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On the small-scale turbulence parameters in the atmosphere of venus and their use in the global circulation models
Izakov, M. N.
Vertical profiles of the turbulence parameters calculated for the planet-averaged conditions from the experimental data on the turbulent fluctuations of temperature and wind velocity are presented. Improved formulas accounting for the difference between the atmospheric gas on Venus and an ideal one, and the large difference in its thermal capacity…
Accurate positions for the ultraluminous X-ray sources NGC 7319-X4 and NGC 5474-X1 and limiting magnitudes for their optical counterparts
Torres, M. A. P.; Heida, M.; Jonker, P. G. +1 more
In this paper, we report accurate Chandra positions for two ultraluminous X-ray sources (ULXs): NGC 7319-X4 at Right Ascension (RA) = 339?029 17(2), Declination (Dec.) = 33?974 76(2) and NGC 5474-X1 at RA = 211?248 59(3), Dec. = 53?635 84(3). We perform bore-sight corrections on the Chandra X-ray satellite observations of these sources to get thes…
Martian ionogram scaling by the Object Tracking Method
Ping, JinSong; Wang, MingYuan
The Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS) onboard the Mars Express (MEX) spacecraft started to collect data of the Martian topside ionosphere from May, 2005. By now a large amount of ionograms has been obtained. It is important to extract vertical ionospheric information effectively from the ionograms for further stud…
Are Decaying Magnetic Fields Above Active Regions Related to Coronal Mass Ejection Onset?
Li, Y.; Welsch, B. T.; Suzuki, J.
Coronal mass ejections (CMEs) are powered by magnetic energy stored in non-potential (current-carrying) coronal magnetic fields, with the pre-CME field in balance between outward magnetic pressure of the proto-ejecta and inward magnetic tension from overlying fields that confine the proto-ejecta. In studies of global potential (current-free) model…
A first principle approach for clover detector
Kshetri, R.
A simple model based on probability flow arguments has been presented for understanding the clover germanium detector. Using basic concepts of absorption and scattering of gamma-rays, the operation of the clover detector has been described in terms of six probability amplitudes and a parameter. Instead of using an empirical method or simulation, t…
Solar Wind-Comet Exosphere Interaction. 2. Could the Single-Fluid Gas-Dynamic Model be Applicable to the Rosetta Mission
Dryer, M.; Kartalev, M.; Dobreva, P. +1 more
The capabilities of a single fluid gasdynamic model of solar wind-comet exosphere interaction, presented in the accompanying (Keremidarska et al.) [23], are discussed from the point of view of its potential implementation in interpreting data, expected to be obtained by ROSETTA mission instruments in plasma environments of the comet 67P/Churyumov-…
Synoptic magnetic field in cycle 23 and in the beginning of the cycle 24
Benevolenskaya, E. E.; Ponyavin, Yu. D.
The SOHO/MDI data provide the uniform time series of the synoptic magnetic maps which cover the period of the cycle 23 and the beginning of the cycle 24. It is very interesting period because of the long and deep solar minimum between the cycles 23 and 24. Synoptic structure of the solar magnetic field shows variability during solar cycles. It is …
On the surface structure of sunspots
Franz, M.
A precise knowledge of the surface structure of sunspots is essential to construct adequate input models for helioseismic inversion tools. % and to gain information about the subsurface structure of sunspots. We summarize our recent findings about the velocity and magnetic field in and around sunspots using HINODE observation. To this end we quant…
Isolated Sunspot with a Dark Patch in the Coronal Emission
Shibasaki, K.; Ryabov, B. I.; Bezrukov, D. A.
On the base of the 17 GHz radio maps of the Sun taken with the Nobeyama Radio Heliograph we estimate plasma parameters in the specific region of the sunspot atmosphere in the active region AR 11312. This region of the sunspot atmosphere is characterized by the depletion in coronal emission (soft X-ray and EUV lines) and the reduced absorption in t…
Field-Aligned Electrons in Polar Region Observed by Cluster on 30 September 2001
Shi, Jian-Kui; Cheng, Zheng-Wei; Zhang, Zi-Ying +1 more
The physical process in the Earth's polar region is very complex and still needs to be further studied. Using the data from Cluster satellite measurement, an analysis on field-aligned electrons in the mid-latitude cusp on 30 September 2001 has been performed. The satellite observed a down-flowing electron event in the low-latitude boundary and a s…