Plasmapause location under quiet geomagnetic conditions (Kp ≤ 1): THEMIS observations

H. J. Kwon; K. H. Kim; G. Jee; J. S. Park; H. Jin; Y. Nishimura

doi:10.1002/2015GL066090

Plasmapause location under quiet geomagnetic conditions (Kp ≤ 1): THEMIS observations

H. J. Kwon, K. H. Kim, G. Jee, J. S. Park, H. Jin, Y. Nishimura

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Abstract

We statistically examined the plasmapause location (L_pp) under quiet geomagnetic conditions (Kp ≤ 1) using the electron density inferred from the Time History of Events and Macroscale Interactions during Substorms (THEMIS) spacecraft potential for 2 year period (2008 and 2009). Five hundred forty-three L_pp samples were identified under steady quiet conditions with Kp values ≤ 1 during 12 h prior to the plasmapause crossing. From our large data set, we determined the medians and means of L_pp in L and magnetic local time (MLT). They are located near geosynchronous orbit and nearly circular. The L_pp medians show a slight bulge located in postdusk sector. Comparing with previous models, our median or mean L_pp is extended 1-2 L from the Earth than the model L_pp along the local time from 0800 to 2400 MLT. That is, L_pp locations in the previous models are underestimated during quiet geomagnetic conditions.

Original language	English
Pages (from-to)	7303-7310
Number of pages	8
Journal	Geophysical Research Letters
Volume	42
Issue number	18
DOIs	https://doi.org/10.1002/2015GL066090
Publication status	Published - 28 Sept 2015

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© 2015 American Geophysical Union. All Rights Reserved.

Keywords

Plasmapause

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title = "Plasmapause location under quiet geomagnetic conditions (Kp ≤ 1): THEMIS observations",

abstract = "We statistically examined the plasmapause location (Lpp) under quiet geomagnetic conditions (Kp ≤ 1) using the electron density inferred from the Time History of Events and Macroscale Interactions during Substorms (THEMIS) spacecraft potential for 2 year period (2008 and 2009). Five hundred forty-three Lpp samples were identified under steady quiet conditions with Kp values ≤ 1 during 12 h prior to the plasmapause crossing. From our large data set, we determined the medians and means of Lpp in L and magnetic local time (MLT). They are located near geosynchronous orbit and nearly circular. The Lpp medians show a slight bulge located in postdusk sector. Comparing with previous models, our median or mean Lpp is extended 1-2 L from the Earth than the model Lpp along the local time from 0800 to 2400 MLT. That is, Lpp locations in the previous models are underestimated during quiet geomagnetic conditions.",

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T1 - Plasmapause location under quiet geomagnetic conditions (Kp ≤ 1)

T2 - THEMIS observations

AU - Kwon, H. J.

AU - Kim, K. H.

AU - Jee, G.

AU - Park, J. S.

AU - Jin, H.

AU - Nishimura, Y.

PY - 2015/9/28

Y1 - 2015/9/28

N2 - We statistically examined the plasmapause location (Lpp) under quiet geomagnetic conditions (Kp ≤ 1) using the electron density inferred from the Time History of Events and Macroscale Interactions during Substorms (THEMIS) spacecraft potential for 2 year period (2008 and 2009). Five hundred forty-three Lpp samples were identified under steady quiet conditions with Kp values ≤ 1 during 12 h prior to the plasmapause crossing. From our large data set, we determined the medians and means of Lpp in L and magnetic local time (MLT). They are located near geosynchronous orbit and nearly circular. The Lpp medians show a slight bulge located in postdusk sector. Comparing with previous models, our median or mean Lpp is extended 1-2 L from the Earth than the model Lpp along the local time from 0800 to 2400 MLT. That is, Lpp locations in the previous models are underestimated during quiet geomagnetic conditions.

AB - We statistically examined the plasmapause location (Lpp) under quiet geomagnetic conditions (Kp ≤ 1) using the electron density inferred from the Time History of Events and Macroscale Interactions during Substorms (THEMIS) spacecraft potential for 2 year period (2008 and 2009). Five hundred forty-three Lpp samples were identified under steady quiet conditions with Kp values ≤ 1 during 12 h prior to the plasmapause crossing. From our large data set, we determined the medians and means of Lpp in L and magnetic local time (MLT). They are located near geosynchronous orbit and nearly circular. The Lpp medians show a slight bulge located in postdusk sector. Comparing with previous models, our median or mean Lpp is extended 1-2 L from the Earth than the model Lpp along the local time from 0800 to 2400 MLT. That is, Lpp locations in the previous models are underestimated during quiet geomagnetic conditions.

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JO - Geophysical Research Letters

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ER -

Plasmapause location under quiet geomagnetic conditions (Kp ≤ 1): THEMIS observations

Abstract

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Keywords

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