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11.
I. Y. Grigoryeva V. N. Borovik M. A. Livshits V. E. Abramov-Maximov L. V. Opeikina V. M. Bogod A. N. Korzhavin 《Solar physics》2009,260(1):157-175
A CME/flare event occurred at the eastern limb on 25 January, 2007. Seven successive multi-wavelength scans in the range 1.8 cm?–?5.0 cm were obtained with the RATAN-600 radio telescope starting just at the beginning of the post-eruptive arcade formation (30 min after a C6.3 flare peak) and lasting for 3.5 hours. The conditions were favorable to study the off-limb microwave radio source associated with the post-eruptive arcade in different phases of its formation. Microwave radio emission of the arcade was rather intense initially and then considerably decreased; its maximum was co-spatial with the 195 Å Fe xii loop tops. The RATAN-600 total flux spectra of the off-limb radio source were practically flat during the first two hours indicating a predominant contribution of thermal emission. The X-ray spectrum was thermal (according to RHESSI data) at that time. Data available in the meter wavelength range during this phase were indicative of weak non-thermal processes likely due to accelerated particles. However, free?–?free emission of an isothermal source dominated in microwaves. This is indicative of the presence of a large amount of plasma in the region of arcade formation at the initial stage of the event. The weak microwave emission during the decay phase might be interpreted as the thermal cyclotron emission of the loops in the arcade. 相似文献
12.
The detailed measurements of Call K line profiles along a diameter of the solar disk are presented. The obtained limb-darkening curves are used to test three semi-empirical models for the quiet Sun assuming moderate resolution. The calculations were carried out using the non-LTE code MULTI, taking into account a partial frequency redistribution. A comparative analysis of the measured and computed curves shows that the behavior of the Call K profiles from the center to the limb is sensitive to the temperature distributions of the semi-empirical models. The SRPM 305 model published by Fontenla et al. (2007) best reproduces the observed limb darkening in the region from the photosphere to the lower chromosphere; however, the agreement of this model with the observations at the line center is worse than for the other models, since this model was not assigned to describe hot chromospheric layers. 相似文献
13.
N. I. Grigoryeva 《Russian Meteorology and Hydrology》2017,42(11):717-722
The seasonal distribution of hypoxia in the bottom waters of the Eastern Bosporus (the Peter the Great Gulf, the Sea of Japan) is analyzed based on long-term observational data (2006-2013). It is revealed that in summer the monthly mean concentration of oxygen in the bottom waters considerably decreased as compared to average long-term data. The minimum values of oxygen concentration were registered during four months, from July to October. It is demonstrated that the small values of oxygen concentration are mainly caused by the inflow of hypoxic water from the Amur Bay. 相似文献
14.
N. I. Grigoryeva 《Oceanology》2009,49(5):663-671
The analysis of the data obtained during the plankton surveys in Possyet Bay (Peter the Great Bay of the Sea of Japan) in
2000–2001 is presented. The larvae of eight crab species were registered in the plankton: the red king crab Paralithodes camtschaticus (Tilesius, 1815), the snow (opilio) crab Chionoecetes opilio (Fabricius, 1780), the Arctic lyre crab Hyas coarctatus ursinus (Leach, 1815), the kelp crab Pugettia quadridens (de Haan, 1839), the helmet crab Telmessus cheiragonus (Tilesius, 1815), the Japanese swimming crab Charybdis japonica (A. Milne-Edwards, 1861), the pea crab Pinnixa rathbuni (Sakai, 1934), and the porcelain crab Pachycheles stevensii (Stimpson, 1858). These species belonged to six families: Lithodidae, Atelecyclidae, Majidae, Portunidae, Porcellanidae,
and Pinnotheridae. The role of the variability of some of the hydrological factors in the meroplankton larvae development
was studied. In May, the crab larvae were found mostly in the open part of the bay. In June, they were transported by the
current to the northern part of the bay. In July, they spread uniformly in all the bay areas; however, patchiness was observed.
The maximal population density of the crab larvae was registered for July and varied from 6.8 to 23.3 ind. m−3. The crab larvae appeared in the plankton in 2000 and 2001 earlier than for the average season. 相似文献
15.
16.
N. I. Grigoryeva 《Water Resources》2018,45(1):98-103
Observations of 2006–2013 were used to characterize water in the Eastern Bosporus Strait (Peter the Great Gulf, the Sea of Japan) by dissolved oxygen concentration and its biochemical demand. The mean monthly concentrations of oxygen in bottom water layer were found to have decreased considerably compared with the mean values in 1981–1985, and its minimal values were observed within four months—from July to October. The low oxygen concentrations in summer were found to be due mostly to oxygen-deficient water from Amursky Bay. 相似文献
17.
Water Resources - Studies of 2015 were used to characterize water in Vostok Bay (Peter the Great Gulf, the Sea of Japan) in terms of phosphate concentration, biochemical oxygen demand, and pH. The... 相似文献
18.
Oceanology - Nowadays cyanobacterial blooms in open reservoirs and estuaries became one of the most important ecological problem. The optimal way to solve this problem is to develop innovative... 相似文献
19.
The line profile inversion is as a rule used to model the atmosphere. The algorithm for determining the temperature and electron
density in the middle chromosphere has been developed based on inversion of the profiles of five Ca II chromospheric lines.
Necessary information is contained in the function called by us the population function. This function is used to calculate
the frequency-dependent source functions in lines and, consequently, the rates of radiative transitions. However, the accuracy
of population function reconstruction in the inversion procedure is insufficient for the goal to be achieved. The accuracy
is increased by using the intensity response function conception. The response functions of five Ca II lines to the population
function disturbances have been calculated. The accuracy to be achieved has been estimated using one of the semiempirical
models of the sunspot umbra as an example. 相似文献
20.
It is difficult to numerically solve steady-state equations for calcium, which are used to determine temperature and electron
density in a sunspot umbra chromosphere. As a result, the coefficients of equations, obtained using inversion of the measured
profiles of five Ca II lines, are to a certain degree uncertain. Never-theless, these insignificant uncertainties do not make
it possible to consider that a unique solution of the set of equations, found using classical methods, is sufficiently reliable.
Reasonable restrictions on desired variables are presented, which makes it possible to sufficiently accurately restore temperature
variations in the specified (test) model of a sunspot umbra. Temperature variations in the studied region of the chromosphere
are restored to an average relative error of ±14%. 相似文献