Abstract


  IRIS AND SDO OBSERVATIONS OF SMALL SCALE RECURRENT EXPLOSIVE EVENTS

  G. Gupta.., IUCAA, girjesh@gmail.com
  D. Tripathi, IUCAA,

We examined several small-scale energy release events in the solar atmosphere. We detected recurrent explosive events (EEs) with time scale of 3-5 min in the solar atmosphere using spectroscopic observations. The observed spectral line profiles showed strong broadening in both red and blue wings during the EEs. Several absorption lines were also found on the top of broadened profiles which indicate that EEs are occurring within the cooler atmosphere. For the first time, we detected short-period variability (30 s and 60-90 s) within the individual EE bursts. Evolution of photospheric magnetic field underneath EEs indicated that negative polarity field emerges in the neighborhood of oppositely directed positive fields which undergo repetitive magnetic flux cancellation events. Our findings suggest that EEs are formed due to magnetic reconnection and are occurring in the lower chromosphere.