scholarly journals Interplanetary Magnetic Field Parameters Affecting Cosmic Ray Forbush Decrease

2019 ◽  
Author(s):  
Dr. M. L. Chauhan ◽  
Mahendra Kumar Richharia ◽  
Bk Soni
Keyword(s):  
Magnetic Field ◽  
Interplanetary Magnetic Field ◽  
Forbush Decrease ◽  
Cosmic Ray

scholarly journals Precursory signals of Forbush decreases with and without shock wave

2021 ◽  
pp. 57-63
Author(s):  
Dimitra Lingri ◽  
Helen Mavromichalaki ◽  
Anatoly V. Belov ◽  
Eugenia A. Eroshenko
Keyword(s):  
Magnetic Field ◽  
Shock Wave ◽  
Interplanetary Magnetic Field ◽  
Selection Criteria ◽  
Forbush Decrease ◽  
Cosmic Ray ◽  
Abrupt Increase ◽  
Cosmic Ray Intensity ◽  
Similarities And Differences ◽  
Solar Disturbances

Many previous studies have shown that before the beginning of a Forbush Decrease (FD) of the cosmic ray intensity, a precursor signal can be observed. All these surveys were focused on FDs that are associated with a sudden storm com- mencement (SSC). In this work we demonstrate that precursors could also be observed in events without a SSC that is determined by an abrupt increase of the interplanetary magnetic field. The type of precursory signals and their diversity among the events are the main purpose of this study. We try to figure out similarities and differences on the signals and the associated events from both categories in the last fifty years, from 1969 to 2019, using the same selection criteria of the under investigation FDs. Simultaneously the orientation of the upcoming solar disturbances in comparison to the way they configure the increase of the interplanetary magnetic field and create these signals are discussed.

scholarly journals Evaluation of the Interplanetary Magnetic Field Strength Using the Cosmic-Ray Shadow of the Sun

2018 ◽  
Vol 120 (3) ◽  
Author(s):  
M. Amenomori ◽  
X. J. Bi ◽  
D. Chen ◽  
T. L. Chen ◽  
W. Y. Chen ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Field Strength ◽  
Interplanetary Magnetic Field ◽  
Magnetic Field Strength ◽  
Cosmic Ray ◽  
The Sun

scholarly journals Kinematic models of the interplanetary magnetic field

2019 ◽  
Vol 37 (3) ◽  
pp. 299-314 ◽  
Author(s):  
Christoph Lhotka ◽  
Yasuhito Narita
Keyword(s):  
Magnetic Field ◽  
Interplanetary Magnetic Field ◽  
Current Knowledge ◽  
Cosmic Ray ◽  
Charged Dust ◽  
Cosmic Ray Modulation ◽  
Latitudinal Dependence ◽  
Magnetic Field Model ◽  
Kinematic Models ◽  
Turbulence Effect

Abstract. Current knowledge on the description of the interplanetary magnetic field is reviewed with an emphasis on the kinematic approach as well as the analytic expression. Starting with the Parker spiral field approach, further effects are incorporated into this fundamental magnetic field model, including the latitudinal dependence, the poleward component, the solar cycle dependence, and the polarity and tilt angle of the solar magnetic axis. Further extensions are discussed in view of the magnetohydrodynamic treatment, the turbulence effect, the pickup ions, and the stellar wind models. The models of the interplanetary magnetic field serve as a useful tool for theoretical studies, in particular on the problems of plasma turbulence evolution, charged dust motions, and cosmic ray modulation in the heliosphere.

Cosmic ray north-south anisotropy: The role of the interplanetary magnetic field

1982 ◽  
Vol 87 (A12) ◽  
pp. 10325 ◽  
Author(s):  
M. A. Pomerantz ◽  
S. P. Duggal ◽  
A. J. Owens ◽  
M. F. Tolba ◽  
C. H. Tsao
Keyword(s):  
Magnetic Field ◽  
Interplanetary Magnetic Field ◽  
Cosmic Ray

scholarly journals Analysis of cosmic ray dynamics and ionospheric parameters during increased solar activity and magnetic storms

2019 ◽  
Vol 127 ◽  
pp. 02002 ◽  
Author(s):  
Oksana Mandrikova ◽  
Yuryi Polozov ◽  
Bogdana Mandrikova
Keyword(s):  
Magnetic Field ◽  
Solar Activity ◽  
Interplanetary Magnetic Field ◽  
Cosmic Ray ◽  
Weather Forecast ◽  
Magnetic Storms ◽  
Regression Methods ◽  
New Methods ◽  
Ground Station ◽  
Field Correlation

Based on the ground station data, the paper investigates the dynamics of space rays and ionospheric parameters during strong and moderate magnetic storms 2018. The research was carried out applying new methods for modeling and data analysis suggested by the authors. In the course of investigation, anomalous changes in ionospheric parameters preceding and accompanying magnetic storms were detected. When they were compared with the data of cosmic rays and interplanetary magnetic field, correlation was observed. It confirms the solar nature of the detected ionospheric effects. Application of regression methods confirmed the assumption on statistically significant effect of interplanetary magnetic field parameters on ionospheric parameter dynamics during increased solar activity. The results are of interest in the tasks of space weather forecast.

The second spherical harmonic of the diurnal variation and the orientation of the interplanetary magnetic field

1968 ◽  
Vol 46 (10) ◽  
pp. S973-S975 ◽  
Author(s):  
G. V. Skeipin ◽  
P. A. Krivoshapkin ◽  
G. F. Krymsky ◽  
A. I. Kuzmin
Keyword(s):  
Magnetic Field ◽  
Diurnal Variation ◽  
Interplanetary Magnetic Field ◽  
Neutron Monitor ◽  
Spherical Harmonic ◽  
Cosmic Ray ◽  
Vector Information ◽  
Neutron Monitor Data ◽  
Distribution Vector ◽  
Monitor Data

The super neutron monitor data from Goose Bay and Deep River for 1965 have been analyzed to give month-to-month changes of the first and second harmonics of the solar-diurnal variation. Using these results together with various suppositions about the nature of the cosmic-ray distribution vector, information is obtained concerning the orientation of the interplanetary magnetic field.

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