  Emerging flux regions (EFRs) are known to exhibit various sporadic local
heating events in the lower atmosphere. To investigate the characteristics of
these events, especially to link the photospheric magnetic fields and
atmospheric dynamics, we analyze Hinode, IRIS, and SDO data of a new EFR in
NOAA AR 12401. Out of 151 bright points (BPs) identified in Hinode/SOT Ca
images, 29 are overlapped by an SOT/SP scan. Seven BPs in the EFR center
possess mixed-polarity magnetic backgrounds in the photosphere. Their IRIS UV
spectra (e.g., Si IV 1402.8 A) are strongly enhanced and red- or blue-shifted
with tails reaching +/- 150 km/s, which is highly suggestive of bi-directional
jets, and each brightening lasts for 10 - 15 minutes leaving flare-like light
curves. Most of this group show bald patches, the U-shaped photospheric
magnetic loops. Another 10 BPs are found in unipolar regions at the EFR edges.
They are generally weaker in UV intensities and exhibit systematic redshifts
with Doppler speeds up to 40 km/s, which could exceed the local sound speed in
the transition region. Both types of BPs show signs of strong temperature
increase in the low chromosphere. These observational results support the
physical picture that heating events in the EFR center are due to magnetic
reconnection within cancelling undular fields like Ellerman bombs, while the
peripheral heating events are due to shocks or strong compressions caused by
fast downflows along the overlying arch filament system.
