Editing SMART-1 (section)

===SPEDE===
The Spacecraft Potential, Electron and Dust Experiment. The experiment weighed 0.8&nbsp;kg and had a power consumption of 1.8 watts. Its function was to measure the properties and density of the plasma around the spacecraft, either as a Langmuir probe or as an electric field probe. SPEDE observed the emission of the spacecraft's ion engine and the "wake" the Moon leaves to the [[solar wind]]. Unlike most other instruments that have to be shut down to prevent damage, SPEDE could keep measuring inside radiation belts and in solar storms, such as the [[Halloween solar storms, 2003|Halloween 2003 solar storms]].<ref>{{Cite web |url=http://sci.esa.int/smart-1/31415-instruments/ |website=sci.esa.int |title=ESA Science & Technology - Instruments}}</ref><ref name="Schmidt2014">{{cite journal | bibcode = 2014EGUGA..1613174S | title=SMART-1 SPEDE: Results and Legacy after 10 Years | volume=16 | year=2014 |author1=Schmidt, Walter |author2=Mälkki, Anssi | journal=EGU General Assembly Conference Abstracts | pages=13174 }}</ref> It was built by [[Finnish Meteorological Institute]] and its name was intentionally chosen so that its acronym is the same as the nickname of [[Spede Pasanen]], a famous Finnish movie actor, movie producer, and inventor. The algorithms developed for SPEDE were later used in the [[ESA]] lander [[Philae_(spacecraft)|Philae]].<ref name="Schmidt2014" />