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Spectral characteristics of the Titanian haze at 1-5 micron from Cassini/VIMS solar occultation data
Courtin, Régis; Kim, Sang J.
We retrieved optical-depth spectra of the Titanian haze in the range 1-5 µm from solar occultation data obtained by the Cassini/Visual Infrared Mapping Spectrometer (VIMS) at altitudes of 59-502 km. Only limited wavelength intervals within this spectral range have been analyzed before. The haze spectra we retrieved are mostly similar to thos…
A model of scattered thermal radiation for Venus from 3 to 5µm
Hueso, R.; Sánchez-Lavega, A.; García Muñoz, A. +2 more
Thermal radiation becomes a prominent feature in the continuum spectrum of Venus longwards of ∼3µm. The emission is traceable to the upper cloud and haze layers in the planet's mesosphere. Venus' thermal radiation spectrum is punctuated by CO2 bands of various strengths probing into different atmospheric depths. It is thus possibl…
Observations of 6-200 µm emission of the Ophiuchus cloud LDN 1688
Juvela, M.; Lemke, D.; Lehtinen, K. +2 more
We examine two positions, ON1 and ON2, within the Ophiuchus cloud LDN 1688 using observations made with the ISO photo-polarimeter (ISOPHOT) instrument aboard the Infrared Space Observatory (ISO) satellite. The data include mid-infrared spectra (∼6-12 µm) and several photometric bands up to 200 µm. The data probe the emission from molec…
Mg II h + k Flux—Rotational Period Correlation for G-type Stars
Bertone, Emanuele; Olmedo, Manuel; Chávez, Miguel +1 more
We present an analysis of the correlation between the mid-UV Mg II h and k emission lines and measured rotational periods of G-type stars. Based on IUE and HST high resolution spectra of a sample of 36 stars, we derive an exponential function that best represents the correlation. We found that the variation of the Mg II h + k fluxes is about a fac…
Differential asteroseismic study of seismic twins observed by CoRoT. Comparison of HD 175272 with HD 181420
Auvergne, M.; Baudin, F.; García, R. A. +13 more
Context. The CoRoT short asteroseismic runs give us the opportunity to observe a large variety of late-type stars through their solar-like oscillations. We report the observation and modeling of the F5V star HD 175272.
Aims: Our aim is to define a method for extracting as much information as possible from a noisy oscillation spectrum.
Me…
Generation mechanism of the whistler-mode waves in the plasma sheet prior to magnetic reconnection
Dandouras, I.; Santolík, O.; Rème, H. +6 more
The whistler-mode waves and electron temperature anisotropy play a key role prior to and during magnetic reconnection. On August 21, 2002, the Cluster spacecrafts encountered a quasi-collisionless magnetic reconnection event when they crossed the plasma sheet. Prior to the southward turning of magnetospheric magnetic field and high speed ion flow,…
Large-scale mapping of the massive star-forming region RCW38 in the [CII] and PAH emission
Nakagawa, T.; Ojha, D. K.; Fukui, Y. +10 more
Aims: We investigate the large-scale structure of the interstellar medium (ISM) around the massive star cluster RCW 38 in the [CII] 158 µm line and polycyclic aromatic hydrocarbon (PAH) emission.
Methods: We carried out [CII] line mapping of an area of ~30' × 15' for RCW 38 by a Fabry-Perot spectrometer on a 100 cm balloon-borne te…
Correction to "Pc2 EMIC waves generated high off the equator in the dayside outer magnetosphere"
Dandouras, I.; Kistler, L. M.; Zhang, J. -C. +3 more
On-Orbit Sensitivity Evolution of the EUV Imaging Spectrometer on Hinode
Mariska, J. T.
Since its launch on 22 September 2006, the EUV Imaging Spectrometer onboard the Hinode satellite has exhibited a gradual decay in sensitivity. Using spectroheliograms taken in the Fe VIII 185.21 Å and Si VII 275.35 Å emission lines in quiet regions near Sun center we characterize that decay. For the period from December 2006 to March 2012, the dec…
Reduced proton and alpha particle precipitations at Mars during solar wind pressure pulses: Mars Express results
Barabash, S.; Nilsson, H.; Stenberg, G. +2 more
We performed a statistical study of downward moving protons and alpha particles of ~keV energy (assumed to be of solar wind origin) inside the Martian induced magnetosphere from July 2006 to July 2010. Ion and electron data are from the Analyzer of Space Plasma and Energetic Atoms (ASPERA-3) package on board Mars Express. We investigated the solar…