Long-Term Cosmic Ray Variability and the CME-Index
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 on...
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| Format: | Article |
| Language: | English |
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Wiley
2012-01-01
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| Series: | Advances in Astronomy |
| Online Access: | http://dx.doi.org/10.1155/2012/607172 |
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| author | Helen Mavromichalaki Evangelos Paouris |
| author_facet | Helen Mavromichalaki Evangelos Paouris |
| author_sort | Helen Mavromichalaki |
| collection | DOAJ |
| description | 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. |
| format | Article |
| id | doaj-art-f2e5b46416a4416e96d0a0236bc80a60 |
| institution | Kabale University |
| issn | 1687-7969 1687-7977 |
| language | English |
| publishDate | 2012-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Astronomy |
| spelling | doaj-art-f2e5b46416a4416e96d0a0236bc80a602025-02-03T01:13:13ZengWileyAdvances in Astronomy1687-79691687-79772012-01-01201210.1155/2012/607172607172Long-Term Cosmic Ray Variability and the CME-IndexHelen Mavromichalaki0Evangelos Paouris1Faculty of Physics, National and Kapodistrian University of Athens, Zografos, 15784 Athens, GreeceFaculty of Physics, National and Kapodistrian University of Athens, Zografos, 15784 Athens, GreeceThe 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.http://dx.doi.org/10.1155/2012/607172 |
| spellingShingle | Helen Mavromichalaki Evangelos Paouris Long-Term Cosmic Ray Variability and the CME-Index Advances in Astronomy |
| title | Long-Term Cosmic Ray Variability and the CME-Index |
| title_full | Long-Term Cosmic Ray Variability and the CME-Index |
| title_fullStr | Long-Term Cosmic Ray Variability and the CME-Index |
| title_full_unstemmed | Long-Term Cosmic Ray Variability and the CME-Index |
| title_short | Long-Term Cosmic Ray Variability and the CME-Index |
| title_sort | long term cosmic ray variability and the cme index |
| url | http://dx.doi.org/10.1155/2012/607172 |
| work_keys_str_mv | AT helenmavromichalaki longtermcosmicrayvariabilityandthecmeindex AT evangelospaouris longtermcosmicrayvariabilityandthecmeindex |