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Potential infrared relaxation channels calculated for CO2 clathrate hydrates
Lakhlifi, Azzedine; Dahoo, Pierre Richard; Chassefière, Eric
The infrared bar-spectrum of a single carbon dioxide molecule encapsulated in nano-cage clathrate hydrate is determined using the LD (Lakhlifi-Dahoo) extended site inclusion model successfully applied to analyze the spectra of CO2 isotopologues isolated in rare gas matrices. Trapping is energetically more favorable in clathrate structur…
Formation of multiple energy dispersion of H+, He+, and O+ ions in the inner magnetosphere in response to interplanetary shock
Tanaka, T.; Ebihara, Y.; Tsuji, H.
An interplanetary (IP) shock has a large impact on magnetospheric ions. Satellite observations have shown that soon after arrival of the IP shock, overall intensity of the ions rapidly increases and multiple energy dispersion appears in an energy-time spectrogram of the ions. In order to understand the response of the magnetospheric ions to IP sho…
The Hawaii SCUBA-2 Lensing Cluster Survey: Radio-detected Submillimeter Galaxies in the HST Frontier Fields
Smail, Ian; Heywood, Ian; Desai, Vandana +5 more
In this second paper of the Hawaii SCUBA-2 Lensing Cluster Survey series, we cross-match SCUBA-2 maps with 3 and 6 GHz images from the Janksy-VLA Frontier Fields Legacy Survey for three cluster fields, MACS J0416.1-2403, MACS J0717.5+3745, and MACS J1149.5+2223. Within the HST coverage, 14 out of 44 850 µm sources have 3 GHz counterparts, fi…
Solar-insolation-induced changes in the coma morphology of comet 67P/Churyumov-Gerasimenko. Optical monitoring with the Nordic Optical Telescope
Snodgrass, C.; Schulz, R.; Nilsson, K. +4 more
Context. 67P/Churyumov-Gerasimenko (67P/C-G) is a short-period Jupiter family comet with an orbital period of 6.55 yr. Being the target comet of ESA's Rosetta mission, 67P/C-G has become one of the most intensively studied minor bodies of the solar system. The Rosetta Orbiter and the Philae Lander have brought us unique information about the struc…
Neon-like Iron Ion Lines Measured in NIFS/Large Helical Device (LHD) and Hinode/EUV Imaging Spectrometer (EIS)
Hara, Hirohisa; Watanabe, Tetsuya; Murakami, Izumi +7 more
Line intensities emerging from the Ne-sequence iron ion (Fe XVII) are measured in the laboratory, by the Large Helical Device at the National Institute for Fusion Science, and in the solar corona by the EUV Imaging Spectrometer (EIS) on board the Hinode mission. The intensity ratios of Fe XVII λ 204.6/λ 254.8 are derived in the laboratory by unble…
Distribution of Field-Aligned Electron Events in the High-Altitude Polar Region: Cluster Observations
Dunlop, Malcolm; Carr, Chris; Torkar, Klaus +4 more
Field-aligned electrons (FAEs) are important for the energy transport in the solar wind-magnetosphere-ionosphere coupling. However, the distribution of FAEs and the concerning physical mechanism in different altitudes of the polar region are still unclear. In this paper, data from the Cluster spacecraft were used to study the characteristics of FA…
Validation of single spacecraft methods for collisionless shock velocity estimation
Pope, Simon A.; Walker, Simon N.; Collinson, Glyn +1 more
The velocity of a collisionless shock (CS) is an important parameter in the determination of the spatial scales of the shock. The spatial scales of the shock determine the processes that guide the energy dissipation, which is related to the nature of the shock. During the pre-ISEE era, estimations of relative shock-spacecraft velocity (VSh
Running of featureful primordial power spectra
Mena, Olga; Boubekeur, Lotfi; Gariazzo, Stefano +2 more
Current measurements of the temperature and polarization anisotropy power spectra of the cosmic microwave background (CMB) seem to indicate that the naive expectation for the slow-roll hierarchy within the most simple inflationary paradigm may not be respected in nature. We show that a primordial power spectrum with localized features could in pri…
A Long-Term Decrease of the Mid-Size Segmentation Lengths Observed in the He II (30.4 nm) Solar EUV Emission
Didkovsky, Leonid; Wieman, Seth; Korogodina, Elena
Power spectra of segmentation-cell length (a dominant length scale of EUV emission in the transition region) from full-disk He II extreme ultraviolet (EUV) images observed by the Extreme ultraviolet Imaging Telescope (EIT) onboard the Solar and Heliospheric Observatory (SOHO) and the Atmospheric Imaging Assembly (AIA) onboard the Solar Dynamics Ob…
Is the Pollock's paradigm of X-ray emission for O stars correct?
Kholtygin, A. F.; Ryspaeva, E. B.
We considered the mechanism of the formation of the X-ray emission for massive stars. The X-ray spectra of 25 O stars were extracted from the archive of XMM-Newton data obtained in 2000-2014. We determined the distribution of the ratio of half-width at half-maximum to the wind terminal velocity for strong isolated spectral lines in the spectra of …