Well Solar Fields - Extended isn't like other Solar Fields' work. It's much chilled, softer percussion, even more journey like. Artists like Aes Dana & Hol Baumann are much more beat orientated, like solar fields' leaving home, blue moon station.
For albums with a similar style to Extended try
Elemental Journey - Absolute Ambient.com Volume 2
Healer - Higher Grounds
Cymphonic - Strataradialis
Lammergeyer - Birds Of Prey
Rena Jones - Driftwood
all come close in style but non are quite the same as Extended. It is pretty unique for me