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Search for horizontal and vertical variations of CO in the day and night side lower mesosphere of Venus from CSHELL/IRTF 4.53 µm observations
Bertaux, Jean-Loup; Lellouch, Emmanuel; Marcq, Emmanuel +3 more
High-resolution (R ~ 43 , 000) spectroscopic observations of both day and night sides of Venus were acquired using CSHELL at IRTF between 2202 and 2207cm-1 (4.53- 4.54 µm) during the latest maximal eastern and western elongations of Venus in two four-nights observing runs in August 2012 and November 2013. Their purpose was to inve…
Survey of caveats in low-energy particle measurements: Ulysses/HI-SCALE and ACE/EPAM Instruments
Malandraki, O. E.; Anagnostopoulos, G. C.; Marhavilas, P. K.
"Heliosphere Instrument for Spectra, Composition, and Anisotropy at Low Energies" (HI-SCALE) onboard the ULYSSES spacecraft, and "Electron, Proton, and Alpha Monitor" (EPAM) onboard the ACE spacecraft, are very similar instruments and were designed to make measurements of ions and electrons over a broad range of energy and intensity. The ions (E
Dynamics of polar vortices at cloud top and base on Venus inferred from a general circulation model: Case of a strong diurnal thermal tide
Yamamoto, Masaru; Takahashi, Masaaki
Polar vortices in the presence of a thermal tide are investigated using a Venusian middle atmosphere general circulation model. Around the cloud top, where the warm polar region is maintained by the thermal wind associated with a high latitude jet, the temperature contrast forms the polar vortex pattern. The cold collar and hot oval (monopole) nea…
Storms on Venus: Lightning-induced chemistry and predicted products
Baines, K. H.; Delitsky, M. L.
Observations by many spacecraft that have visited Venus over the last 40 years appear to confirm the presence of lightning storms in the Venus atmosphere. Recent observations by Venus Express indicate that lightning frequency and power is similar to that on Earth. While storms are occurring, energy deposition by lightning into Venus atmospheric co…
Mars as a comet: Solar wind interaction on a large scale
Holmstrom, Mats; Wang, Xiao-Dong
Looking at the Mars-solar wind interaction on a larger spatial scale than the near Mars region, the planet can be seen as an ion source interacting with the solar wind, in many ways like a comet, but with a smaller ion source region. Here we study the interaction between Mars and the solar wind using a hybrid model (particle ions and fluid electro…
Error analysis for retrieval of Venus' IR surface emissivity from VIRTIS/VEX measurements
Haus, Rainer; Kappel, David; Arnold, Gabriele
Venus' surface emissivity data in the infrared can serve to explore the planet's geology. The only global data with high spectral, spatial, and temporal resolution and coverage at present is supplied by nightside emission measurements acquired by the Visible and InfraRed Thermal Imaging Spectrometer VIRTIS-M-IR (1.0 - 5.1 µm) aboard ESA's Ve…
Corrigendum to "The Sunlit lunar atmosphere: A Comprehensive study by CHACE on the Moon Impact Probe of Chandrayaan-1" [Planet. Space Sci. 58 (2010) 1567-1577]
Sridharan, R.; Ahmed, S. M.; Sreelatha, P. +4 more
The authors regret, an inadvertent error that could creep in while one attempts to estimate the number densities based on the reported lunar atmospheric composition data from the CHACE measurements in CHANDRAYAAN-1, the first Indian mission to the moon has been identified.
The role of ion-neutral collisions in Titan's magnetospheric interaction
Sillanpää, Ilkka; Johnson, Robert E.
We have studied the effects of ion-neutral collisions on Titan's interaction with the magnetospheric plasma flow and also on the Alfvén wings formed in this super-Alfvénic interaction. We have used the HYB-Titan hybrid simulation model to study the role of charge exchange processes and elastic ion collisions in the interaction region. The simulati…
Acceleration of ions and nano dust at a comet in the solar wind
Kallio, E.; Gunell, H.; Nilsson, H. +6 more
A quasi-neutral hybrid simulation of the interaction of the solar wind with the atmosphere of a comet is used together with a test particle simulation of cometary ions and dust to compute trajectories and velocity distribution functions of charged particles, starting outside the diamagnetic cavity at 150 km cometocentric distance. The simulations …
Oxygen foreshock of Mars
Barabash, S.; Lundin, R.; Holmström, M. +3 more
Mars Express (MEX) has operated for more than 10 years in the environment of Mars, providing solar wind ion observations from the Analyzer of Space Plasmas and Energetic Atoms experiment's Ion Mass Analyser (IMA). On 21 September 2008, MEX/IMA detected foreshock-like discrete distributions of oxygen ions at around 1 keV in the solar wind attached …