Arase probe and Earth's radiation barrier

What happened before and after this story. Background events not previously covered were summarised by AI.

1. 27 Nov 2014Background

   Van Allen Probes find sharp barrier blocking ultra-fast electrons

   In November 2014, NASA's Van Allen Probes reported a sharp inner edge in Earth's radiation belt that ultra-relativistic electrons rarely crossed.

2. 10 May 2024Background

   G5 geomagnetic storm hits Earth, first of its class in two decades

   In May 2024 a series of solar eruptions triggered the first G5 geomagnetic storm in two decades, bringing auroras to Florida and Mexico.

3. 

   9 Nov

   Earth's radiation shield wasn't as tight as thought, Japan's Arase probe finds

   A 5,000-fold jump in ultra-fast electrons during the May 2024 solar storm suggests the barrier around Earth's radiation belts can be crossed after all.