Search Publications
The DREAMS experiment flown on the ExoMars 2016 mission for the study of Martian environment during the dust storm season
Debei, S.; Molinaro, R.; Marchetti, E. +18 more
The DREAMS (Dust characterization, Risk assessment and Environment Analyser on the Martian Surface) instrument on Schiaparelli lander of ExoMars 2016 mission was an autonomous meteorological station designed to completely characterize the Martian atmosphere on surface, acquiring data not only on temperature, pressure, humidity, wind speed and its …
Turbulence and Heating in the Flank and Wake Regions of a Coronal Mass Ejection
He, Jiansen; Tian, Hui; Wang, Linghua +5 more
As a coronal mass ejection (CME) passes, the flank and wake regions are typically strongly disturbed. Various instruments, including the Large Angle and Spectroscopic Coronagraph (LASCO), the Atmospheric Imaging Assembly (AIA), and the Coronal Multi-channel Polarimeter (CoMP), observed a CME close to the east limb on 26 October 2013. A hot (≈10 MK…
On the concordance of cosmological data in the case of the generalized Chaplygin gas
Aurich, R.; Lustig, S.
The generalized Chaplygin gas cosmology provides a prime example for the class of unified dark matter models, which substitute the two dark components of the standard cosmological ΛCDM concordance model by a single dark component. The equation of state of the generalized Chaplygin gas is characterised by a parameter α such that the standard ΛCDM m…
CCD Photometry, Light Curve Modeling and Period Analysis of the Overcontact Eclipsing Binary BN Ari
Alton, K. B.; Nelson, R. H.; Boyd, D. R. S.
We present photometric and spectroscopic data of BN Ari, a totally eclipsing variable star. 15 new times-of-minimum have been determined. These along with other published eclipse timings were used to update the linear ephemeris and evaluate changes in orbital periodicity. Radial velocity data along with a definitive classification spectrum are rep…
Generation Mechanism for Interlinked Flux Tubes on the Magnetopause
Facskó, G.; Sibeck, D.; Gonzalez, W. D. +4 more
We use a global magnetohydrodynamics simulation to analyze transient magnetic reconnection processes at the magnetopause. The solar wind conditions have been kept constant, and an interplanetary magnetic field with large duskward BY and southward BZ components has been imposed. Five flux transfer events (FTEs) with clear bipo…
Characterizing K2 Candidate Planetary Systems Orbiting Low-mass Stars. III. A High Mass and Low Envelope Fraction for the Warm Neptune K2-55b
Gorjian, Varoujan; Knutson, Heather A.; Schlieder, Joshua E. +23 more
K2-55b is a Neptune-sized planet orbiting a K7 dwarf with a radius of {0.715}-0.040+0.043 {R}⊙ , a mass of 0.688 ± 0.069 {M}⊙ , and an effective temperature of {4300}-100+107 K. Having characterized the host star using near-infrared spectra obtained at IRTF/SpeX, we observed a trans…
Test of general relativity during the BepiColombo interplanetary cruise to Mercury
Schettino, Giulia; Serra, Daniele; Tommei, Giacomo +1 more
The theory of general relativity first introduced the concept that space-time is curved by the presence of masses. As a consequence, any signal between two sources passing by a massive body is deflected and therefore experiences a transmission time delay with respect to the straight-line propagation. In the parametrized Post-Newtonian formalism—wh…
Shock deceleration in interplanetary coronal mass ejections (ICMEs) beyond Mercury's orbit until one AU
Krupar, Vratislav; Grison, Benjamin; Souček, Jan +4 more
The CDPP propagation tool is used to propagate interplanetary coronal mass ejections (ICMEs) observed at Mercury by MESSENGER to various targets in the inner solar system (VEX, ACE, STEREO-A and B). The deceleration of ICME shock fronts between the orbit of Mercury and 1 AU is studied on the basis of a large dataset. We focus on the interplanetary…
Subsidence of Ionospheric Flows Triggered by Magnetotail Magnetic Reconnection During Transpolar Arc Brightening
Pu, Zu-Yin; Fu, Sui-Yan; Shi, Quan-Qi +8 more
A transpolar arc (TPA), which extended from postmidnight to prenoon, was seen on 16 September 2001 in the Northern Hemisphere under northward interplanetary magnetic field (IMF)-Bz and weakly dawnward IMF-By conditions. Super Dual Auroral Radar Network detected significant westward plasma flows just equatorward of the polewar…
Intense Geomagnetic Storms Associated with Coronal Holes Under the Weak Solar-Wind Conditions of Cycle 24
Watari, S.
The activity of Solar Cycle 24 has been extraordinarily low. The yearly averaged solar-wind speed is also lower in Cycle 24 than in Cycles 22 and 23. The yearly averaged speed in the rising phase of Cycle 21 is as low as that of Cycle 24, although the solar activity of Cycle 21 is higher than that of Cycle 24. The relationship between the solar-wi…