Work

Chromospheric and Transition Region Responses of Activities at the Base of Coronal Plumes

Year: 2026

Type: article

Abstract: We present the identification of the cospatial and cotemporal small scale jets—sometimes also named as jetlets—at the base of the coronal hole plume associated with chromospheric and transition region (TR) flows. We identified 19 jets with coordinated observations recorded on 2016 March 19, using the Solar Dynamics Observatory (SDO) and the Interface Region Imaging Spectrograph. Our analysis of the Si iv 1393.7 Å line suggests blueshifts mostly in the range of 10–33 km s −1 , but a few less than −10 km s −1 , while analysis of cospatial Mg ii h and k lines shows both blueshifts and redshifts in the range of –9 to 17 km s −1 . We observed highly asymmetric, enhanced intensity in the Si iv line during these events. The upflows observed in TR through Si iv are strongly correlated with chromospheric downflows observed in Mg ii . We interpret these results as a signature of interchange reconnections creating bidirectional flows—giving rise to upflows (downflows) in the TR (chromosphere).

Source: The Astrophysical Journal

DOI: 10.3847/1538-4357/aea3ff

Authors: Biswanath Malaker, Vishal Upendran, Durgesh Tripathi

Institutions: Inter-University Centre for Astronomy and Astrophysics, Lockheed (United States), Search for Extraterrestrial Intelligence

Language: English

Topic: Solar and Space Plasma Dynamics

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $4,499

Funders: National Aeronautics and Space Administration, Indo-French Centre for the Promotion of Advanced Research, Ames Research Center