Speaker
Shin Toriumi
(National Astronomical Observatory of Japan)
Description
Emerging flux regions (EFRs) are known to exhibit various
local heating events in the
chromosphere. In this talk, we will introduce our two topics
on this issue utilizing
both Hinode and IRIS observations. First, we will focus on the
repeated brightenings and jet ejections seen in the light
bridge structures in EFRs
(Toriumi et al. 2015a,b).
Combining not only the Hinode-IRIS observations but also the
EFR simulations, we
found that the above energy-releasing events are the
recurrent magnetic reconnection
between the light bridge fields and the sunspot fields,
driven ultimately by
continuous magneto-convective evolution within the light
bridge. The latter half will
be dedicated to our recent analysis on the sporadic
chromospheric bursts seen in the
earliest phase of the EFRs. By comparing the chromospheric
spectra obtained by IRIS
and the high-resolution vector fields by Hinode/SOT/SP, we
categorized these events into two groups, local reconnection
between colliding
magnetic elements of opposite polarities (like Ellerman
bombs) and continuous heating
caused by fast downflows along the arch filament systems,
both of which support the
physical picture of EFRs. In the presentation, we would like
to emphasize that such
cooperative observations may open a door to further
understand the thermal, magnetic,
and dynamic evolution of EFRs.
Primary author
Shin Toriumi
(National Astronomical Observatory of Japan)
