Explanipedia

Structure and Dynamics of the Sun’s Interior Revealed by the Helioseismic and Magnetic Imager Open

А. Г. Косовичев, Sarbani Basu, Yuto Bekki, Juan Camilo Buitrago‐Casas, Theodosios Chatzistergos , et al. · 2025

Seismic differences between solar magnetic cycles 23 and 24 for low-degree modes Open

R.A. García, Sylvain Breton, D. Salabert, S. C. Tripathy, Kiran Jain , et al. · 2024

Solar magnetic activity follows regular cycles of about 11 years with an inversion of polarity in the poles every ∼22 years. This changing surface magnetism impacts the properties of the acoustic modes. The acoustic mode frequency shifts a…

Sensitivity of Global Oscillation Frequencies to Solar Activity on Short Timescales Open

S. C. Tripathy, Kiran Jain · 2024

Sun’s oscillations frequencies vary with the changing magnetic activity and hold a strong positive correlation. While most of the analysis for global modes have been carried out using time series longer than a solar rotation, only a few st…

The Sun’s Large-Scale Flows I: Measurements of Differential Rotation & Torsional Oscillation Open

Sushant S. Mahajan, Lisa Upton, H. M. Antia, Sarbani Basu, Marc L. DeRosa , et al. · 2024

We have developed a comprehensive catalog of the variable differential rotation measured near the solar photosphere. This catalog includes measurements of these flows obtained using several techniques: direct Doppler, granule tracking, mag…

Connection between Subsurface Layers and Surface Magnetic Activity over Multiple Solar Cycles Using GONG Observations Open

Mackenzie A. Baird, S. C. Tripathy, Kiran Jain · 2024

We investigate the spatiotemporal evolution of high-degree acoustic-mode frequencies of the Sun and surface magnetic activity over the course of multiple solar cycles, to improve our understanding of the connection between the solar interi…

Connection between Sub-surface Layers and Surface Magnetic Activity over Multiple Solar Cycles Open

Mackenzie A. Baird, S. C. Tripathy, Kiran Jain · 2023

We investigate spatio-temporal evolution of high-degree acoustic mode frequencies of the Sun and the surface magnetic activity, over the course of multiple solar cycles, to improve our understanding of the connection between the solar inte…

Probing the Sun's Near Surface Shear Layer using HMI Spherical Harmonic Coefficients Open

S. C. Tripathy, Kiran Jain, Shukurijon Kholikov, R. Komm · 2023

We have measured zonal and meridional components of subsurface flows up to a depth of 30 Mm below the solar surface by applying the technique of ring diagram on Dopplergrams which are constructed from the spherical harmonic (SH) coefficien…

Helioseismic Investigation of Quasi-biennial Oscillation Source Regions Open

Kiran Jain, Partha Chowdhury, S. C. Tripathy · 2023

We studied the temporal evolution of quasi-biennial oscillations (QBOs) using acoustic mode oscillation frequencies from the Global Oscillation Network Group. The data used here span more than 25 yr, covering solar cycles 23 and 24 and the…

Helioseismic Investigation of Quasi-biennial Oscillation Source Regions Open

Kiran Jain, Partha Chowdhury, S. C. Tripathy · 2023

We studied the temporal evolution of quasi-biennial oscillations (QBOs) using acoustic mode oscillation frequencies from the Global Oscillation Network Group. The data used here span over more than 25 yr, covering solar cycles 23 and 24 an…

The Sun’s Large-Scale Flows I: Measurements of Differential Rotation & Torsional Oscillation Solar Physics Open

Sushant S. Mahajan, Lisa Upton, H. M. Antia, Sarbani Basu, Marc L. DeRosa , et al. · 2023

We have developed a comprehensive catalog of the variable differential rotation measured near the solar photosphere. This catalog includes measurements of these flows obtained using several techniques: direct Doppler, granule tracking, mag…

Subsurface Flows in Active Regions with Peculiar Magnetic Configurations Open

Kiran Jain, S. C. Tripathy · 2023

We present analysis of the evolution of subsurface flows in and around active regions with peculiar magnetic configurations and compare their characteristics with the normal active regions. We also study the zonal and meridional components…

Improving the Understanding of Subsurface Structure and Dynamics of Solar Active Regions Open

S. C. Tripathy, Kiran Jain, D. C. Braun, P. S. Cally, Mausumi Dikpati , et al. · 2023

photosphere to the chromosphere Multi-height observations will also able to estimate and correct the center-to-limb variation which is crucial for the measurement of meridional flow in the deeper convection zone including the tachocline re…

Space Weather Modeling and Prediction for Intermediate Time-scales Open

Mausumi Dikpati, J. G. Anderson, B. Belucz, D. A. Biesecker, G. D. Bothun , et al. · 2023

Whitepaper #097 in the Decadal Survey for Solar and Space Physics (Heliophysics) 2024-2033. Main topics: space weather applications; basic research. Additional topics: space weather research/operations/research loop; ground-based missions/…

Seismic Monitoring of the Sun’s Far Hemisphere: A Crucial Component in Future Space Weather Forecasting Open

Kiran Jain, C. Lindsey, E. Adamson, C. N. Arge, Thomas Berger , et al. · 2023

Whitepaper #189 in the Decadal Survey for Solar and Space Physics (Heliophysics) 2024-2033. Main topics: space weather applications; basic research. Additional topics: space weather research/operations/research loop; ground-based missions/…

