Coronal Mass Ejections are vast structures of plasma and magnetic fields that are expelled from the sun into the heliosphere. This material is detected by remote sensing and in-situ spacecraft observations. The present study deals with the influence of four types of CMEs namely Asymmetric 'Full' Halo CMEs, Partial Halo CMEs, Asymmetric and Complex 'Full' Halo CMEs and 'Full' Halo CMEs on cosmic ray neutron monitor intensity. The data of ground based neutron monitor of Moscow and CME events observed with instruments onboard and Wind spacecraft have been used in the present analysis. The method of superposed epoch (Chree) analysis has been used to the arrival times of these CMEs. It is noteworthy that the frequency of occurrence of Asymmetric 'Full' Halo CMEs is significantly high, whereas frequency of occurrence of Asymmetric and Complex 'Full' Halo CMEs is low compared to other CMEs. Significant enhancement in cosmic ray intensity is observed after 4 days of the onset of asymmetric full halo and 6 days after the onset of full halo CMEs. The fluctuations in cosmic ray intensity are more prior to the onset of both types of the CMEs. However, during Partial Halo CMEs the cosmic ray intensity peaks, 8- 9 days prior to the onset of CMEs and depressed 3 days prior to the onset of CMEs, whereas in case of asymmetric and complex full CMEs, the intensity depressed 2 days prior to the onset of CMEs and enhanced 2 days after the onset of CMEs. The deviations in cosmic ray intensity are more pronounced in case for asymmetric and complex full halo CMEs compared to other CMEs. The cosmic ray intensity shows nearly good anti-correlation with IMF strength (B) during asymmetric full halo CMEs and partial halo CMEs, whereas it shows poor correlation with B during other CMEs. The IMF, B significantly decreased five days prior to the onset of asymmetric and full halo CMEs and four days after the onset of partial halo CMEs, whereas IMF strength (B) significantly enhanced 5-6 days prior and after the onset of asymmetric and complex full halo CMEs. IMF strength (B) significantly depressed 2 days prior and 4 days after the onset of full halo CMEs. However, IMF, B significantly enhanced from its minimum to maximum values in 2 days interval prior to the onset of CMEs and in 3 days interval after the onset of CMEs.
Inhaltsverzeichnis (Table of Contents)
- Abstract
- Introduction
- Data and analysis
- Results and Discussion
- Conclusions
- References
Zielsetzung und Themenschwerpunkte (Objectives and Key Themes)
This research paper investigates the impact of coronal mass ejections (CMEs) on galactic cosmic ray (GCR) intensity. The study focuses on the relationship between CMEs and fluctuations in GCR intensity as observed by ground-based neutron monitors and spacecraft. The primary goal is to understand the influence of different CME types on cosmic ray variations.
- Influence of CMEs on cosmic ray intensity
- Analysis of different CME types and their effects
- Correlation between CME occurrence and GCR modulation
- Relationship between cosmic ray intensity and interplanetary magnetic field (IMF)
- Impact of CMEs on Earth's magnetic field and geomagnetic storms
Zusammenfassung der Kapitel (Chapter Summaries)
- Abstract: This section provides a concise overview of the paper's focus, methodology, and key findings. It highlights the influence of different types of CMEs on cosmic ray intensity and the correlation with the interplanetary magnetic field.
- Introduction: The introduction presents the historical context of CME research and the evolving understanding of their impact on cosmic rays. It discusses previous findings related to CME-related particle events and their contribution to geomagnetic storms.
- Data and analysis: This section outlines the data sources and methodologies used in the study. It describes the CME events observed by SOHO and Wind spacecraft, the cosmic ray intensity data from the Moscow neutron monitor, and the statistical analysis techniques employed.
- Results and Discussion: This section presents the detailed findings of the study, including the observed effects of different CME types on GCR intensity. It analyzes the relationship between CME occurrence, GCR variations, and IMF strength. The section also discusses the statistical significance of the results and provides insights into the mechanisms behind the observed phenomena.
Schlüsselwörter (Keywords)
This research paper focuses on the impact of coronal mass ejections (CMEs) on galactic cosmic rays (GCRs), specifically investigating the relationship between different CME types and fluctuations in GCR intensity. The study utilizes data from ground-based neutron monitors and spacecraft observations, analyzing the correlation between CME occurrence, GCR modulation, and interplanetary magnetic field (IMF) strength. This investigation aims to provide a deeper understanding of the influence of solar activity on cosmic ray behavior and its potential implications for Earth's magnetic environment.
- Quote paper
- Rajesh Kumar Mishra (Author), Rekha Agarwal (Author), 2023, Cosmic ray and interplanetary magnetic field during the passage of Coronal mass ejections, Munich, GRIN Verlag, https://www.grin.com/document/1425394
