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The Cassini Enceladus encounters 2005-2010 in the view of energetic electron measurements
Krupp, N.; Jones, G. H.; Roussos, E. +8 more
The moon Enceladus, embedded in Saturn’s radiation belts, is the main internal source of neutral and charged particles in the Kronian magnetosphere. A plume of water ice molecules and dust released through geysers on the south polar region provides enough material to feed the E-ring and also the neutral torus of Saturn and the entire magnetosphere…
Temperature and grain size dependence of near-IR spectral signature of crystalline water ice: From lab experiments to Enceladus' south pole
Le Mouélic, Stéphane; Taffin, Cécile; Grasset, Olivier +3 more
An experimental facility has been set up to acquire infrared spectra of pure water ices with controlled grain sizes ranging from 80 to 700 µm and temperatures ranging from 80 to 140 K at 10-2 mbar. Forty-seven near IR spectra (1.0-5.0 µm), selected among the total acquired spectra, permit us to determine how spectral charact…
Broadband analysis techniques for Herschel/HIFI spectral surveys of chemically rich star-forming regions
Bergin, Edwin A.; Lis, Dariusz C.; Phillips, Thomas G. +3 more
The Heterodyne Instrument for the Far Infrared (HIFI) aboard the Herschel Space Observatory has acquired high-resolution broadband molecular spectra of star-forming regions in a wavelength range that is mostly inaccessible from ground-based astronomical observatories. These spectral surveys provide new insight into the chemical composition and phy…
Is there long-range memory in solar activity on timescales shorter than the sunspot period?
Rypdal, M.; Rypdal, K.
The sunspot number (SSN), the total solar irradiance (TSI), a TSI reconstruction, and the solar flare index (SFI) are analyzed for long-range persistence (LRP). Standard Hurst analysis yields H ≈ 0.9, which suggests strong LRP. However, solar activity time series are nonstationary because of the almost-periodic 11 year smooth component, and the an…
On the Nature of the Hot Component in the Symbiotic, Supersoft X-Ray Binary AG Draconis
Sion, Edward M.; Godon, Patrick; Mikolajewska, Joanna +2 more
AG Dra is a symbiotic variable consisting of a metal-poor, yellow giant mass donor underfilling its Roche lobe and a hot accreting white dwarf, possibly surrounded by an optically thick, bright accretion disk (which could be present from wind accretion). We constructed NLTE synthetic spectral models for white dwarf spectra and optically thick accr…
Accelerated magnetosheath flows caused by IMF draping: Dependence on latitude
Farrugia, C. J.; Erkaev, N. V.; Torbert, R. B. +2 more
In previous work we used a semi-analytical treatment to describe accelerated magnetosheath flows caused by the draping of interplanetary magnetic field (IMF) lines around the magnetosphere. Here, we use the same approach, i.e., modeling the magnetic field lines as elastic strings, to examine how the magnetic tension force, one of the two agents re…
Upper limits on the high-energy emission from gamma-ray bursts observed by AGILE-GRID
Antonelli, L. A.; Costa, E.; Mereghetti, S. +60 more
Context. The detection and the characterization of the highenergy emission component from individual gamma-ray bursts (GRBs) is one of the key science objectives of the currently operating gamma-ray satellite AGILE, launched in April 2007. In its first two years of operation AGILE detected three GRBs with photons of energy larger than 30 MeV. One …
Testing three derivative methods of stellar population synthesis models
Han, Zhanwen; Zhang, Yu; Liu, Jinzhong +2 more
The number of methods used to study the properties of galaxies is increasing, and it is very important to test these methods. Galactic globular clusters (GCs) provide an excellent medium for such tests, because they can be considered as simple stellar populations. We present ages and metallicities for 40 Galactic GCs as determined from three publi…
On the cooling trend of SGR 0526-66
Göǧüş, Ersin; Güver, Tolga; Özel, Feryal
We present a systematic analysis of all archival Chandra observations of the soft gamma repeater SGR 0526-66. Our results show that the X-ray flux of SGR 0526-66 decayed by about 20 per cent between 2000 and 2009. We employ physically motivated X-ray spectral models and determine the effective temperature and the strength of the magnetic field at …
Horizontal flow fields observed in Hinode G-band images. III. The decay of a satellite sunspot and the role of magnetic flux removal in flaring
Verma, M.; Denker, C.
Context. Emergence of magnetic flux plays an important role in the initiation of flares. However, the role of submerging magnetic flux in prompting flares is more ambiguous, not the least because of the scarcity of observations.
Aims: The flare-prolific active region NOAA 10930 offered both a developing δ-spot and a decaying satellite sunspot…