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IMF dependence of the open-closed field line boundary in Saturn's ionosphere, and its relation to the UV auroral oval observed by the Hubble Space Telescope
Alexeev, I. I.; Belenkaya, E. S.; Badman, S. V. +4 more
We study the dependence of Saturn's magnetospheric magnetic field structure on the interplanetary magnetic field (IMF), together with the corresponding variations of the open-closed field line boundary in the ionosphere. Specifically we investigate the interval from 8 to 30 January 2004, when UV images of Saturn's southern aurora were obtained by …
AKARI Far-Infrared Source Counts in the Lockman Hole
Pearson, C. P.; Takagi, T.; Jeong, W. -S. +8 more
We report initial results of far-infrared observations of the Lockman Hole with Far-Infrared Surveyor onboard the AKARI infrared satellite. On the basis of slow-scan observations of a 0°.6 × 1°.2 contiguous area, we obtained source number counts at 65, 90, and 140 µm counts above 26 mJy account for about 7% of the cosmic background. These re…
Tectonic evolution of the eastern margin of the Thaumasia Plateau (Mars) as inferred from detailed structural mapping and analysis
Di Achille, G.; Ori, G. G.; Borraccini, F. +1 more
The eastern margin of the Thaumasia Plateau (EMTP) is characterized by a diversity of tectonic features, which recorded its complex, and still controversial, tectonic history. A detailed structural survey and analyses have been carried out in order to assess the kinematics and relative age of the main deformational events. Combining results from s…
Quantifying the effect of finite field-of-view size on radiative transfer calculations of Titan's limb spectra measured by Cassini-CIRS
Irwin, P. G. J.; Teanby, N. A.
The Composite InfraRed Spectrometer (CIRS) on-board the Cassini spacecraft has currently returned around three years worth of data from Saturn's largest moon Titan. One of the unique aspects of CIRS is to take high spatial resolution spectra of the limb of Titan, with sub-scale height (20–40 km) resolutions. This is made possible by the small fiel…
Internal structure and spatial dimensions of whistler wave regions in the magnetopause boundary layer
Lundin, R.; André, M.; Stenberg, G. +9 more
We use whistler waves observed close to the magnetopause as an instrument to investigate the internal structure of the magnetopause-magnetosheath boundary layer. We find that this region is characterized by tube-like structures with dimensions less than or comparable with an ion inertial length in the direction perpendicular to the ambient magneti…
The XMM-Newton survey in the Marano field. I. The X-ray data and optical follow-up
Hasinger, G.; Mignoli, M.; Zamorani, G. +6 more
We report on a medium deep XMM-Newton survey of the Marano Field and optical follow-up observations. The mosaicked XMM-Newton pointings in this optical quasar survey field cover 0.6 deg2 with a total of 120 ks good observation time. We detected 328 X-ray sources in total. The turnover flux of our sample is fX∼ 5 × 10-15<…
Analysis of power spectra of Doppler shift time series as a diagnostic tool for quiescent coronal loops
Doyle, J. G.; Erdélyi, R.; Bradshaw, S. J. +1 more
Context: Analysing the structure of solar coronal loops is crucial to our understanding of the processes which heat and maintain the coronal plasma at multimillion degree temperatures. The determination of the physical parameters of the loops remains both an observational and theoretical challenge.
Aims: The present work is aimed at tackling s…
Nickel Isotopic Composition and Nickel/Iron Ratio in the Solar Wind: Results from SOHO/CELIAS/MTOF
Wurz, P.; Bochsler, P.; Ipavich, F. M. +3 more
Using the Mass Time-of-Flight Spectrometer (MTOF)—part of the Charge, Elements, Isotope Analysis System (CELIAS)—onboard the Solar Heliospheric Observatory (SOHO) spacecraft, we derive the nickel isotopic composition for the isotopes with mass 58, 60 and 62 in the solar wind. In addition we measure the elemental abundance ratio of nickel to iron. …
Helicity Patterns of the Active Regions Connected by Transequatorial Loops
Zhang, Hongqi; Chen, Jie; Bao, Shudong
Using photospheric vector magnetograms of the Huairou Solar Observing Station and coronal X-ray images from the Yohkoh Soft X-Ray Telescope, we calculate the helicity patterns of 43 pairs of active regions and the chirality of 50 pairs of opposite magnetic polarity regions that are connected by transequatorial loops (TLs). To make the results more…
Eta Carinae across the 2003.5 Minimum: Deciphering the Spectrum toward Weigelt D
Gull, T. R.; Nielsen, K. E.; Ivarsson, S.
Hubble Space Telescope Space Telescope Imaging Spectrograph (HST STIS) near-ultraviolet (NUV) echelle spectra reveal complex structure in the sight line toward the Weigelt D condensation located 0.25" north-northwest of η Car. In previous studies, the Weigelt condensations have been described to exhibit pure emission line spectra dominated by tran…