  Whether the upcoming cycle 24 of solar activity will be strong or not is
being hotly debated. The solar cycle is produced by a complex dynamo mechanism.
We model the last few solar cycles by `feeding' observational data of the Sun's
polar magnetic field into our solar dynamo model. Our results fit the observed
sunspot numbers of cycles 21-23 extremely well and predict that cycle~24 will
be about 35% weaker than cycle~23.
