Words* I use on a daily basis that are not included in my computer's dictionary.

auroral
dayside
nightside
poleward
substorm
dispersions
equatorward
upflowing
magnetosheath
intensifications
situ** (as in in situ which is technically Latin)
stackplot
downtail
upgoing
overplotted
plasmas
magnetotail
magnetospheric
Bursty
Imager
versa**

*Note that this does not include words that take the name of a person, nor does it include acronyms. Both of these things get the red squiggle.

**Blogger (or is it Firefox?) also does not consider this to be a word.