On the Causes of the Slow Solar Wind: 1. The Solar Unipolar Induction Currents.
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| Title: | On the Causes of the Slow Solar Wind: 1. The Solar Unipolar Induction Currents. |
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| Authors: | Lee, Lou‐Chuang1 louclee@earth.sinica.edu.tw, Akasofu, Syun‐Ichi2 |
| Source: | Journal of Geophysical Research. Space Physics. Jul2021, Vol. 126 Issue 7, p1-8. 8p. |
| Subject Terms: | *Solar activity, Solar wind, Solar magnetism, Magnetic fields, Solar gravity |
| Abstract: | The cause of the solar wind is sought on a large‐scale (J × B) force resulting from the solar unipolar induction current, rather than coronal heating and small‐scale processes in the corona. In this paper, we consider the unipolar induction system considered by Alfven (1981, https://doi.org/10.1007/978-94-009-8374-8) the polar current (1.5 × 109 A) flowing out from the polar region of the sun spreads down longitudinally, which produces azimuthal magnetic fields. We considered two models, A and B. In Model A, the current spreads down fairly uniform in five divided regions of the heliosphere (rather than flowing only along the outer surface of the heliosphere). The resulting (J × B) force is mainly directed outward, causing an outward flow of the heliospheric plasmas. However, in this case, the speed at a distance of 1 AU is only 1 km/s, although the acceleration in each divided region is much greater than the solar gravity. In Model B, one third of the dynamo current is assumed to be concentrated in the area between 9.5 R☉ and 10.5 R☉ (where R☉denotes the solar radius) and B = 10−6 T (103 nT) at 10 R☉. The acceleration is estimated to be 1.4 × 102 m/s2 and the resulting speed at 1 AU is 200 km/s. Therefore, there is a possibility that the solar unipolar induction provides partially a new possibility for the cause of a slow, bulk flow of the solar wind. Plain Language Summary: Based on Alfven's solar unipolar induction system, it is shown that the resulting (J × B) force could generate solar wind speed of 200 km/s at 1 AU under several reasonable assumptions. Key Points: The cause of the solar wind is sought on the basis of Alfven's solar unipolar induction current system, rather than an initial heatingThe resulting (J × B) force is applied to the corona between 9.5 and 10.5 solar radii, accelerating the solar wind to 200 km/sThe result is applicable for slow and uniform solar wind with polar angle of 0–70° during the solar cycle minimum phase [ABSTRACT FROM AUTHOR] |
| Copyright of Journal of Geophysical Research. Space Physics is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
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| Items | – Name: Title Label: Title Group: Ti Data: On the Causes of the Slow Solar Wind: 1. The Solar Unipolar Induction Currents. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Lee%2C+Lou‐Chuang%22">Lee, Lou‐Chuang</searchLink><relatesTo>1</relatesTo><i> louclee@earth.sinica.edu.tw</i><br /><searchLink fieldCode="AR" term="%22Akasofu%2C+Syun‐Ichi%22">Akasofu, Syun‐Ichi</searchLink><relatesTo>2</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Geophysical+Research%2E+Space+Physics%22">Journal of Geophysical Research. Space Physics</searchLink>. Jul2021, Vol. 126 Issue 7, p1-8. 8p. – Name: Subject Label: Subject Terms Group: Su Data: *<searchLink fieldCode="DE" term="%22Solar+activity%22">Solar activity</searchLink><br /><searchLink fieldCode="DE" term="%22Solar+wind%22">Solar wind</searchLink><br /><searchLink fieldCode="DE" term="%22Solar+magnetism%22">Solar magnetism</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+fields%22">Magnetic fields</searchLink><br /><searchLink fieldCode="DE" term="%22Solar+gravity%22">Solar gravity</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The cause of the solar wind is sought on a large‐scale (J × B) force resulting from the solar unipolar induction current, rather than coronal heating and small‐scale processes in the corona. In this paper, we consider the unipolar induction system considered by Alfven (1981, https://doi.org/10.1007/978-94-009-8374-8) the polar current (1.5 × 109 A) flowing out from the polar region of the sun spreads down longitudinally, which produces azimuthal magnetic fields. We considered two models, A and B. In Model A, the current spreads down fairly uniform in five divided regions of the heliosphere (rather than flowing only along the outer surface of the heliosphere). The resulting (J × B) force is mainly directed outward, causing an outward flow of the heliospheric plasmas. However, in this case, the speed at a distance of 1 AU is only 1 km/s, although the acceleration in each divided region is much greater than the solar gravity. In Model B, one third of the dynamo current is assumed to be concentrated in the area between 9.5 R☉ and 10.5 R☉ (where R☉denotes the solar radius) and B = 10−6 T (103 nT) at 10 R☉. The acceleration is estimated to be 1.4 × 102 m/s2 and the resulting speed at 1 AU is 200 km/s. Therefore, there is a possibility that the solar unipolar induction provides partially a new possibility for the cause of a slow, bulk flow of the solar wind. Plain Language Summary: Based on Alfven's solar unipolar induction system, it is shown that the resulting (J × B) force could generate solar wind speed of 200 km/s at 1 AU under several reasonable assumptions. Key Points: The cause of the solar wind is sought on the basis of Alfven's solar unipolar induction current system, rather than an initial heatingThe resulting (J × B) force is applied to the corona between 9.5 and 10.5 solar radii, accelerating the solar wind to 200 km/sThe result is applicable for slow and uniform solar wind with polar angle of 0–70° during the solar cycle minimum phase [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Journal of Geophysical Research. Space Physics is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1029/2021JA029358 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 8 StartPage: 1 Subjects: – SubjectFull: Solar activity Type: general – SubjectFull: Solar wind Type: general – SubjectFull: Solar magnetism Type: general – SubjectFull: Magnetic fields Type: general – SubjectFull: Solar gravity Type: general Titles: – TitleFull: On the Causes of the Slow Solar Wind: 1. The Solar Unipolar Induction Currents. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Lee, Lou‐Chuang – PersonEntity: Name: NameFull: Akasofu, Syun‐Ichi IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 07 Text: Jul2021 Type: published Y: 2021 Identifiers: – Type: issn-print Value: 21699380 Numbering: – Type: volume Value: 126 – Type: issue Value: 7 Titles: – TitleFull: Journal of Geophysical Research. Space Physics Type: main |
| ResultId | 1 |
