Where does “Sonnenaktivität” come from?

Sonnenaktivität (German) comes from German Aktivität, from French activité, from Latin activitas, from Latin āctīvus, from Ancient Greek ἐνεργητικός, from Ancient Greek ἐνεργέω, from Ancient Greek ἐνεργός, from Ancient Greek ἐν- — Creates collective nouns, which refer to groups...

Sonnenaktivität (German): solar variation

Definitions

solar variation

Ancestry of “Sonnenaktivität”, step by step

Sonnenaktivität traces back through two separate lines of ancestry.

via German Aktivität

Step	Language	Word	Meaning
1	German	Aktivität	activity
2	French	activité	activity
3	Latin	activitas	activity, movement, action
4	Latin	āctīvus	active
5	Ancient Greek	ἐνεργητικός	Able to act on; acting on; Active; In the active...
6	Ancient Greek	ἐνεργέω	to be in action or activity, to operate; to...
7	Ancient Greek	ἐνεργός	at work, active
8	Ancient Greek	ἐν-	in, within; on
9	Ancient Greek	ἐν	in, on, at; among; in, at, or during the time of
10	Ancient Greek	δέρμα	skin, hide
11	Ancient Greek	γλυφή	carving, carved work; hole cut
12	Ancient Greek	-ῐ́ᾱ	{{l\|en\|-ia}}; "suffix forming abstract feminine...
13	Proto-Indo-European	-íh₂	—
14	Proto-Indo-European	-h₂	Creates collective nouns, which refer to groups...

via German sonne

Step	Language	Word	Meaning
1	German	sonne	Contraction of so eine; Ungrammatical synonym of...
2	Middle High German	sunne	sun
3	Old High German	sunna	sun; an excuse; justification
4	Proto-West Germanic	sunnā	sun
5	Proto-Germanic	sunnǭ	the sun
6	Proto-Indo-European	sh̥₂uén	sun; the Sun
7	Proto-Indo-European	sóh₂wl̥	sun

Every word from Proto-Indo-European -h₂ →Every word from Ancient Greek -ῐ́ᾱ →Every word from Ancient Greek ἐν- →