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Дмитриева, Анна Николаевна

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Организационные подразделения

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Цель ИЯФиТ и стратегия развития - создание и развитие научно-образовательного центра мирового уровня в области ядерной физики и технологий, радиационного материаловедения, физики элементарных частиц, астрофизики и космофизики.

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Дмитриева

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Анна Николаевна

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Теперь показываю 1 - 10 из 22

Только метаданные
Invesigation of the Local Anisotropy of Cosmic Ray Muon Flux During Coronal Mass Ejections in 2007–2018
(2019) Astapov, I. I.; Barbashina, N. S.; Dmitrieva, A. N.; Konovalova, A. Y.; Osetrova, N. V.; Shutenko, V. V.; Yashin, I. I.; Астапов, Иван Иванович; Барбашина, Наталья Сергеевна; Дмитриева, Анна Николаевна; Коновалова, Алена Юрьевна; Шутенко, Виктор Викторович; Яшин, Игорь Иванович
© 2019, Pleiades Publishing, Ltd.Coronal mass ejections are among the most powerful disturbances of the interplanetary space. They can influence the state of the near-Earth space, including magnetosphere of the Earth. In addition, such disturbances modulate the flux of cosmic rays and penetrate both the heliosphere and the Earth’s magnetosphere. In order to find an early alert of such events, it is necessary to investigate the flux of particles arriving to the Earth and providing information about events in the heliosphere. The paper presents the results of investigation of the anisotropy of the cosmic ray muon flux by means of the muon hodoscope URAGAN in the period from 2007 to 2018.
Только метаданные
Two-Dimensional Filtering Method Using Systems of Local Model Functions for Muonogram Analysis
(2020) Getmanov, V. G.; Sidorov, R. V.; Dobrovolsky, M. N.; Perederin, F. V.; Yashin, I. I.; Dmitrieva, A. N.; Яшин, Игорь Иванович; Дмитриева, Анна Николаевна
© 2020, Pleiades Publishing, Ltd.Abstract: A two-dimensional filtering method, based on the construction of systems of approximating sliding local model functions with their subsequent weighted averaging, is proposed. A two-dimensional filtering algorithm based on the summation of approximating sliding piecewise-linear model functions with weight coefficients is developed. Optimization of the parameters of the filtering algorithm is considered. The results of testing the filtering algorithm and calculating its optimal parameters on model muonograms are presented. A comparative estimation of the algorithm’s errors is made. An example of testing the developed method of two-dimensional filtering on an experimental muonogram is presented; the results of the muonogram’s analysis are described.
Только метаданные
Real-Time GSE Mapping of Muon-Flux Directional Variation with the URAGAN Hodoscope
(2019) Yashin, I. I.; Astapov, I. I.; Barbashina, N. S.; Dmitrieva, A. N.; Kompaniets, K. G.; Petrukhin, A. A.; Shutenko, V. V.; Яшин, Игорь Иванович; Астапов, Иван Иванович; Барбашина, Наталья Сергеевна; Дмитриева, Анна Николаевна; Компаниец, Константин Георгиевич; Петрухин, Анатолий Афанасьевич; Шутенко, Виктор Викторович
© 2019, Allerton Press, Inc.Abstract: Continuous monitoring of the muon flux over wide ranges of zenith and azimuth angles with the URAGAN detector (Moscow, 55.7° N, 37.7° E, 173 m AMSL) allows detection of variations in its intensity and angular distribution. A way of locating domains of anisotropy in the muon angular distribution is described, and they are mapped in matrix form in the GSE coordinate system. The maximum depth (height) of deformation, the zenith and azimuth angles of the center in the local system, and its GSE longitude and latitude are determined for each observed domain. The GSE longitudes of the detected domains of anisotropy are available on the Internet as functions of time and can be used to monitor the heliosphere’s activity.
Только метаданные
A Way of Detecting Local Muon-Flux Anisotropies with the Matrix-Form Data of the URAGAN Hodoscope
(2019) Dobrovolsky, M. N.; Gvishiani, A. D.; Getmanov, V. G.; Peregoudov, D. V.; Astapov, I. I.; Barbashina, N. S.; Dmitrieva, A. N.; Kovilyaeva, A. A.; Petrukhin, A. A.; Shutenko, V. V.; Yashin, I. I.; Астапов, Иван Иванович; Барбашина, Наталья Сергеевна; Дмитриева, Анна Николаевна; Петрухин, Анатолий Афанасьевич; Шутенко, Виктор Викторович; Яшин, Игорь Иванович
© 2019, Allerton Press, Inc.Abstract: A way of detecting local anisotropies of the muon flux using the matrix-form data of the URAGAN hodoscope (MEPhI) is proposed. Confidence intervals for estimating the matrix-data mathematical expectations in observations with reference and sliding data-sampling periods are selected, indicator functions are constructed, and a procedure for space–time filtering is developed. The results are presented from a search for local anisotropy in the muon flux recorded in the matrix-form data of the URAGAN hodoscope.
Только метаданные
Investigating Characteristics of Forbush Effects Recorded by the URAGAN Muon Hodoscope in the Period 2012–2017
(2019) Kovylyaeva, A. A.; Astapov, I. I.; Barbashina, N. S.; Borog, V. V.; Dmitrieva, A. N.; Kompaniets, K. G.; Mishutina, Y. N.; Petrukhin, A. A.; Shutenko, V. V.; Yakovleva, E. I.; Yashin, I. I.; Астапов, Иван Иванович; Барбашина, Наталья Сергеевна; Борог, Владимир Викторович; Дмитриева, Анна Николаевна; Компаниец, Константин Георгиевич; Мишутина, Юлия Николаевна; Петрухин, Анатолий Афанасьевич; Шутенко, Виктор Викторович; Яшин, Игорь Иванович
