Search Publications
Observation of galactic cosmic ray spallation events from the SoHO mission 20-yr operation of LASCO
Koutchmy, S.; Tavabi, E.; Urtado, O.
A shower of secondary cosmic ray (CR) particles is produced at high altitudes in the Earth's atmosphere, so the primordial galactic cosmic rays (GCRs) are never directly measured outside the Earth magnetosphere and atmosphere. They approach the Earth and other planets in the complex pattern of rigidity's dependence, generally excluded by the magne…
Spectroscopy of Planetary Nebulae with Herschel: A Beginners Guide
Exter, Katrina
A brief overview of the Herschel Space Telescope PACS and SPIRE spectrographs is given, pointing out aspects of working with the data products that should be considered by anyone using them. Some preliminary results of Planetary Nebulae (PNe) taken from the Herschel Planetary Nebula Survey (HerPlaNs) programme are then used to demonstrate what can…
Results of Photometric and Spectroscopic Observations of the Young Variable Star V730 Cep
Grinin, V. P.; Mkrtichian, D.; Potravnov, I. S. +1 more
We present the results of our photometric ( V RI) and spectroscopic observations of the young variable star V730 Cep (MisV1147) classified by Uemura et al. (2004) as a Herbig Be star. Our photometry confirms the conclusion of the above authors that this star has a complex pattern of variability including periodic or quasi-periodic brightness varia…
A fresh approach to stellar benchmarking
Beaton, Rachael
An avalanche of data is about to revolutionize astronomy, but the options for validating those data have been limited. High-precision measurements from the Hubble Space Telescope enable a much-needed alternative option.
MarsTEM sensor simulations in Martian dust environment
Colombatti, Giacomo; Bettanini, Carlo; Aboudan, Alessio +6 more
A wind tunnel test campaign has been conducted prior to the landing of the Exomars2016 EDM module on the Meridiani Planum on the 19th of October 2016. Test were performed in the Mars wind tunnel facility at Aahrus University (DK) under the 2015 Europlanet Call. The facility was available for a 5 days campaign where different environmental configur…
A shear BY field in the Earth's magnetotail and its variations in the current sheet
Malova, Helmi V.; Grigorenko, Elena E.; Zelenyi, Lev M. +2 more
We use Cluster and THEMIS simultaneous observations to study the spatial distributions of a shear BY field in the Plasma Sheet (PS) of the Earth's magnetotail at -31 RE < X < -9 RE. The best correlation between the BY field in the PS (BY_PS) and the Y-component of the Interplanetary Magn…
Indirect Detection of Extrasolar Planets via Astrometry
Matthews, B. C.; Butler, B. J.
Radio wavelength astrometry of stars and other objects has a long and productive history. The use of that technique to determine whether stars have planets around them would cover a nearly unique part of the parameter space for detection of those systems. Namely, astrometric observations are most sensitive to systems with large planets in moderate…
The TIRVIM Fourier Spectrometer for Studying the Martian Atmosphere
Shakun, A. V.; Moshkin, B. E.; Patsaev, D. V. +3 more
The design and performance features of an IR Fourier-transform spectrometer for studying the Martial atmosphere in the spectrum range of 600-5500 cm-1 during the ExoMars-2016 mission are described. The obtained spectral resolution is in agreement with the theoretical value (0.2 cm-1); the threshold of the instrument sensitivi…
Physics of Partial Ionization in the Solar Chromosphere Revealed by the Solar Optical Telescope Onboard Hinode
Isobe, Hiroaki
The Time-Dependent Wavelet Spectrum of HH 1 and 2
Raga, A. C.; Esquivel, A.; Riera, A. +2 more
We have calculated the wavelet spectra of four epochs (spanning ≈20 yr) of Hα and [S II] HST images of HH 1 and 2. From these spectra we calculated the distribution functions of the (angular) radii of the emission structures. We found that the size distributions have maxima (corresponding to the characteristic sizes of the observed structures) wit…