6 30N -10 o Mag 9/12012-9/3/2012 L=4 L=2 10 30N ce Mag Fig.2.Meridional plane projections of the REPT-A and REPT-B electron flux (4.0-5.0 MeV)values as shown according to the logarithmic color scale to the right of the figure.Each panel shows a limited interval of time in a magnetic latitude -L*coordinate system.(A)For 1-3 9/3/2012-9/16/2012 September the expected two-belt Van Allen zone structure =4 10 with an inner zone electron population(L*<~2.5),a relatively empty "slot"region (2.5 <L*<3.0).and an outer zone 0 population (L*>3.0).(B)From 3 September through 6 September only an intense belt of electrons remains in the range 3.0<L*<3.5;the inner zone and traditional slot region 罗 have not changed.(C)The "storage ring"belt,or torus, 5 feature persists at 3.0 L*<3.5 while a new slot region is seen at 3.5 L*<3.8 and a completely new outer zone 号 population has formed at L*>3.8.(D)The storage ring 需 9/122012-9/15/2012 feature remains while the outer zone at L*>3.8 decays 10 away.(E)The entire outer zone (L*>~3.0)has virtually disappeared at these energies. 30°N 0 Mag 9/18/2012-9/212012 30°N 4.5 MeV Electron Flux(cm's sr MeV) 0 Mag 10/12012-10/4/2012 Sciencexpress/http://www.sciencemag org/content/early/recent /28 February 2013/Page 5/10.1126/science.1233518/ http://www.sciencemag.org/content/early/recent / 28 February 2013 / Page 5 / 10.1126/science.1233518 Fig. 2. Meridional plane projections of the REPT-A and REPT-B electron flux (4.0-5.0 MeV) values as shown according to the logarithmic color scale to the right of the figure. Each panel shows a limited interval of time in a magnetic latitude – L* coordinate system. (A) For 1-3 September the expected two-belt Van Allen zone structure with an inner zone electron population (L* < ~2.5), a relatively empty “slot” region (2.5 < L* < 3.0), and an outer zone population (L* > 3.0). (B) From 3 September through 6 September only an intense belt of electrons remains in the range 3.0 < L* < 3.5; the inner zone and traditional slot region have not changed. (C) The “storage ring” belt, or torus, feature persists at 3.0 < L* < 3.5 while a new slot region is seen at 3.5 < L* < 3.8 and a completely new outer zone population has formed at L* > 3.8. (D) The storage ring feature remains while the outer zone at L* > 3.8 decays away. (E) The entire outer zone (L* > ~3.0) has virtually disappeared at these energies. on March 6, 2013 www.sciencemag.org Downloaded from