| タイトル | On a Cyclic Variation of the Hemispheric Helicity Rule |
| 著者（英） | Pevtsov, A. A.; Canfield, R. C.; Blehm, Z.; Hagyard, M. J.; Sakurai, T.; Smith, J. E. |
| 著者所属（英） | NASA Marshall Space Flight Center |
| 発行日 | 2003-01-01 |
| 言語 | eng |
| 内容記述 | We report the result of a study magnetic helicity in solar active regions during 1980-2000.Using the vector magnetograms four different instruments we calculated the force-free parameter alpha as in Pevtsov et al.(1995). We use alpha as the proxy for current helicity density. |
| NASA分類 | Solar Physics |
| 権利 | Copyright |
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