Total Eclipse of the Sun
Dr Steve Barrett
! "# Feb "$#
Total Eclipse of the Sun!
!
Dr Steve Barrett "# Feb "$#
Total
Eclipse of
the Sun
Total Eclipse of the Sun!
"
Dr Steve Barrett "# Feb "$#
Total Eclipse
of the Sun
Total Eclipse of the Sun!
%
Introduction
The Sun Core
Surface
Atmosphere
Eclipses
Total Eclipse of "& Mar "$'
Why?
When?
Total Eclipse of the Sun!
(
$$)$$)$$)$$ watts
Power * ($)$$)$$)$$)$$
Vital Statistics
Size * !$ x Earth
Mass * !)$$)$$ x Earth
Composition * #+, hydrogen
"+, helium
$-!, other stuff
Total Eclipse of the Sun!
+
Power Source
!.#! Hermann von Helmholtz
Burning coal) one ton per hour per
square foot of the Sun/s surface) would
exhaust the fuel in a few million years
!&!& Sir Arthur Eddington
Conversion of hydrogen to helium could
provide enough energy to power the Sun
for billions of years
Total Eclipse of the Sun!
'
Fusion
hydrogen ! helium 0 energy
Total Eclipse of the Sun
Dr Steve Barrett
" "# Feb "$#
Total Eclipse of the Sun!
#
Fusion
Mass loss ! energy thanks to E 1 mc "
'$ Mt of H ! +&' Mt of He
Sun loses ( million tons every second
Total Eclipse of the Sun!
.
Internal Structure
core
radiation
zone
convection
zone
photosphere
Total Eclipse of the Sun!
&
Helioseismology
Convection zone turbulence can be detected through
the Doppler shift of the photosphere/s emission lines
Total Eclipse of the Sun!
!$
Solar Spectrum
Total Eclipse of the Sun!
!!
Sunspots
Total Eclipse of the Sun!
!"
Sunspots
Total Eclipse of the Sun
Dr Steve Barrett
% "# Feb "$#
Total Eclipse of the Sun!
!%
Sunspots
Total Eclipse of the Sun!
!(
Sunspot Cycle
Total Eclipse of the Sun!
!+
Sunspot Cycle
Total Eclipse of the Sun!
!'
Sunspot Cycle
+$ years of very low sunspot activity coincided
with the 2Little Ice Age/ period of very cold winters
Total Eclipse of the Sun!
!#
Magnetic Loops
Total Eclipse of the Sun!
!.
Magnetic Loops
Total Eclipse of th