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Title: The Cold Ion Population at Geosynchronous Orbit and Transport to the Dayside Magnetopause: September 2015 to February 2016

Abstract

During intervals of enhanced magnetospheric convection, a high-density plume of cold ions is eroded from the plasmasphere and can flow toward the dayside magnetopause where it has the potential to reduce the rate of magnetic reconnection. In any interval of long-duration enhanced convection, tons of ions may follow such a trajectory. The study here concerns cold ion observations from geosynchronous orbit (GEO) during both calm and active periods. Probability distributions of the cold ion density and cold ion flow speed are determined during the 6-month period from September 2015 to February 2016, inclusive. During low geomagnetic activity, the cold, dense ions are in corotation with the Earth, and flow speeds seldom exceed 10 km/s. During elevated geomagnetic activity, the cold ions between 12 and 18 magnetic local time are observed to flow toward the dayside magnetosphere with a speed of >10 km/s approximately 50% of the time. The Shue et al. (1998, https://doi.org/10.1029/98JA01103) model of the magnetopause location is used to derive the distribution of approximate minimum times for the cold ions to be transported from GEO to the dayside magnetopause. On average, during enhanced convection periods (Kp > 3) ions will take a mean time of ~4.5 hr tomore » travel from GEO to the dayside magnetopause.« less

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]
  1. Space Science Inst., Boulder, CO (United States); New Mexico Consortium, Los Alamos, NM (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Univ. of Colorado, Boulder, CO (United States); National Oceanic and Atmospheric Administration (NOAA), Boulder, CO (United States)
  4. Southwest Research Inst., San Antonio, TX (United States); Univ. of Texas at San Antonio, TX (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
National Aeronautics and Space Administration (NASA); USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1660593
Report Number(s):
LA-UR-19-24714
Journal ID: ISSN 2169-9380; TRN: US2203529
Grant/Contract Number:  
89233218CNA000001; NNX16AB83G; NNX16AB75G; 80NSSC17K0682; 80NSSC19K1107
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Space Physics
Additional Journal Information:
Journal Volume: 124; Journal Issue: 11; Journal ID: ISSN 2169-9380
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; Heliospheric and Magnetospheric Physics

Citation Formats

Denton, Mick H., Henderson, Michael Gerard, Maruyama, N., and Fuselier, Steve A. The Cold Ion Population at Geosynchronous Orbit and Transport to the Dayside Magnetopause: September 2015 to February 2016. United States: N. p., 2019. Web. doi:10.1029/2019ja026973.
Denton, Mick H., Henderson, Michael Gerard, Maruyama, N., & Fuselier, Steve A. The Cold Ion Population at Geosynchronous Orbit and Transport to the Dayside Magnetopause: September 2015 to February 2016. United States. https://doi.org/10.1029/2019ja026973
Denton, Mick H., Henderson, Michael Gerard, Maruyama, N., and Fuselier, Steve A. Sat . "The Cold Ion Population at Geosynchronous Orbit and Transport to the Dayside Magnetopause: September 2015 to February 2016". United States. https://doi.org/10.1029/2019ja026973. https://www.osti.gov/servlets/purl/1660593.
@article{osti_1660593,
title = {The Cold Ion Population at Geosynchronous Orbit and Transport to the Dayside Magnetopause: September 2015 to February 2016},
author = {Denton, Mick H. and Henderson, Michael Gerard and Maruyama, N. and Fuselier, Steve A.},
abstractNote = {During intervals of enhanced magnetospheric convection, a high-density plume of cold ions is eroded from the plasmasphere and can flow toward the dayside magnetopause where it has the potential to reduce the rate of magnetic reconnection. In any interval of long-duration enhanced convection, tons of ions may follow such a trajectory. The study here concerns cold ion observations from geosynchronous orbit (GEO) during both calm and active periods. Probability distributions of the cold ion density and cold ion flow speed are determined during the 6-month period from September 2015 to February 2016, inclusive. During low geomagnetic activity, the cold, dense ions are in corotation with the Earth, and flow speeds seldom exceed 10 km/s. During elevated geomagnetic activity, the cold ions between 12 and 18 magnetic local time are observed to flow toward the dayside magnetosphere with a speed of >10 km/s approximately 50% of the time. The Shue et al. (1998, https://doi.org/10.1029/98JA01103) model of the magnetopause location is used to derive the distribution of approximate minimum times for the cold ions to be transported from GEO to the dayside magnetopause. On average, during enhanced convection periods (Kp > 3) ions will take a mean time of ~4.5 hr to travel from GEO to the dayside magnetopause.},
doi = {10.1029/2019ja026973},
journal = {Journal of Geophysical Research. Space Physics},
number = 11,
volume = 124,
place = {United States},
year = {2019},
month = {10}
}

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Figures / Tables:

Figure 1 Figure 1: Example ion density and flow vectors measured by a single LANL satellite (01A) during a calm period in 2014 when co-rotation dominates (top) and a disturbed period in 2015 when flow to the dayside occurs (bottom).

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Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.