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Kim I. S. Krusanova N. L. Popov V. V. Osokin A. R. Mironova I. V. 《Geomagnetism and Aeronomy》2020,60(4):441-445
Geomagnetism and Aeronomy - The color of the coronal continuum was determined from observations in order to search for manifestations of coronal expansion. A brief review of studies determining the... 相似文献
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I. S. Kim I. V. Alekseeva I. V. Mironova A. R. Osokin V. V. Popov E. Z. Suyunova 《Geomagnetism and Aeronomy》2016,56(8):993-997
According to measurements of the magnetic fields in quiescent prominences carried out by different teams in 1964–1989, the maximum values of the field correspond to the minimum values of the Wolf numbers averaged through the corresponding periods of observations. It has been shown that the synoptic noneclipse 2D linear polarimetry of quiescent Hα-prominences can be actually implemented; this method is based on the use of a coronagraph with a primary-optics diameter equal to or larger than 100 mm, a narrow-band filter with FWHM ≤ 0.4 nm, a standard linear polariod, and a high-precision linear polarimetric technique. 相似文献
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The results of mass balance observations of the ice dome and measurements of the active layer thickness on the Fildes Peninsula, King George (Waterloo) Island, Western Antarctica are presented for the period of 2007 to 2019. The dynamics of the main meteorological parameters affecting the active layer thickness is determined. The numerical experiments based on the mathematical model are performed to determine the effects of various parameters on the active layer thickness. The calculated and measured values of the active layer thickness are compared. The thermal instability of permafrost in the study area in some years with high (above the means) summer air temperature is demonstrated. The climate cooling which started in the region in the recent years has increased the number of years with the positive ice mass balance. However, the positive ice mass balance has not yet become a dominant factor against a background of the negative balance in the previous years. 相似文献
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We propose a new two-dimensional self-organized critical model of eruption process based on the concept of magnetic elements.
Solar flares are considered as avalanches of annihilations of magnetic elements. This approach allows to describe eruptive
processes in the solar atmosphere in the physically clear manner and easily simulate their basic properties. The model proposed
yields a power law distribution of flare energy in a good agreement with observations. One can also expand the model to take
into account new factors and ideas.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
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Measurements of the linear polarization degree (p) of the emission in the inner corona (<1.5 R ⊙) in the green and red continuum ranges are discussed. “Excess p” (Δp = pgreen — pred), which reaches its maximum at 1.2–1.3 R ⊙ (<5%) in the polar regions and 20% within large-scale streamers, is present everywhere in the corona. It has been mentioned that excess p can be explained by the presence of neutral hydrogen in the corona. 相似文献
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Kim I. S. Alexeeva I. V. Suyunova E. Z. Popov V. V. Osokin A. R. Mironova I. V. 《Geomagnetism and Aeronomy》2018,58(8):1073-1080
Geomagnetism and Aeronomy - A brief comparative analysis determining the magnetic field in optical and radio range prominences is presented; a tendency to increase averaged magnetic fields two to... 相似文献
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This work continues earlier statistical analyses of catalogued proton events in cosmic rays. The spectra of proton enhancements identified from the logarithm of the ratio of the proton fluxes with energies exceeding 100 and 10 MeV, δ = log(F 100/F 10), are studied focusing on 172 powerful events with favorable conditions for escaping from the corona and subsequent propagation in the interplanetary space. The δ distribution for the flares is Gaussian, with a comparatively weak spread in δ. The distribution maximum corresponds to an excess of the 10 MeV flux over the 100 MeV flux by a factor of 30. The fact such a frequent spectrum does exist supports the idea that both soft and hard protons are efficiently accelerated, probably by a single mechanism that operates during the explosive phases of the flares. The sizes of the loops of M2-X4 flares observed by the Yohkoh Hard X-Ray Telescope at energies exceeding 50 keV indicate low heights for the main acceleration regions. There is some excess over the Gaussian distribution for “softer” events. Some post-eruptive phenomena can be clearly distinguished in these events, and they display a correlation between δ and the total flare duration. Thus, there are two sources of the particle acceleration operating at low and high altitudes during the explosive and post-eruptive phases of the solar flares, respectively. The second source, which is manifested through some prolonged flares and filament-ejection phenomena, accelerates protons only to energies of 10–30 MeV. 相似文献
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Factors that could produce the statistical relationship observed between the duration of transient processes on the Sun and the power of corresponding disturbances of the interplanetary medium are investigated. Uniform data on the soft X-radiation of more than 50000 flares made it possible to study their number distribution according to duration in four ranges of event power. It proved possible to identify three event types: impulse flares of a total duration of less than 30 min, typical (two-ribbon) flares of less than one to two hours' duration, and very prolonged events, which include phenomena in activity complexes and dynamical flares. These results are in good agreement with the expected phenomena durations, which were determined from the energy balance in the flare source of the soft X-radiation. In particular, while there is a free leakage of the generated hot plasma in impulse flares, heating near a coronal-loop apex becomes significant in two-ribbon flares and determines the entire process in prolonged flares. A comparison of the data on soft and hard X-rays demonstrated that fairly powerful impulses are as a rule followed by the formation of a coronal-loop system. This process of the formation of a flare-loop system often generates a shock wave, which gives rise to coronal mass ejections (CMEs). The possibility is discussed that, in the most prolonged flares, CMEs often lead to new flare formations, the ejection of material from coronal levels continuing and increasing disturbances in interplanetary space for a lengthy period of time. 相似文献
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A method for the compilation of 1:3,000,000-scale maps of natural nival-glacial phenomena is proposed for an area of the High Pamir Range in Soviet Central Asia. Such maps depict the distribution, frequency and intensity/magnitude, and potential impacts of such natural hazards as avalanches, mudslides, “dirty snow” avalanches (combined avalanches-mudslides in late spring), icings (naledy), and glacier pulsations, and are used in the planning of construction and the maintenance of roads and other transportation corridors during winter and spring. Hypothetical examples of the use of the maps are provided. Translated from: Materialy glyatsiologicheskikh issledovanly, USSR Geophysical Committee Publication No. 55. Moscow: Mezhduvedomstvenniy geofizicheskiy komitet, 1986, pp. 213–219. 相似文献
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