Some estimates go as as high as Kp 9.0 which is the top end of the scale. Other estimates are lower.
Y'all ever heard of the 1859 Carrington Event?
The day after Carrington observed the impressive flare, Earth experienced an unprecedented geomagnetic storm, with telegraph systems going haywire and auroral displays — normally confined to polar latitudes — visible in the tropics, according to NASA Science.
Carrington put two and two together and realized that the solar flare he'd seen was almost certainly the cause of this massive geomagnetic disturbance. This was a connection that had never previously been made, according to NASA Spaceflight. The solar storm of 1859 is now known as the Carrington Event in his honor.
The Carrington Event sparked a huge geomagnetic storm that wreaked havoc with technology. Earth fell silent as telegraph communications around the world failed.
In his book:
Power Disruption?
Y'all ever heard of the 1859 Carrington Event?
The day after Carrington observed the impressive flare, Earth experienced an unprecedented geomagnetic storm, with telegraph systems going haywire and auroral displays — normally confined to polar latitudes — visible in the tropics, according to NASA Science.
Carrington put two and two together and realized that the solar flare he'd seen was almost certainly the cause of this massive geomagnetic disturbance. This was a connection that had never previously been made, according to NASA Spaceflight. The solar storm of 1859 is now known as the Carrington Event in his honor.
The Carrington Event sparked a huge geomagnetic storm that wreaked havoc with technology. Earth fell silent as telegraph communications around the world failed.
In his book:
Blackout Wars: State Initiatives To Achieve Preparedness Against An Electromagnetic Pulse (EMP) Catastrophe
Dr. Peter Vincent Pry specifically talks about the Carrington event.Power Disruption?