scholarly journals Study of Cosmic-Ray Modulation During the Recent Unusual Minimum and Mini-Maximum of Solar Cycle 24

Solar Physics ◽  
2015 ◽  
Vol 290 (8) ◽  
pp. 2333-2353 ◽  
Author(s):  
O. P. M. Aslam ◽  
Badruddin
2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Helen Mavromichalaki ◽  
Evangelos Paouris

The cosmic ray modulation in relation to solar activity indices and heliospheric parameters during the period January 1996–October 2011, covering the solar cycle 23 and the ascending phase of solar cycle 24, is studied. The new perspective of this contribution is that the CME-index, obtained from only the CMEs with angular width greater than 30 degrees, gives much better results than in previous works. The proposed model for the calculation of the modulated cosmic ray intensity obtained from the combination of solar indices and heliospheric parameters gives a very satisfactory value of the standard deviation. The best reproduction of the cosmic ray intensity is obtained by taking into account solar and interplanetary indices such as sunspot number, interplanetary magnetic field, CME-index, and heliospheric current sheet tilt. The standard deviation between the observed and calculated values is about 6.63% for the solar cycle 23 and 4.13% for the ascending part of solar cycle 24.


Space Weather ◽  
2017 ◽  
Vol 15 (4) ◽  
pp. 589-605 ◽  
Author(s):  
Shoko Miyake ◽  
Ryuho Kataoka ◽  
Tatsuhiko Sato

2019 ◽  
Vol 14 (1) ◽  
Author(s):  
Meena Pokharia ◽  
Lalan Prasad

The aim of this paper is to investigate the association of the variation of very slow speed solar wind streams (VSSSWS) with the cosmic ray intensity (CRI) and Ae index for solar cycle 24 (2008-2013). A Chree analysis by the superposed epoch method has been done in the study. The results of the present analysis showed that VSSSWS are not able to produce decreases in CRI. The prime source of the variation in magnetic activity near aurora zone is the wind interaction with the magnetosphere, but the speed of VSSSWS is low enough to produce any significant impact on aurora zone magnetic activity.


2019 ◽  
Vol 14 (1) ◽  
Author(s):  
Meena Pokharia ◽  
Lalan Prasad

The aim of this paper is to investigate the association of the variation of very slow speed solar wind streams (VSSSWS) with the cosmic ray intensity (CRI) and Ae index for solar cycle 24 (2008-2013). A Chree analysis by the superposed epoch method has been done in the study. The results of the present analysis showed that VSSSWS are not able to produce decreases in CRI. The prime source of the variation in magnetic activity near aurora zone is the wind interaction with the magnetosphere, but the speed of VSSSWS is low enough to produce any significant impact on aurora zone magnetic activity


2019 ◽  
Vol 64 (12) ◽  
pp. 2477-2489 ◽  
Author(s):  
Nicola Tomassetti ◽  
Fernando Barão ◽  
Bruna Bertucci ◽  
Emanuele Fiandrini ◽  
Miguel Orcinha

2021 ◽  
Vol 85 (3) ◽  
pp. 230-233
Author(s):  
Yu. V. Balabin ◽  
A. V. Belov ◽  
R. T. Gushchina ◽  
V. G. Yanke ◽  
I. V. Yankovsky

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