To calculate values pertaining to the base of the Sun's convection zone, the following values may be used:
Gravitational acceleration as the base of the convection zone
=
The adiabatic temperature gradient in the Sun's convective zone is:
=
and the temperature gradient difference is
| (8.1) |
| (8.2) |
The ratio of the temperature gradient difference to the adiabatic temperature gradient:
=
This is the degree to which the actual temperature gradient is superadiabatic. Therefore, it is possible to regard the temperature gradient deep in the convective zone as being equal to the adiabatic gradient. This greatly simplifies modelling of the convective zone (Mullan, 2010).
The convective velocity is
=
The convective velocity is about 51 m/s, which is a reasonable estimate (Langer, 2016). This represents
=
approximately 1/10,000 of the sound speed.