstream region of the Earth's bow shock in the early 1980s which is formed by the microphysical process associated with reflected solar wind ions at the bow shock. Inside the magnetosphere, the results of computer simulations demonstrated that nonlinear wave-particle interaction can also result in…
Interferometry imaging technique for accurate deep-space probe positioning
Zhang, Juan; Shu, Fengchun; Liu, Lei +2 more
Very long baseline interferometry (VLBI) is a radio astronomy tool with very high spatial resolution. It uses two or more radio telescopes to track the faraway object and gets its visibility. The intensity distribution image of radio source can be obtained by the inverse Fourier transformation of the visibilities sampled on UV plane perpendicular …
Visibility of coronal mass ejections in SOHO/LASCO coronagraphs
Bronarska, K.; Michalek, G.; Yashiro, S. +1 more
We studied the detection efficiency of coronal mass ejections (CMEs) of the Large Angle Spectrometric Coronagraph (LASCO) on board the Solar and Heliospheric Observatory (SOHO). For this purpose LASCO/SOHO observations are compared with these obtained by the two Solar Terrestrial Relations Observatory (STEREO) satellites in quadrature in the perio…
Dust clouds and plasmoids in Saturn's magnetosphere as seen with four Cassini instruments
Khalisi, Emil
We revisit the evidence for a ;dust cloud; observed by the Cassini spacecraft at Saturn in 2006. The data of four instruments are simultaneously compared to interpret the signatures of a coherent swarm of dust that would have remained near the equatorial plane for as long as six weeks. The conspicuous pattern, as seen in the dust counters of the C…
The study of variations of low energy cosmic helium's flux (up to 6 MeV) due to solar activity
Shayan, M.; Davoudifar, P.; Bagheri, Z.
In General, the flux of low energy cosmic rays varies with time due to solar activities. The cosmic particle fluxes were studied using data of satellites near the Earth. In this work, first we studied the variations of particle fluxes from 1 Jan to 31 Dec 2000 and 35 events were selected. Then we proposed a relation for cosmic particle flux as a f…
The X-ray emission of the γ Cassiopeiae stars
Smith, Myron A.; Motch, C.; Lopes de Oliveira, R.
Long considered as the ;odd man out; among X-ray emitting Be stars, γ Cas (B0.5e IV) is now recognized as the prototype of a class of stars that emit hard thermal X-rays. Our classification differs from the historical use of the term ; γ Cas stars; defined from optical properties alone. The luminosity output of this class contributes significantly…