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Nov 19, 2013 – “Extracting the DC Electric Field from THEMIS Observations Near Perigee”


Speaker:Sam Califf (LASP)
Date:Nov 19, 2013
Time:4:00 PM
Location:LASP Space Science Building, room N248 upstairs. Map

Seminar Abstract:

The large-scale DC (and low-frequency) electric field plays a major role in the observed structure of the Earth’s magnetosphere. This electric field drives plasma Earthward from the magnetotail leading to the formation of the ring current, it affects the shape and size of the plasmasphere, and it can cause energetic electron enhancement through the slot region and into the inner radiation belt. Accurately observing the DC electric field through spacecraft double probe measurements, however, can be a daunting task as the spacecraft itself corrupts the measurement through photoemission, electrostatic wakes and potentially unknown effects. This presentation will give an overview of the double probe measurement made by THEMIS inside L = 3, and will offer an empirical approach to quantifying the spurious electric fields induced by the spacecraft.