Magnetic Cloud and Its Interplanetary Shock Sheath as a Modulator of the Cosmic Ray Intensity
Forbush Decreases (FDs) are representative events of abrupt decrease in galactic cosmic ray intensity. They are known to be strongly associated with solar wind events such as interplanetary shock (IP shock) and magnetic cloud (MC). In order to examine effectiveness of the MC on FDs, I studied the 44...
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| Format: | Article |
| Language: | English |
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The Korean Space Science Society
2008-06-01
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| Series: | Journal of Astronomy and Space Sciences |
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| Online Access: | http://ocean.kisti.re.kr/downfile/volume/kosss/OJOOBS/2008/v25n2/OJOOBS_2008_v25n2_149.pdf |
| _version_ | 1797370030766161920 |
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| author | Su Yeon Oh |
| author_facet | Su Yeon Oh |
| author_sort | Su Yeon Oh |
| collection | DOAJ |
| description | Forbush Decreases (FDs) are representative events of abrupt decrease in galactic cosmic ray intensity. They are known to be strongly associated with solar wind events such as interplanetary shock (IP shock) and magnetic cloud (MC). In order to examine effectiveness of the MC on FDs, I studied the 44 MCs that occurred during the 2 years from 1998 to 1999 and investigated the properties of interplanetary magnetic field (IMF) and solar wind. As a result, I found that 11 out of 44 MCs are associated with the FDs. In particularly, it is noted that the FDs are driven by the IP shock sheaths which are associated with over 13 nT of IMF magnitude, 3 nT of IMF turbulence, and 550 km/s of solar wind speed. This result indicates that magnetic cloud and its interplanetary shock sheath work as a modulator of the cosmic ray intensity. |
| first_indexed | 2024-03-08T17:55:32Z |
| format | Article |
| id | doaj.art-b473f58848964a31be50281b545c53bd |
| institution | Directory Open Access Journal |
| issn | 2093-5587 2093-1409 |
| language | English |
| last_indexed | 2024-03-08T17:55:32Z |
| publishDate | 2008-06-01 |
| publisher | The Korean Space Science Society |
| record_format | Article |
| series | Journal of Astronomy and Space Sciences |
| spelling | doaj.art-b473f58848964a31be50281b545c53bd2024-01-02T05:05:40ZengThe Korean Space Science SocietyJournal of Astronomy and Space Sciences2093-55872093-14092008-06-0125214915610.5140/JASS.2008.25.2.149Magnetic Cloud and Its Interplanetary Shock Sheath as a Modulator of the Cosmic Ray IntensitySu Yeon Oh0Dept. of Astronomy and Space Science, Chungnam University, Daejeon 305-764, Korea Forbush Decreases (FDs) are representative events of abrupt decrease in galactic cosmic ray intensity. They are known to be strongly associated with solar wind events such as interplanetary shock (IP shock) and magnetic cloud (MC). In order to examine effectiveness of the MC on FDs, I studied the 44 MCs that occurred during the 2 years from 1998 to 1999 and investigated the properties of interplanetary magnetic field (IMF) and solar wind. As a result, I found that 11 out of 44 MCs are associated with the FDs. In particularly, it is noted that the FDs are driven by the IP shock sheaths which are associated with over 13 nT of IMF magnitude, 3 nT of IMF turbulence, and 550 km/s of solar wind speed. This result indicates that magnetic cloud and its interplanetary shock sheath work as a modulator of the cosmic ray intensity.http://ocean.kisti.re.kr/downfile/volume/kosss/OJOOBS/2008/v25n2/OJOOBS_2008_v25n2_149.pdfForbush DecreaseCosmic rayMagnetic cloudInterplanetary shock |
| spellingShingle | Su Yeon Oh Magnetic Cloud and Its Interplanetary Shock Sheath as a Modulator of the Cosmic Ray Intensity Journal of Astronomy and Space Sciences Forbush Decrease Cosmic ray Magnetic cloud Interplanetary shock |
| title | Magnetic Cloud and Its Interplanetary Shock Sheath as a Modulator of the Cosmic Ray Intensity |
| title_full | Magnetic Cloud and Its Interplanetary Shock Sheath as a Modulator of the Cosmic Ray Intensity |
| title_fullStr | Magnetic Cloud and Its Interplanetary Shock Sheath as a Modulator of the Cosmic Ray Intensity |
| title_full_unstemmed | Magnetic Cloud and Its Interplanetary Shock Sheath as a Modulator of the Cosmic Ray Intensity |
| title_short | Magnetic Cloud and Its Interplanetary Shock Sheath as a Modulator of the Cosmic Ray Intensity |
| title_sort | magnetic cloud and its interplanetary shock sheath as a modulator of the cosmic ray intensity |
| topic | Forbush Decrease Cosmic ray Magnetic cloud Interplanetary shock |
| url | http://ocean.kisti.re.kr/downfile/volume/kosss/OJOOBS/2008/v25n2/OJOOBS_2008_v25n2_149.pdf |
| work_keys_str_mv | AT suyeonoh magneticcloudanditsinterplanetaryshocksheathasamodulatorofthecosmicrayintensity |