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Using the transit of Venus to probe the upper planetary atmosphere
Piccioni, Giuseppe; Reale, Fabio; Widemann, Thomas +3 more
During a planetary transit, atoms with high atomic number absorb short-wavelength radiation in the upper atmosphere, and the planet should appear larger during a primary transit observed in high-energy bands than in the optical band. Here we measure the radius of Venus with subpixel accuracy during the transit in 2012 observed in the optical, ultr…
Simulating charge transport to understand the spectral response of Swept Charge Devices
Narendranath, S.; Sreekumar, P.; Athiray, P. S. +1 more
Context. Swept Charge Devices (SCD) are novel X-ray detectors optimized for improved spectral performance without any demand for active cooling. The Chandrayaan-1 X-ray Spectrometer (C1XS) experiment onboard the Chandrayaan-1 spacecraft used an array of SCDs to map the global surface elemental abundances on the Moon using the X-ray fluorescence (X…
In situ magnetotail magnetic flux calculation
Gordeev, E.; Shukhtina, M. A.
We explore two new modifications of the magnetotail magnetic flux (F) calculation algorithm based on the Petrinec and Russell (1996) (PR96) approach of the tail radius determination. Unlike in the PR96 model, the tail radius value is calculated at each time step based on simultaneous magnetotail and solar wind observations. Our former algorithm, d…
Modeling of the electromagnetic ion cyclotron wave generation in the H+-He+ plasma of the inner magnetosphere
Lubchich, Andris A.; Semenova, Nadezhda V.
Behaviors of the integrated wave gain of electromagnetic ion cyclotron (EMIC) waves in the H+-He+ plasma of the inner magnetosphere is investigated. The integrated wave gain is obtained by integration of a temporal local growth rate along a geomagnetic field line. The local growth rate is determined by the method of Kennel an…
Young star clusters in the interacting galaxies of Hickson Compact Group 90
Sharples, R. M.; Cho, J.; Miah, J. A.
Deep images of Hickson Compact Group 90 (HCG 90) have been obtained using the Advanced Camera for Surveys on the Hubble Space Telescope. We report results for star clusters observed in the interacting pair of galaxies NGC 7174 and NGC 7176. We present magnitude and colour distributions for the observed cluster population and find that the majority…
Improved Views of the Moon in the Early Twenty First Century: A Review
Yang, Hongwei; Zhao, Wenjin
The twenty first century was an exciting epoch in planetary exploration, when a large number of lunar scientific achievements were accomplished. New missions in the first decade of the twenty first century have herald a new and exciting phase in lunar exploration, including LRO, LCROSS, the dual GRAIL orbiters, Kaguya, Chandrayaan 1, and the Chang…
Adaptation of the de Hoffmann-Teller frame for quasi-perpendicular collisionless shocks
Narita, Y.; Motschmann, U.; Comişel, H.
The concept of the de Hoffmann-Teller frame is revisited for a high Mach-number quasi-perpendicular collisionless shock wave. Particle-in-cell simulation shows that the local magnetic field oscillations in the shock layer introduce a residual motional electric field in the de Hoffmann-Teller frame, which is misleading in that one may interpret tha…
LMC S63: a historical reappraisal of the outburst behaviour of a deeply eclipsing Magellanic symbiotic star
Gromadzki, Mariusz; Miszalski, Brent; Iłkiewicz, Krystian +2 more
We present an analysis of multi-epoch low-resolution spectrophotometry, complemented by the light curves provided by massive photometric surveys spanning over 100 yr, of the symbiotic binary LMC S63. We showed that it is an eclipsing binary with the orbital period of 1050 d. We also found evidence of outbursts in history of the white dwarf. If it …
High-latitude, Transluscent Molecular Clouds as Probes of Local Cosmic Rays
Abrahams, Ryan D.; Paglione, Timothy A. D.
We analyze the gamma ray emission from nine high latitude, translucent molecular clouds taken with the Fermi Large Area Telescope between 250 MeV and 10 GeV. Observations of gamma rays allow us to probe the density and spectrum of cosmic rays in the solar neighborhood. The clouds studied lie within ∼270 pc from the Sun and are selected from the Pl…
Spectral properties of the soft excess pulsar RX J0059.2-7138 during its 2013 outburst
Tiengo, A.; Mereghetti, S.; Sidoli, L. +2 more
We report on an X-ray observation of the Be X-ray binary pulsar RX J0059.2-7138, performed by XMM-Newton in 2014 March. The 19 ks long observation was carried out about three months after the discovery of the latest outburst from this Small Magellanic Cloud transient, when the source luminosity was LX ∼1038 erg s-1…