85 citations · 736 across the 31 of their papers we have counts for
27 papers · 1 filter
The Role of High-frequency Transverse Oscillations in Coronal Heating
Daye Lim, Tom Van Doorsselaere, David Berghmans +3
Transverse oscillations that do not show significant damping in solar coronal loops are found to be ubiquitous. Recently, the discovery of high-frequency transverse oscillations in…
Detection of Solar Filaments using Suncharts from Kodaikanal Solar Observatory Archive Employing a Clustering Approach
Aditya Priyadarshi, Manjunath Hegde, Bibhuti Kumar Jha +4
With over 100 years of solar observations, the Kodaikanal Solar Observatory (KoSO) is a one-of-a-kind solar data repository in the world. Among its many data catalogues, the `sunch…
Extending the Sunspot Area Series from Kodaikanal Solar Observatory
Bibhuti Kumar Jha, Manjunath Hegde, Aditya Priyadarshi +3
Kodaikanal Solar Observatory (KoSO) possesses one of world's longest and homogeneous records of sunspot observations that span more than a century (1904-2017). Interestingly, these…
What drives decayless kink oscillations in active region coronal loops on the Sun?
Sudip Mandal, Lakshmi P. Chitta, Patrick Antolin +19
We study here the phenomena of decayless kink oscillations in a system of active region (AR) coronal loops. Using high resolution observations from two different instruments, namel…
A highly dynamic small-scale jet in a polar coronal hole
Sudip Mandal, Lakshmi Pradeep Chitta, Hardi Peter +6
We present an observational study of the plasma dynamics at the base of a solar coronal jet, using high resolution extreme ultraviolet imaging data taken by the Extreme Ultraviolet…
Propagating brightenings in small loop-like structures in the quiet Sun corona: Observations from Solar Orbiter/EUI
Sudip Mandal, Hardi Peter, Lakshmi Pradeep Chitta +6
Brightenings observed in the solar extreme-ultraviolet (EUV) images are generally interpreted as signatures of micro- or nanoflares occurring at the transition region or coronal te…
Reconstructing solar irradiance from historical Ca II K observations. I. Method and its validation
Theodosios Chatzistergos, Natalie A. Krivova, Ilaria Ermolli +5
Knowledge of solar irradiance variability is critical to Earth's climate models and understanding the solar influence on Earth's climate. Direct solar irradiance measurements are o…
Flare induced decay-less transverse oscillations in solar coronal loops
Sudip Mandal, Hui Tian, Hardi Peter
Evidence of flare induced, large-amplitude, decay-less transverse oscillations is presented. A system of multi-thermal coronal loops as observed with the Atmospheric Imaging Assemb…
On the size distribution of spots within sunspot groups
Sudip Mandal, Natalie A. Krivova, Robert Cameron +1
Size distribution of sunspots provides key information about the generation and emergence processes of the solar magnetic field. Previous studies on the size distribution have prim…
Measurements of Solar Differential Rotation Using the Century Long Kodaikanal Sunspot Data
Bibhuti Kumar Jha, Aditya Priyadarshi, Sudip Mandal +2
The rotational profile of the Sun is considered to be one of the key inputs in a solar dynamo model. Hence, precise and long-term measurements of this quantity is important for our…
Sunspot area catalogue revisited: Daily cross-calibrated areas since 1874
Sudip Mandal, Natalie A. Krivova, Sami K. Solanki +2
Long and consistent sunspot area records are important for understanding the long-term solar activity and variability. Multiple observatories around the globe have regularly record…
Magnetic field dependence of bipolar magnetic region tilts on the Sun: Indication of tilt quenching
Bibhuti Kumar Jha, Bidya Binay Karak, Sudip Mandal +1
The tilt of bipolar magnetic region (BMR) is crucial in the Babcock--Leighton process for the generation of the poloidal magnetic field in Sun. Based on the thin flux tube model of…
Study of Sunspot Penumbra to Umbra Area Ratio using Kodaikanal White-light Digitized Data
Bibhuti Kumar Jha, Sudip Mandal, Dipankar Banerjee
We study the long-term behaviour of sunspot penumbra to umbra area ratio by analyzing the recently digitized Kodaikanal white-light data (1923-2011). We implement an automatic umbr…
Can the long-term hemispheric asymmetry of solar activity result from fluctuations in dynamo parameters?