Helioseismology of the solar poles Open

C. S. Baldner, Sarbani Basu, A. C. Birch, R. S. Bogart, D. C. Braun , et al. · 2023

Whitepaper #023 in the Decadal Survey for Solar and Space Physics (Heliophysics) 2024-2033. Main topics: basic research; infrastructure/workforce/other programmatic. Additional topics: solar physics; space-based missions/projects; research…

Solar P-angle Alignment in GONG Dopplergrams Open

Anna L. H. Hughes, Irene Gonzalez-Hernandez, Sean G. McManus, Kiran Jain, S. C. Tripathy · 2023

In helioseismic studies, an observational parameter of primary concern is the P-angle, the angle along which lies the solar axis of rotation for a given image. For the six observing sites employed by The Global Oscillation Network Group (G…

Seismology of active regions: Current status and perspectives Open

S. C. Tripathy · 2023

The goal of helioseismology is to provide accurate information about the Sun’s interior from the observations of the wave field at its surface. In the last three decades, both global and local helioseismology studies have made significant …

Cycle dependence of a quasi-biennial variability in the solar interior Open

Tishtrya Mehta, Kiran Jain, S. C. Tripathy, René Kiefer, Dmitrii Y. Kolotkov , et al. · 2022

We investigated the solar cycle dependence on the presence and periodicity of the Quasi-Biennial Oscillation (QBO). Using helioseismic techniques, we used solar oscillation frequencies from the Global Oscillations Network Group (GONG), Mic…

What Seismic Minimum Reveals about Solar Magnetism below the Surface Open

Kiran Jain, Niket Jain, S. C. Tripathy, Mausumi Dikpati · 2022

The Sun’s magnetic field varies on multiple timescales. Observations show that the minimum between cycles 24 and 25 was the second consecutive minimum that was deeper and wider than several earlier minima. Since the active regions observed…

What is Exceptional about Solar Activity in the Early Phase of Cycle 25? Open

Kiran Jain, C. Lindsey, S. C. Tripathy · 2021

Solar Cycle 25 began in 2019 December and has been progressing nominally since. However, a closely associated pair of strong active regions, NOAA 12786 and 12785, emerged in 2020 November. The greater, northern component, 12786, attained a…

Continuous Solar Observations from the Ground—Assessing Duty Cycle from GONG Observations Open

Kiran Jain, S. C. Tripathy, F. Hill, Alexei Pevtsov · 2021

Continuous observations play an important role in the studies of solar variability. While such observations can be achieved from space with almost 100% duty cycle, it is difficult to accomplish very high duty cycle from the ground. In this…

Space Weather Modeling and Prediction for Intermediate Time-scales Open

Mausumi Dikpati, Robert J. Leamon, John Anderson, B. Belucz, D. A. Biesecker , et al. · 2021

“Space Weather” describes the conditions in the terrestrial system, particularly on its outer envelope, that can affect various ground- and space-borne technologies due to the impact of energetic particles and magnetic fields streaming fro…

Modeling the Effects of Observational Gaps on p-mode Oscillation Parameters Open

J. Z. Keith-Hardy, S. C. Tripathy, Kiran Jain · 2019

We investigate the effect of the window function on the parameters of solar acoustic oscillations, namely frequency, amplitude, and width, using the data from Global Oscillation Network Group (GONG). This is carried out by simulating 108 n…

The Sun's Seismic Radius as Measured from the Fundamental Modes of Oscillations and Its Implications for the TSI Variations Open

Kiran Jain, S. C. Tripathy, F. Hill · 2018

In this Letter we explore the relationship between the solar seismic radius and total solar irradiance (TSI) during the last two solar cycles using the uninterrupted data from space-borne instruments on board the Solar and Heliospheric Obs…

22 Year Solar Magnetic Cycle and its relation to Convection Zone Dynamics Open

Kiran Jain, S. C. Tripathy, R. Komm, F. Hill, R. Simoniello · 2018

Using continuous observations for 22 years from ground-based network GONG and space-borne instruments MDI onboard SoHO and HMI onboard SDO , we report both global and local properties of the convection zone and their variations with time.

Probing Subsurface Flows in NOAA Active Region 12192: Comparison with NOAA 10486 Open

Kiran Jain, S. C. Tripathy, F. Hill · 2017

NOAA Active Region (AR) 12192 is the biggest AR observed in solar cycle 24 so far. This was a long-lived AR that survived for four Carrington rotations (CRs) and exhibited several unusual phenomena. We measure the horizontal subsurface flo…

A study of acoustic halos in active region NOAA 11330 using multi-height SDO observations Open

S. C. Tripathy, Kiran Jain, S. Kholikov, F. Hill, S. P. Rajaguru , et al. · 2017

A NEW CHALLENGE TO SOLAR DYNAMO MODELS FROM HELIOSEISMIC OBSERVATIONS: THE LATITUDINAL DEPENDENCE OF THE PROGRESSION OF THE SOLAR CYCLE Open

R. Simoniello, S. C. Tripathy, Kiran Jain, F. Hill · 2016

The onset of the solar cycle at mid-latitudes, the slowdown in the drift of sunspots toward the equator, the tail-like attachment, and the overlap of successive cycles at the time of minimum activity are delicate issues in models of the α …

HORIZONTAL FLOWS IN ACTIVE REGIONS FROM RING-DIAGRAM AND LOCAL CORRELATION TRACKING METHODS Open

Kiran Jain, S. C. Tripathy, B. Ravindra, R. Komm, F. Hill · 2015

Continuous high-cadence and high spatial resolution Dopplergrams allow us to study subsurface dynamics that may be further extended to explore precursors of visible solar activity on the surface. Since the p -mode power is absorbed in the …

S. C. Tripathy YOU? Author Swipe