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Statistical Study of Rapid Blue Excursions as Mass Conduits in Solar Atmosphere

Govindswaroop Rahangdale

Abstract

Rapid Blue Excursions (RBEs) are transient blue-shifted chromospheric absorption features widely interpreted as the on-disk counterparts of Type II solar spicules. We investigate their dynamic properties using high-cadence spectral observations combined with automated detection and spatio-temporal tracking algorithms. RBEs were identified through blue-wing Doppler asymmetry criteria and tracked using spatial connectivity and centroid continuity methods to determine lifetimes and kinematic evolution. The statistical analysis shows that RBEs are short-lived events with lifetimes predominantly between 20 to 60 s and a mean duration of approximately 75 s. The lifetime distribution follows an exponential decay profile, indicative of impulsive driving. Line-of-sight velocities range from 20 to 140 km s-1, with a mean near 26 km s-1. Projected lengths span 1.2-5.5 Mm with sub-arcsecond widths, and recurrence analysis reveals repeated activity at localized magnetic footpoints. Mass flux estimates suggest that RBEs transport significant plasma upward, contributing to chromospheric mass supply toward the corona. These findings reinforce the role of RBEs as dynamic conduits of mass transfer and key elements in chromosphere-corona coupling.

Statistical Study of Rapid Blue Excursions as Mass Conduits in Solar Atmosphere

Abstract

Rapid Blue Excursions (RBEs) are transient blue-shifted chromospheric absorption features widely interpreted as the on-disk counterparts of Type II solar spicules. We investigate their dynamic properties using high-cadence spectral observations combined with automated detection and spatio-temporal tracking algorithms. RBEs were identified through blue-wing Doppler asymmetry criteria and tracked using spatial connectivity and centroid continuity methods to determine lifetimes and kinematic evolution. The statistical analysis shows that RBEs are short-lived events with lifetimes predominantly between 20 to 60 s and a mean duration of approximately 75 s. The lifetime distribution follows an exponential decay profile, indicative of impulsive driving. Line-of-sight velocities range from 20 to 140 km s-1, with a mean near 26 km s-1. Projected lengths span 1.2-5.5 Mm with sub-arcsecond widths, and recurrence analysis reveals repeated activity at localized magnetic footpoints. Mass flux estimates suggest that RBEs transport significant plasma upward, contributing to chromospheric mass supply toward the corona. These findings reinforce the role of RBEs as dynamic conduits of mass transfer and key elements in chromosphere-corona coupling.
Paper Structure (5 sections, 4 equations, 9 figures, 1 table)

This paper contains 5 sections, 4 equations, 9 figures, 1 table.

Table of Contents

  1. Introduction
  2. Observations
  3. Method
  4. Results
  5. Conclusion and Discussion

Figures (9)

  • Figure 1: (a) SDO/AIA 171 $\mathring{A}$ image of the observed region. (b) SDO/HMI line-of-sight magnetogram of the same field of view.
  • Figure 2: SST $H\alpha\ $core $6563$$\mathring{A}$ intensity image of the observed Field of View, normalized to the background continuum intensity.
  • Figure 3: IRIS Mg ii k intensity image of the observed Field of View.
  • Figure 4: Cumulative map showing all Rapid Blue Excursion (RBE) detections across the observing duration. Each dark feature corresponds to an identified RBE event. Darker regions indicate repeated activity.
  • Figure 5: Plot of the lifetimes of all the RBEs detected.
  • ...and 4 more figures