Properties of magnetic clouds and geomagnetic storms associated with eruption of coronal sigmoids

Details Properties of magnetic clouds and geomagnetic storms associated with eruption of coronal sigmoids Properties of magnetic clouds and geomagnetic storms associated with eruption of coronal sigmoids

Sep 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jgra..107.1234l&link_type=abstract

Journal of Geophysical Research (Space Physics), Volume 107, Issue A9, pp. SSH 1-1, CiteID 1234, DOI 10.1029/2001JA000313

Astronomy and Astrophysics

Astrophysics

23

Interplanetary Physics: Ejecta, Driver Gases, And Magnetic Clouds, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions, Solar Physics, Astrophysics, And Astronomy: Corona, And Astronomy: Coronal Mass Ejections

Scientific paper

We study 46 solar coronal eruptions associated with sigmoids seen in images from the Yohkoh Soft X-ray Telescope (SXT). We relate the properties of the sigmoids to in situ measurements at 1 AU and geomagnetic storms. Our primary result is that erupting sigmoids tend to produce geoeffective magnetic clouds (MCs): 85% of the erupting sigmoidal structures studied spawned at least a ``moderate'' (|Dst| >= 50 nT) geomagnetic storm. A collateral result is that MCs associated with sigmoids do not show the same solar-terrestrial correlations as those associated with filaments and, as such, form a distinct class of events. First, rather than reversing with the global solar dipole (at solar maximum), the leading field in MCs weakly (2:1) shows a solar cycle (Hale polarity) based correlation (reversing at solar minimum). Second, whereas the handedness of MCs associated with filament eruptions is strongly (95%) related to their launch hemisphere, that of MCs associated with sigmoid eruptions is only weakly (~70%) so related. Finally, we are unaware of any model of the magnetic fields of sigmoids and their eruption that gives a useful prediction of the leading field orientation of their associated MC.

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