[ClearCase_guy]

protecting life and satellites from harmful radiation from the sun

If the field were disrupted, could (in effect) fire and sulfur rain down from heaven and destroy a couple of sinful cities in the Dead Sea area?

[siunevada]

The magnetosphere protects the planet from solar radiation. Ever feel like you were frying under intense sunlight? You were. (see - sunburn) So. a localized weakening would probably lead to radiation poisoning and eventual death.