Spectroscopic study of solar transition region oscillations in the quiet-Sun observed by IRIS using Si IV spectral line
arXiv:2209.07993 · doi:10.1093/mnras/stac2649
Abstract
In the present paper, we use Si IV 1393.755 Å spectral line observed by the Interface Region Imaging Spectrograph (IRIS) in the quiet-Sun to determine physical nature of the solar transition region (TR) oscillations. We analyze the properties of these oscillations using wavelet tools (e.g., power, cross-power, coherence, and phase difference) along with the stringent noise model (i.e., power-law + constant). We estimate the period of the intensity and Doppler velocity oscillations at each chosen location in the quiet-Sun (QS) and quantify the distribution of the statistically significant power and associated periods in one bright and two dark regions. In the bright TR region, the mean periods in intensity and velocity are 7 min, and 8 min respectively. In the dark region, the mean periods in intensity and velocity are 7 min, and 5.4 min respectively. We also estimate the phase difference between the intensity and Doppler velocity oscillations at each location. The statistical distribution of phase difference is estimated, which peaks at -119\degree 13\degree, 33\degree 10\degree, 102\degree 10\degree\ in the bright region, while at -153\degree 13\degree, 6\degree 20\degree, 151\degree 10\degree\ in the dark region. The statistical distribution reveals that the oscillations are caused by propagating slow magnetoacoustic waves encountered with the TR. Some of these locations may also be associated with the standing slow waves. Even, in the given time domain, several locations exhibit presence of both propagating and standing oscillations at different frequencies.
arXiv comment16 pages, 11 figures
References in corpus (41)
- The Interface Region Imaging Spectrograph (IRIS)
- Coronal heating by MHD waves
- Multiwavelength studies of MHD waves in the solar chromosphere: An overview of recent results
- Standing Slow-Mode Waves in Hot Coronal Loops: Observations, Modeling, and Coronal Seismology
- Wave Heating of the Solar Atmosphere
- Hinode/EIS observations of propagating low-frequency slow magnetoacoustic waves in fan-like coronal loops
- Slow-Mode Magnetoacoustic Waves in Coronal Loops
- The Source of Three-minute Magneto-acoustic Oscillations in Coronal Fans
- Propagating slow magnetoacoustic waves in coronal loops observed by Hinode/EIS
- On The Fourier And Wavelet Analysis Of Coronal Time Series
- MHD Waves in open coronal structures
- Doppler shift oscillations in solar spicules
- Frequency-dependent damping in propagating slow magneto-acoustic waves
- Multi-height observations of magnetoacoustic cut-off frequency in a sunspot atmosphere
- High-frequency Oscillations in Small Magnetic Elements Observed with Sunrise/SuFI
- On the Source of Propagating Slow Magneto-acoustic Waves in Sunspots
- Frequency drifts of 3-min oscillations in microwave and EUV emission above sunspots
- Forward Modelling of Standing Slow Modes in Flaring Coronal Loops
- Waves in Solar Coronal Loops
- Vertical Propagation of Acoustic Waves in the Solar Inter-Network as Observed by IRIS
- Doppler Shift, Intensity, and Density Oscillations Observed with the EUV Imaging Spectrometer on Hinode
- Sunspot transition region oscillations in NOAA 8156
- Observations of Solar Doppler Shift Oscillations with the EUV Imaging Spectrometer on Hinode
- Chromospheric Heating by MHD Waves and Instabilities
- Mode identification of MHD waves in an active region observed with Hinode/EIS
- Role of Compressive Viscosity and Thermal Conductivity on the Damping of Slow Waves in the Coronal Loops With and Without Heating-Cooling Imbalance
- Observational study of chromospheric heating by acoustic waves
- Determination of transport coefficients by coronal seismology of flare-induced slow-mode waves: Numerical parametric study of 1D loop model
- Effect of Thermal Conductivity, Compressive Viscosity and Radiative Cooling on the Phase Shift of Propagating Slow Waves with and without Heating-Cooling Imbalance
- Propagation of Waves above a Plage as Observed by IRIS and SDO
- Role of Non-Ideal Dissipation with Heating-Cooling Misbalance on the Phase Shifts of Standing Slow Magnetohydrodynamic Waves
- Oscillations in active region fan loops: Observations from EIS/{\it Hinode} and AIA/SDO
- Observations of upward propagating waves in the transition region and corona above Sunspots
- Wave amplitude modulation in fan loops as observed by AIA/SDO
- New views on the emission and structure of the solar transition region
- Transition-Region Velocity Oscillations Observed by EUNIS-06
- Slow Mode Oscillations and Damping of Hot Solar Coronal Loops
- Network oscillations at the boundary of an equatorial coronal hole
- IRIS observations of chromospheric heating by acoustic waves in solar quiet and active regions
- Wave propagation in a solar quiet region and the influence of the magnetic canopy
- Propagating Oscillations in the Lower Atmosphere under Coronal Holes