Observational evidence for the relationship between Halpha
surges and large-scale coronal activities
Liu, Yu
From the observations taken by ground-based Halpha telescopes
and space SOHO/LASCO instruments, we found that some emerging
flux activities could trigger large-scale reconstruction of
coronal fields, i.e., coronal mass ejections (CMEs). This
indicates that the small-scale magnetic flux emerged from
below the photosphere could in fact drive out the preexisting
coronal flux from below. In a preliminary statistical study
based on 12 long-length surges, it was found that the morphology
of surges should have close relationship to the shape of the
CMEs associated. The spike (or, jet)-like surges correspond
to the jetlike CMEs, the diffused surges usually occurred
associated with halo CMEs, while the highly sheared surges
were found to have no obvious CME association. We deduced that
the different Halpha surge morphology should suggest different
situation of the coronal fields before the coronal disturbance
caused by EFRs.
Correspondence
Liu, Yu (liu@kwasan.kyoto-u.ac.jp), Kwasan and Hida Observatories, Kyoto University
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