Mausumi Dikpati

Triggering the Birth of New Cycle's Sunspots by Solar Tsunami

Image depicting global tachocline fluid top surface deformations
Monday, February 18, 2019

We demonstrate a novel physical mechanism, namely, that a “solar tsunami” occurring in the Sun’s interior shear-fluid layer can trigger new cycle’s magnetic flux emergence at high latitudes, a few weeks after the cessation of old cycle’s flux emergence near the equator.

Magnetic tsunami in the Sun triggers new space weather events in 2020

Image of global tachocline fluid top surface deformations

Most people have heard about tsunamis in the Earth’s oceans. Those occur when large masses of water get violently moved at the ocean floor, as a result of earthquakes or volcanic eruptions.

Role of Interaction Between Magnetic Rossby Waves and Tachocline Differential Rotation in Producing Solar Seasons

Synoptic maps
Wednesday, January 24, 2018

Mausumi Dikpati presents a nonlinear magnetohydrodynamic shallow-water model for the solar tachocline (MHD-SWT) that generates quasi-periodic tachocline nonlinear oscillations (TNOs) that can be identified with the recently discovered solar 'seasons'.

An Observationally Constrained 3D Potential-Field Source-Surface Model for The Evolution of Longitude-Dependent Coronal Structures

Model output from the analysis of Carrington rotation 1912
Thursday, December 28, 2017

Mausumi Dikpati explains the challenge of creating synoptic maps of the photosphere that reliably reflect conditions at all locations concurrently is a major limitation to progress in this area.

What causes the "seasons" in space weather?

Oscillation between differential rotation kinetic energy (solid red curve) and perturbation Rossby waves kinetic energy (red dashed curve)

It is widely known that the Sun has 'spots'--dark areas on its surface that are well known to contain strong magnetic fields, much stronger than the Earth's field. The number of spots seen on the Sun waxes and wanes with a period of roughly eleven years, the 'solar cycle'.

An Observationally Constrained 3D Model

Carrington rotation 1775
Tuesday, October 24, 2017

A 3D Potential-Field Source-Surface Model for the Evolution of Longitude-Dependent Coronal Structures: We explore a complementary approach to traditional magnetogram-based coronal field solutions.

Mausumi Dikpati Receives 2017 Wenner-Gren guest professorship award

Mausumi Dikpati portrait

Mausumi Dikpati of HAO has won a 2017 Wenner-Gren guest professorship award of Stockholm. This prestigious award is given annually to 6–8 scientists worldwide from all areas of science. About 30–50 scientists get nominated each year.

A SOLAR DYNAMO MODEL USING ENSEMBLE KALMAN FILTERS

Poloidal and toroidal magnetic fields
Thursday, September 8, 2016

We implement an Ensemble Kalman Filter procedure using the Data Assimilation Research Testbed for assimilating "synthetic" meridional flow-speed data in a Babcock–Leighton-type flux-transport solar dynamo model.

Mausumi Dikpati promoted to Senior Scientist

Mausumi Dikpati

Congratulations to Mausumi Dikpati for her recent promotion to Senior Scientist. Mausumi received her PhD in physics from the Indian Institute of Science in Bangalore.

Mausumi Dikpati

Dr. Mausumi Dikpati is a Senior Scientist in the High Altitude Observatory at the National Center for Atmospheric Research. Her main research interest is in modeling dynamics and MHD of the solar interior and the solar dynamo.

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