Alexander Nepomnyashchikh, Sudip Mandal, Dipankar Banerjee +1
The hemispheric asymmetry of sunspot activity observed possesses a regular component varying on a time scale of several solar cycles whose origin and properties are currently debat…
Double-peaks of the solar cycle: An explanation from a dynamo model
Bidya Binay Karak, Sudip Mandal, Dipankar Banerjee
One peculiar feature of the solar cycle which is yet to be understood properly is the frequent occurrence of double peaks (also known as the Gnevyshev peaks). Not only the double p…
Long-term variation of sunspot penumbra to umbra area ratio: A study using Kodaikanal white-light Digitized Data
Bibhuti Kumar Jha, Sudip Mandal, Dipankar Banerjee
A typical sunspot, as seen in white-light intensity images, has a two part structure: a dark umbra and a lighter penumbra. Such distinction primarily arises due to the different or…
A Statistical Study on The Frequency-Dependent Damping of Slow-mode Waves in Polar Plumes and Interplumes
Sudip Mandal, S. Krishna Prasad, Dipankar Banerjee
We perform a statistical study on the frequency-dependent damping of slow waves propagating along polar plumes and interplumes in the solar corona. Analysis of a large sample of ex…
Latitude Distribution of Sunspots: Analysis Using Sunspot Data and A Dynamo Model
Sudip Mandal, Bidya Binay Karak, Dipankar Banerjee
In this paper, we explore the evolution of sunspot latitude distribution and explore its relations with the cycle strength. With the progress of the solar cycle, the distributions…
Association Of Supergranule Mean Scales with Solar Cycle Strengths and Total Solar Irradiance
Sudip Mandal, Subhamoy Chatterjee, Dipankar Banerjee
We analyze the long-term behavior of supergranule scale parameter, in active and quiet regions (AR, QR), using the Kodaikanal digitized data archive. This database provides century…
Variation of Supergranule Parameters With Solar Cycles: Results From Century-Long Kodaikanal Digitized Ca II K Data
Subhamoy Chatterjee, Sudip Mandal, Dipankar Banerjee
The century-long (1907-2007) Ca II K spectroheliograms from Kodaikanal Solar Observatory, India, has recently been digitised and calibrated. Applying a fully-automated algorithm (w…
Association of Plages With Sunspots: A multi wavelength Study Using Kodaikanal Ca K and Greenwich sunspot area Data
Sudip Mandal, Subhamoy Chatterjee, Dipankar Banerjee
Plages are the magnetically active chromospheric structures prominently visible in Ca K line (3933.67 Å). A plage may or may not be associated with a sun…
Solar Active Longitudes From Kodaikanal White-light Digitized Data
Sudip Mandal, Subhamoy Chatterjee, Dipankar Banerjee
The study of solar active longitudes has generated a great interest in the recent years. In this work we have used an unique continuous sunspot data series obtained from Kodaikanal…
Sunspot Sizes and The Solar Cycle: Analysis Using Kodaikanal White-light Digitized Data
Sudip Mandal, Dipankar Banerjee
Sizes of the sunspots vary in a wide range during the progression of a solar cycle. Long-term variation study of different sunspot sizes are key to better understand the underlying…
Kodaikanal Digitized White-light Data Archive (1921-2011): Analysis of various solar cycle features
Sudip Mandal, Manjunath Hegde, Tanmoy Samanta +3
Long-term sunspot observations are key to understand and predict the solar activities and its effects on the space weather.Consistent observations which are crucial for long-term v…