131097
This effect was eventually attributed to overhead electric currents flowing in the ionosphere and magnetosphere by Balfour Stewart in 1882 , and confirmed by Arthur Schuster in 1889 from analysis of magnetic observatory data .
 Balfour Stewart, Arthur Schuster
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Balfour Stewart, Arthur Schuster