Dynamics of Explosive Events by Interface Region Imaging Spectrograph
arXiv:2207.01107 · doi:10.1007/s11207-022-01990-x
Abstract
In this research, we investigate Explosive Events (EEs) in the off-limb solar atmosphere, with simultaneous observations from the Si IV, Mg II k, and slit-jaw images (SJI) of the Interface Region Imaging Spectrograph (IRIS), on 17 August 2014, and 19 February. IRIS data can be investigated to observe the motion of matter, fluctuations, energy absorption, and heat transition of the solar atmosphere. Mechanisms responsible for solar large-scale structures, such as flares and coronal mass ejections, might originate from these small scale energetic events. Therefore, the study of these events can be helpful for understanding mechanisms in mass and energy transport from the chromosphere toward the transition region and corona. We obtain intensity profiles from spectra in two altitudes, i.e., at the solar limb and 5 arcsec distance from the solar limb, and then analyze the EE fluctuations at these two altitudes along the slit. We find that some spectral line profiles show enhancements in blue and red wings indicating upward and downward flows, and some profiles have opposite EEs in both wings. The amplitude of the Doppler velocity in the two data sets of different altitudes was approximated to be about 50 km/s. We calculated the phase velocity of the oscillations using a technique based on cross-correlation. The phase velocity is obtained as about 220 km/s. According to the periodic red and blue enhancements in EEs, we suggest that the fluctuations in the EEs with one side enhancement indicate a swaying motion of spicules about their axes, and those EEs observed in both wings indicate a rotational motion of spicules. The swaying and rotational motions are indicative of kink and torsional waves, respectively.
arXiv comment18 pages, 9 figures
References in corpus (34)
- The Interface Region Imaging Spectrograph (IRIS)
- A Tale Of Two Spicules: The Impact of Spicules on the Magnetic Chromosphere
- Hot Explosions in the Cool Atmosphere of the Sun
- The formation of IRIS diagnostics II. The formation of the Mg II h&k lines in the solar atmosphere
- Ubiquitous torsional motions in type II spicules
- On-disk counterparts of type II spicules in the Ca II 854.2 nm and Halpha lines
- Quantifying Spicules
- The formation of IRIS diagnostics I. A quintessential model atom of Mg II and general formation properties of the Mg II h&k lines
- An Interface Region Imaging Spectrograph first view on Solar Spicules
- On the prevalence of small-scale twist in the solar chromosphere and transition region
- Search for high velocities in the disk counterpart of type II spicules
- The Unresolved Fine Structure Resolved - IRIS observations of the Solar Transition Region
- Interplay of three kinds of motion in the disk counterpart of type II spicules: up-flow, transversal and torsional motions
- Statistical properties of the Disk Counterparts of Type II Spicules from simultaneous observations of RBEs in Ca II 8542 and Hα
- Doppler shift oscillations in solar spicules
- Heating signatures in the disk counterparts of solar spicules in IRIS observations
- The Dynamics of Rapid Redshifted and Blueshifted Excursions in the Solar Halpha line
- Observation of coronal loop torsional oscillation
- Limb Spicules from the Ground and from Space
- Spectroscopic evidence for helicity in explosive events
- Internetwork chromospheric bright grains observed with IRIS
- A Statistical Analysis of the SOT-Hinode Observations of Solar Spicules and their Wave-like Behavior
- Spicules and downflows in the solar chromosphere
- Explosive events - swirling transition region jets
- Investigating the Transition Region Explosive Events and Their Relationship to Network Jets
- IRIS Mg II Observations and Non-LTE Modeling of Off-limb Spicules in a Solar Polar Coronal Hole
- Alfvenic waves in polar spicules
- Limb Event Brightenings and Fast Ejection Using IRIS Mission Observations
- Evidence of multithermal nature of spicular downflows. Impact on solar atmospheric heating
- Synchronized Observations of Bright Points from the Solar Photosphere to Corona
- Characteristics of Chromospheric Oscillation Periods in Magnetic Bright Points (MBPs)
- Signatures of transition region explosive events in hydrogen Ly-beta profiles
- Chromospheric peculiar off-limb dynamical events from IRIS observations
- Evidence for Energy Supply by Active Region Spicules to the Solar Atmosphere
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- Explosive Events in the Quiet Sun Near and Beyond the Solar Limb Observed with the Interface Region Imaging Spectrograph (IRIS)
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