Mausumi Dikpati

Physics Of MHD Rossby Waves In The Sun

Graphic image of the physics Of MHD Rossby Waves In The Sun
Wednesday, June 10, 2020

Evidence of the existence of hydrodynamic and MHD Rossby waves in the Sun is accumulating rapidly.

Space Weather Challenge & Forecasting Implications Of Rossby Waves

Graph depicting solar magnetic weather
Tuesday, March 31, 2020

Rossby waves arise in thin layers within fluid regions of stars and planets. These global wave-like patterns occur due to the variation in Coriolis forces with latitude. In the past several years observational evidence has indicated that there are also Rossby waves in the Sun.

Mausumi Dikpati Interviewed Live by Astronomy & Space

Photograph of Mausumi Dikpati, senior scientist at HAO

Mausumi Dikpati is a senior scientist at HAO. She studies the dynamics between Rossby waves and solar activity such as flares and coronal mass ejections (CMEs).

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.

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