[IGPP Everyone] Space Physics seminar - Fri. Feb. 11th, 03:30 PM PST - Uncertainty in solar wind forcing and its relation to polar cap potential saturation (N. Sivadas, NASA GSFC)

[Emmanuel V. Masongsong]

SPACE PHYSICS SEMINAR 



DEPARTMENT OF EARTH, PLANETARY, AND SPACE SCIENCES 

DEPARTMENT OF ATMOSPHERIC AND OCEANIC SCIENCES 
UNIVERSITY OF CALIFORNIA, LOS ANGELES 

ZOOM LINK PROVIDED BELOW 


https://ucla.zoom.us/j/98070654630?pwd=aWdrSktueG9xWjU3cDZiQUhGRXV0UT09 



Uncertainty in solar wind forcing and its relation to polar cap potential saturation 

Nithin Sivadas 

NASA GSFC 
Extreme space weather events occur during intervals of strong solar wind electric fields. Curiously during these intervals, their impact on measures of the Earth's response, like the polar cap index, is not as high as expected. Theorists have put forward a host of explanations for this saturation effect, but there is no consensus. Here we show that the saturation is merely a perception created by uncertainty in the solar wind measurements, especially in the measurement times. Correcting for the uncertainty reveals that extreme space weather events elicit a ~300% larger impact than previously thought. Furthermore, they point to a surprisingly general result relevant to any correlation study: uncertainty in the measurement time can cause a system's linear response to be perceived as non-linear. 

Bernhardt, P.A., et al., Active Precipitation of Radiation Belt Electrons using Rocket Exhaust Driven Amplification (REDA) of Man-Made Whistlers, Submitted to the Journal of Geophysical Research, 2022. 


Friday, Feb. 11th, 2022 

3:30 - 5:00 PM 

In-Charge: Vassilis Angelopoulos 




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