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.

2019, Kovylyaeva, A. A., 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

© Published under licence by IOP Publishing Ltd. The flux of cosmic rays passing through the heliosphere changes its characteristics (energy and angular distribution) due to the influence of the interplanetary magnetic field. Because of this, the muon flux produced by primary cosmic rays in the Earth atmosphere also changes its characteristics. Muons registered at the surface of the Earth are generated mainly by primary protons and helium nuclei with energies from 10 GeV to TeV. The trajectories of these particles in the heliosphere are significantly influenced by the interplanetary magnetic field. The construction of backward trajectories of particles from the Earth surface (detector) into the heliosphere region allows us to estimate the relationship between the trajectories of muons and primary particles. The trajectories of muons and parent protons and helium nuclei of various energies for positive and negative polarity of the Sun in a quiet period and under the influence of disturbances in the interplanetary magnetic field are presented. It is shown that the change in the polarity of the Sun and the influence of disturbances in the interplanetary magnetic field lead to qualitative changes in the regions of the heliosphere through which primary particles pass.

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.

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.

2019, Gvishiani, A. D., Getmanov, V. G., Dobrovolsky, M. N., Sidorov, R. V., 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.A method for elimination of periodical diurnal, annual, and 27-day and 11-year solar variations in the matrix observations of the URAGAN muon hodoscope was developed. The analysis of the parameters of these variations in the time and frequency domains was performed. Two-dimensional bandpass filtering of sequences of muon hodoscope matrix observations was implemented. The structure of a two-dimensional filter is developed, based on the operation of elementwise matrix multiplications and additions. Examples of eliminating variations in the URAGAN muon hodoscope matrix observations are discussed.

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.

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.

2019, Astapov, I. I., Barbashina, N. S., Dmitrieva, A. N., Melnikova, I. A., Osetrova, N. V., Shutenko, V. V., Yashin, I. I., Астапов, Иван Иванович, Барбашина, Наталья Сергеевна, Дмитриева, Анна Николаевна, Шутенко, Виктор Викторович, Яшин, Игорь Иванович

© Published under licence by IOP Publishing Ltd.Coronal mass ejections (CME) have an impact on the flux of cosmic rays that penetrate the disturbed areas in the heliosphere and the near-terrestrial space. Unlike most ground-based cosmic ray detectors, the URAGAN muon hodoscope (MEPhI) allows to investigate both the integrated counting rate of registered particles and angular characteristics of the muon flux at the ground level. To select the local areas with statistically significant intensity changes, the angular distributions for the last hour and preceding it 24 hours corrected for the barometric effect are used. Angular distributions are smoothed, and the matrix of relative changes of the angular distribution in units of statistical errors is formed. The use of asymptotic directions calculated in advance, the angular cells of the matrix are mapped from the local coordinate system to the GSE coordinate system. The results of the study of GSE-mapping of local deformations of the angular distributions for different types of CMEs are discussed.

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.

2019, Konovalova, A. Y., Astapov, I. I., Barbashina, N. S., Osetrova, N. V., Mishutina, Y. N., Shutenko, V. V., Yashin, I. I., Коновалова, Алена Юрьевна, Астапов, Иван Иванович, Барбашина, Наталья Сергеевна, Мишутина, Юлия Николаевна, Шутенко, Виктор Викторович, Яшин, Игорь Иванович

© 2019, Pleiades Publishing, Ltd.The influence of a high-speed solar wind on the state of magnetosphere, as well as on the cosmic ray flux registered on the Earth’s surface by the muon hodoscope URAGAN (MEPhI) is discussed. The results of the analysis of the parameters of muon flux local anisotropy in the periods of low solar activity (2008–2009 and 2017–2018) during geomagnetic disturbances caused by the high-speed solar wind are presented.