Triggers for Solar Proton Events (SPEs)

[Drax Spacex]

I'm curious why the recent M and X flares have not triggered any solar proton events (SPE).  Can SPEs only be detected in real-time, or is there a way to predict which flares or CMEs are more likely to generate SPEs?

[MinYoongi]

51 minutes ago, Drax Spacex said:

I'm curious why the recent M and X flares have not triggered any solar proton events (SPE).  Can SPEs only be detected in real-time, or is there a way to predict which flares or CMEs are more likely to generate SPEs?

Maybe too far beyond the Limb. Sometimes the Parker Spiral Effect helps them arrive at Earth, but not all the time.

[Sam Warfel]

27 minutes ago, MinYoongi said:

Maybe too far beyond the Limb. Sometimes the Parker Spiral Effect helps them arrive at Earth, but not all the time.

I think that’s Solar energetic particle events. Solar proton events are different. 

(I think)

[Drax Spacex]

SPE="solar proton event", per https://www.spaceweatherlive.com/en/acronyms-and-abbreviations.html

also known as a "solar radiation storm" (e.g. S1, S2, S3, ...)

https://www.spaceweatherlive.com/en/help/what-is-a-solar-radiation-storm.html

Edited April 21, 2022 by Drax Spacex

[Vancanneyt Sander]

7 uren geleden, Drax Spacex zei:

I'm curious why the recent M and X flares have not triggered any solar proton events (SPE).  Can SPEs only be detected in real-time, or is there a way to predict which flares or CMEs are more likely to generate SPEs?

Strong eruptive and long duration events cause SPE. The X2 and latest M9 where short in duration and thus less likely to have an SPE.