Editing Ball lightning (section)

=== Electrically charged solid-core model ===
In this model ball lightning is assumed to have a solid, positively charged core. According to this underlying assumption, the core is surrounded by a thin electron layer with a charge nearly equal in magnitude to that of the core. A vacuum exists between the core and the electron layer containing an intense [[electromagnetic field|electromagnetic (EM) field]], which is reflected and guided by the electron layer. The microwave EM field applies a [[ponderomotive force]] (radiation pressure) to the electrons preventing them from falling into the core.<ref>{{cite journal | last1 = Muldrew | first1 = D. B. | year = 1990 | title = The Physical Nature of Ball Lightning | journal = Geophysical Research Letters | volume = 17 | issue = 12 | pages = 2277–2280 | doi = 10.1029/GL017i012p02277 |bibcode = 1990GeoRL..17.2277M }}</ref><ref>{{cite journal | last1 = Muldrew | first1 = D. B. | doi = 10.5194/angeo-28-223-2010 | title = Solid charged-core model of ball lightning | journal = Annales Geophysicae | volume = 28 | issue = 1 | pages = 223–2010 | year = 2010 |bibcode = 2010AnGeo..28..223M | doi-access = free }}</ref>