Heliotropism:
1.  Tendency for an animal or plant to grow or move towards sunlight. 
2. Héliotropisme (in French) Migratory flux of people or a demographic towards a region with a sunnier climate, see also ‘European Sunbelt”.

This term accounts for my own upbringing in Marseille.
 Héliotropisme is a reflection on notions of ‘home’ as well as a testimony of the making of a landscape and a people.