A shallow-water theory for the sun's active longitudes

Mausumi Dikpati; Peter A. Gilman

doi:10.1086/499626

A shallow-water theory for the sun's active longitudes

Mausumi Dikpati, Peter A. Gilman

Solar Frontiers

National Center for Atmospheric Research

Research output: Contribution to journal › Article › peer-review

57 Scopus citations

Abstract

We show that the global MHD shallow-water instability of differential rotation and toroidal field bands in the solar tachocline provides a possible mechanism for the formation and evolution of active longitudes seen in synoptic maps of photospheric magnetic fields. The mechanism involves the production of upward bulges at selected longitudes in the overshoot tachocline that contain significant toroidal fields.

Original language	English
Pages (from-to)	L193-L196
Journal	Astrophysical Journal
Volume	635
Issue number	2 II
DOIs	https://doi.org/10.1086/499626
State	Published - Dec 20 2005

Keywords

Instabilities
Sun: activity
Sun: evolution
Sun: magnetic fields
Sunspots

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10.1086/499626

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title = "A shallow-water theory for the sun's active longitudes",

abstract = "We show that the global MHD shallow-water instability of differential rotation and toroidal field bands in the solar tachocline provides a possible mechanism for the formation and evolution of active longitudes seen in synoptic maps of photospheric magnetic fields. The mechanism involves the production of upward bulges at selected longitudes in the overshoot tachocline that contain significant toroidal fields.",

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AU - Gilman, Peter A.

PY - 2005/12/20

Y1 - 2005/12/20

N2 - We show that the global MHD shallow-water instability of differential rotation and toroidal field bands in the solar tachocline provides a possible mechanism for the formation and evolution of active longitudes seen in synoptic maps of photospheric magnetic fields. The mechanism involves the production of upward bulges at selected longitudes in the overshoot tachocline that contain significant toroidal fields.

AB - We show that the global MHD shallow-water instability of differential rotation and toroidal field bands in the solar tachocline provides a possible mechanism for the formation and evolution of active longitudes seen in synoptic maps of photospheric magnetic fields. The mechanism involves the production of upward bulges at selected longitudes in the overshoot tachocline that contain significant toroidal fields.

KW - Instabilities

KW - Sun: activity

KW - Sun: evolution

KW - Sun: magnetic fields

KW - Sunspots

UR - https://www.scopus.com/pages/publications/30544435643

U2 - 10.1086/499626

DO - 10.1086/499626

M3 - Article

AN - SCOPUS:30544435643

SN - 0004-637X

VL - 635

SP - L193-L196

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2 II

ER -

A shallow-water theory for the sun's active longitudes

Abstract

Keywords

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