5 papers
Multi-Instrument Analysis of NOAA AR 12781: Coupling Surface Evolution of the AR with Its In-Situ Solar Wind Signatures
Dharanesh Palaniappan, Khagendra Katuwal
Understanding the relationship between photospheric magnetic flux evolution and coronal emission remains an important problem in heliophysics. We investigate the decay of NOAA Acti…
Study of Butterfly-Shaped Coronal Hole Evolution Across the Solar Disk
Bhairab Ale, Khagendra Katuwal, Shiv Narayan Yadav
We studied the evolution of a butterfly-shaped coronal hole (CH) observed from 2025 September 8 to 14 using SDO/AIA 193~Å images and SDO/HMI line-of-sight magnetograms. The CH boun…
Solar-Cycle Variation of Newly Emerging Coronal Holes during Solar Cycle 24
Akash Vinod Shirke, Khagendra Katuwal
Coronal holes (CHs) are regions of predominantly open magnetic field and important sources of high-speed solar wind streams. We present a manually compiled catalogue of newly emerg…
Unipolarity of the solar magnetic field in equatorial coronal holes
Khagendra Katuwal, R. T. James McAteer
A study of the unbalanced magnetic polarity distribution of 70 coronal holes was performed. Data from the Helioseismic and Magnetic Imager (HMI) were used to examine the photospher…
The CHASM-SWPC Dataset for Coronal Hole Detection & Analysis
Cutter Beck, Evan Smith, Khagendra Katuwal +2
Coronal holes (CHs) are low-activity, low-density solar coronal regions with open magnetic field lines (Cranmer 2009). In the extreme ultraviolet (EUV) spectrum, CHs appear as dark…