© 2019, Allerton Press, Inc.Abstract: Results are presented from an analysis of changes in the muon flux of cosmic rays during Forbush effects, recorded by the URAGAN muon hodoscope in the period 2012–2017 and the scintillation muon hodoscope in 2016–2017. Characteristics of the Forbush effects for this period are analyzed. The obtained characteristics of muon flux variations are compared to different parameters of the near heliosphere during the Forbush effects for the 11-year cycle of solar activity.
Только метаданные
Method for Eliminating Diurnal Variations in Muon Fluxes for Matrix Observations of the Uragan Hodoscope
(2019) Sidorov, R. V.; Gvishiani, A. D.; Getmanov, V. G.; Dobrovolsky, M. N.; Astapov, I. I.; Barbashina, N. S.; Dmitrieva, A. N.; Shutenko, V. V.; Yashin, I. I.; Астапов, Иван Иванович; Барбашина, Наталья Сергеевна; Дмитриева, Анна Николаевна; Шутенко, Виктор Викторович; Яшин, Игорь Иванович
© 2019, Allerton Press, Inc.Abstract: A way of eliminating diurnal variations in muon fluxes for matrix observations of the URAGAN hodoscope (MEPhI) is proposed, based on a matrix digital two-dimensional low-pass filter. Its structure is developed on the basis of matrix elementwise multiplications. Diurnal variations in the muon fluxes for the sequence of matrix observations of the Uragan hodoscope are eliminated.
Только метаданные
Study of Cross-Correlation between Information Matrixes of Observation of the URAGAN Hodoscope and Dst Index
(2019) Butirskiy, E. Y.; Chinkin, V. E.; Dobrovolsky, M. N.; Getmanov, V. G.; Astapov, I. I.; Dmitrieva, A. N.; Kovylyaeva, A. A.; Yashin, I. I.; Астапов, Иван Иванович; Дмитриева, Анна Николаевна; Яшин, Игорь Иванович
© 2019, Pleiades Publishing, Ltd.Cross-correlation between observation matrixes of the URAGAN muon hodoscope and the Dst index was studied. Functions of total intensity and anomaly were introduced. The results of calculations of cross-correlations on 2D diagrams were considered. It was shown that time periods with increased geomagnetic activity were almost always preceded by time periods with increased values of the modulus of the Pearson correlation coefficient.
Только метаданные
Forbush Decreases During 2007–2018 According to the Muon Hodoscope URAGAN Data
(2019) Kovylyaeva, A. A.; Astapov, I. I.; Barbashina, N. S.; Borog, V. V.; Dmitrieva, A. N.; Kompaniets, K. G.; Mishutina, Y. N.; Petrukhin, A. A.; Shutenko, V. V.; Yakovleva, E. I.; Yashin, I. I.; Астапов, Иван Иванович; Барбашина, Наталья Сергеевна; Борог, Владимир Викторович; Дмитриева, Анна Николаевна; Компаниец, Константин Георгиевич; Мишутина, Юлия Николаевна; Петрухин, Анатолий Афанасьевич; Шутенко, Виктор Викторович; Яшин, Игорь Иванович
© 2019, Pleiades Publishing, Ltd.Results of the study of variations of cosmic ray muon flux at the Earth surface during Forbush decreases registered in 2007–2018 by means of the muon hodoscope URAGAN are presented. The dynamics of the amplitude spectral index at different stages (the decrease, the minimum, and the recovery), which correspond to different phases of the influence of heliospheric disturbances on the flux of cosmic rays for the period 2012 to 2018, is considered. To investigate possible regularities in the behavior of the projection of the relative local anisotropy vector of the muon flux to the South and to the East (rS and rE) during 2007–2018, the distributions of these parameters for four phases (immediately before FD, decrease phase, minimum phase, recovery phase) were calculated.
Только метаданные
Method for the Identification of Heliospheric Anomalies Based on the Functions of the Characteristic Deviations for the Observation Matrices of the Muon Hodoscope
(2019) Chinkin, V. E.; Gvishiani, A. D.; Getmanov, V. G.; Dobrovolsky, M. N.; Astapov, I. I.; Dmitrieva, A. N.; Kovylyaeva, A. A.; Yashin, I. I.; Астапов, Иван Иванович; Дмитриева, Анна Николаевна; Яшин, Игорь Иванович
© 2019, Pleiades Publishing, Ltd.This paper presents a method for identifying heliospheric anomalies using the introduced function of characteristic deviations for the muon hodoscope matrices. The estimation of the averaged hardware function is considered. Spatial filtering is proposed to eliminate fluctuations in the functions of the characteristic deviations. An example of the implementation of the developed method using the example of the storm July 13, 2017. It is shown that for this event, the identified anomaly precedes by several hours a sharp increase in the Kp index.
Только метаданные
Modeling a Scintillation Hodoscope for Muonography
(2021) Anoshina, E. S.; Dmitrieva, A. N.; Shutenko, V. V.; Yakovleva, E. I.; Yashin, I. I.; Дмитриева, Анна Николаевна; Шутенко, Виктор Викторович; Яшин, Игорь Иванович
© 2021, Allerton Press, Inc.Abstract: A universal model is considered for a scintillation muon hodoscope (MH) to be used in the muonography of large objects. Muon tracks are registered by a multilayer assembly of narrow long scintillation strips with light collected by optical fibers on silicon photomultipliers. Characteristics of the scintillation MH are determined and its model in the Geant4 software package is described. The model strip’s parameters are calibrated on the basis of experimental data.