tons ▁( in ▁addition ▁to ▁small ▁quantities ▁of ▁heav ier ▁elements ▁such ▁as ▁hel ium , ▁o xygen , ▁and ▁iron ), ▁plus ▁the ▁entra ining ▁cor onal ▁closed ▁magnetic ▁field ▁regions . ▁E volution ▁of ▁these ▁closed ▁magnetic ▁structures ▁in ▁response ▁to ▁various ▁photos pher ic ▁mot ions ▁over ▁different ▁time ▁scales ▁( con ve ction , ▁differential ▁rotation , ▁mer id ional ▁circul ation ) ▁somehow ▁leads ▁to ▁the ▁C ME . ▁Small - scale ▁ener get ic ▁sign atures ▁such ▁as ▁pl asma ▁he ating ▁( ob ser ved ▁as ▁compact ▁soft ▁X - ray ▁bright ening ) ▁may ▁be ▁indic ative ▁of ▁imp ending ▁C ME s . ▁ ▁The ▁soft ▁X - ray ▁sig m oid ▁( an ▁S - sh aped ▁intensity ▁of ▁soft ▁X - ray s ) ▁is ▁an ▁observ ational ▁manifest ation ▁of ▁the ▁connection ▁between ▁cor onal ▁structure ▁and ▁C ME ▁production . ▁" Rel ating ▁the ▁sig m oid s ▁at ▁X - ray ▁( and ▁other ) ▁w avel ength s ▁to ▁magnetic ▁structures ▁and ▁current ▁systems ▁in ▁the ▁solar ▁atmosphere ▁is ▁the ▁key ▁to ▁understanding ▁their ▁relationship ▁to ▁C ME s ." ▁ ▁The ▁first ▁detection ▁of ▁a ▁Cor onal ▁mass ▁e jection ▁( C ME ) ▁as ▁such ▁was ▁made ▁on ▁December ▁ 1 , ▁ 1 9 7 1 , ▁by ▁R . ▁T ouse y ▁of ▁the ▁US ▁Naval ▁Research ▁Labor atory ▁using ▁O SO ▁ 7 . ▁Ear lier ▁observations ▁of ▁cor onal ▁trans ients ▁or