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

Various Local Heating Events in the Earliest Phase of Flux Emergence