SMS scnews item created by Alex Casella at Mon 5 Jun 2017 0954
Type: Seminar
Distribution: World
Expiry: 4 Sep 2017
Calendar1: 5 Jun 2017 1700-1800
CalLoc1: Carslaw 535A
CalTitle1: MaPSS: Mathematical Postgraduate Seminar Series
Auth: casella@10.17.24.212 (acas5565) in SMS-WASM

# MaPSS: Mathematical Postgraduate Seminar Series: Matthew Cassel (Sydney University) -- A Multiple Scales Approach to Sunspots

Dear All,

We are delighted to present the MaPSS Seminar topic of today, Monday 05/06; please see
the abstract below.

**This Semester the Seminar will always run on Monday, at 5:00pm in 535A**

Following the talk, there will be pizza on offer.

Speaker: Joel Gibson (Sydney University)

Title: A Multiple Scales Approach to Sunspots

Abstract: Very strong magnetic fields exist throughout the universe.  Sunspots are one
such example.  These localised regions of reduced temperature on the solar surface were
first observed in the 8th century BC.  Spots arise due to complex interactions between
temperature, convection and magnetism.  Whilst the dynamics have been examined since the
1930s, this interplay is still poorly understood.  Examining the quantitative behaviour
of the governing equations presents a significant challenge.  We discuss a multiple
scales approach to deriving a new set of governing equations and show that we can
reproduce dynamics consistent with the theory, in turn highlighting the importance of
non-linear corrections to the system.