Assertion: corona discharge | /r/HasProperty | positive
Facets:
Source sentences:
text: The corona is positive when only the anode displays a corona discharge.
text: Under the negatively charged thundercloud (see Figure 1), the background electric field at ground level is upward and the corona discharge is positive, and the positive corona ions are produced from the tip of an object.
text: The corona is positive when only the anode displays a corona discharge.