-- card: 5060 from stack: in
-- bmap block id: 0
-- flags: 0000
-- background id: 2623
-- name: 


-- part contents for background part 30
----- text -----
14

-- part contents for background part 31
----- text -----
6

-- part contents for background part 32
----- text -----
29

-- part contents for background part 13
----- text -----
The 11-year solar cycle refers to


-- part contents for background part 14
----- text -----
the average time between collisions of protons

-- part contents for background part 15
----- text -----
the time for a photon to reach the surface

-- part contents for background part 16
----- text -----
the time to change overall magnetic polarity

-- part contents for background part 17
----- text -----
the lifetime of a typical sunspot

-- part contents for background part 25
----- text -----
3

-- part contents for background part 38
----- text -----
false