IPDP geomagnetic pulsations and their relation to coronal holes and high speed solar wind streams
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| Natura: | Artículo científico |
| Lingua: | en |
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Universidad Nacional Autónoma de México
1998
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| _version_ | 1876430673836769280 |
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| author | J.A.L. Cruz Abeyro |
| author_facet | J.A.L. Cruz Abeyro |
| contents | IPDP geomagnetic pulsations and their relation to coronal holes and high speed solar wind streams J.A.L. Cruz Abeyro S. Bravo Ciencias de la Tierra solar wind magnetic pulsations Geomagnetic activity magnetosphere interaction The frequency of occurrence of intervals of pulsations of diminishing periods(IPDP) has shown a very surprising inverse relation to the sunspot number. In thispaper we take the annual frequency of occurrence of IPDPs at Sodankyla station forthe period 1974 to 1985 and find that they correlate positively with coronal holearea with a correlation coefficient of 0.77. This suggests a physical relationshipbetween this kind of pulsations and the high speed streams (HSSs) in the solar windcoming from the holes. We compare the annual rate of IPDPs to the annual numberof coronal-hole associated HSSs having a velocity equal to or higher than 550 km/sfor the period from 1974 to 1982. We find a good agreement during the descendingpart of the solar cycle and around the maximum, but during the minimum and thefirst years of the ascending phase IPDPs were more frequent than HSSs. Weconclude that IPDPs are related to some solar wind characteristics in HSSs and wediscuss a possible reason for the differences during the minimum. 1998 artículo científico 0016-7169 https://www.redalyc.org/articulo.oa?id=56837105 en http://www.redalyc.org/revista.oa?id=568 Geofísica Internacional application/pdf Universidad Nacional Autónoma de México Geofísica Internacional (México) Num.1 Vol.37 |
| format | Artículo científico |
| id | redalyc_56837105 |
| institution | Redalyc |
| language | en |
| publishDate | 1998 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | IPDP geomagnetic pulsations and their relation to coronal holes and high speed solar wind streams J.A.L. Cruz Abeyro Ciencias de la Tierra solar wind magnetic pulsations Geomagnetic activity magnetosphere interaction IPDP geomagnetic pulsations and their relation to coronal holes and high speed solar wind streams J.A.L. Cruz Abeyro S. Bravo Ciencias de la Tierra solar wind magnetic pulsations Geomagnetic activity magnetosphere interaction The frequency of occurrence of intervals of pulsations of diminishing periods(IPDP) has shown a very surprising inverse relation to the sunspot number. In thispaper we take the annual frequency of occurrence of IPDPs at Sodankyla station forthe period 1974 to 1985 and find that they correlate positively with coronal holearea with a correlation coefficient of 0.77. This suggests a physical relationshipbetween this kind of pulsations and the high speed streams (HSSs) in the solar windcoming from the holes. We compare the annual rate of IPDPs to the annual numberof coronal-hole associated HSSs having a velocity equal to or higher than 550 km/sfor the period from 1974 to 1982. We find a good agreement during the descendingpart of the solar cycle and around the maximum, but during the minimum and thefirst years of the ascending phase IPDPs were more frequent than HSSs. Weconclude that IPDPs are related to some solar wind characteristics in HSSs and wediscuss a possible reason for the differences during the minimum. 1998 artículo científico 0016-7169 https://www.redalyc.org/articulo.oa?id=56837105 en http://www.redalyc.org/revista.oa?id=568 Geofísica Internacional application/pdf Universidad Nacional Autónoma de México Geofísica Internacional (México) Num.1 Vol.37 |
| title | IPDP geomagnetic pulsations and their relation to coronal holes and high speed solar wind streams |
| topic | Ciencias de la Tierra solar wind magnetic pulsations Geomagnetic activity magnetosphere interaction |
| url | https://www.redalyc.org/articulo.oa?id=56837105 |