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19 April 2024 |
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Relationship between the Magnetic Flux of Solar Eruptions and the Ap Index of Geomagnetic Storms | | I. M. Chertok
; M. A. Abunina
; A. A. Abunin
; A. V. Belov
; V. V. Grechnev
; | | Date: |
7 Oct 2014 | | Abstract: | Solar coronal mass ejections (CMEs) are main drivers of the most powerful
non-recurrent geomagnetic storms. In the extreme-ultraviolet range, CMEs are
accompanied by bright post-eruption arcades and dark dimmings. The analysis of
events of the Solar Cycle 23 (Chertok et al., 2013, Solar Phys. 282, 175)
revealed that the summarized unsigned magnetic flux in the arcades and dimming
regions at the photospheric level, Phi, is significantly related to the
intensity (Dst index) of geomagnetic storms. This provides the basis for the
earliest diagnosis of geoefficiency of solar eruptions. In the present article,
using the same data set, we find that a noticeable correlation exists also
between the eruptive magnetic flux, Phi, and another geomagnetic index, Ap. As
the magnetic flux increases from tens to approx. 500 (in units of 10^{20} Mx),
the geomagnetic storm intensity measured by the 3-hour Ap index, enhances in
average from Ap approx. 50 to a formally maximum value of 400 (in units of 2
nT). The established relationship shows that in fact the real value of the Ap
index is not limited and during the most severe magnetic storms may
significantly exceed 400. | | Source: | arXiv, 1410.1646 | | Services: | Forum | Review | PDF | Favorites | |
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