Springer Nature
Space Science Reviews
,  volume 221 ,  issue 2 ,  publication number 30

The Analyzer for Cusp Ions (ACI) on the TRACERS Mission

S. A. Fuselier 1, 2
, 
Matthew A. Freeman 1
, 
Craig A Kletzing 3
, 
Sean R. Christopherson 1
, 
Michael J. Covello 1
, 
Daniel De Luna 1
, 
Raymond L. Doty 1
, 
Colin G. Elder 1
, 
Judith D. Furman 1
, 
Jonathan Gasser 1
, 
Don E George 1
, 
Roman G. Gomez 1
, 
Guy A. Grubbs 1
, 
Kristie Llera 1
, 
David M Miles 3
, 
Joey Mukherjee 1
, 
Kristian B Persson 1
, 
Steven M. Petrinec 4
, 
Dinesh K. V. Radhakrishnan 1, 2
, 
Christopher L. Ramirez 1
, 
Ashley S. Reisig 1
, 
Charline Rodriguez 1
, 
Courtney A Rouse 1
, 
David A Ruggles 1
, 
Shawn D. Schwarz 1
, 
Jonathan R. Sekula 1
, 
Linda J. Shipp 1
, 
Justyna M Sokół 1
, 
Kylie M. Sullivan 1, 2
, 
Karlheinz J Trattner 5
, 
Sarah K. Vines 1
1
 
Southwest Research Institute, San Antonio, USA | 
2
 
3
 
4
 
Lockheed Martin Advanced Technology Center, Palo Alto, USA | 
5
 
Publication type: Journal Article
Publication date: 2025-03-13
Springer Nature
scimago Q1
wos Q1
SJR: 2.289
CiteScore: 17.6
Impact factor: 7.4
ISSN: 00386308, 15729672
Abstract
The Analyzers for Cusp Ions (ACIs) on the TRACERS mission measure ion velocity distribution functions in the magnetospheric cusp from two closely spaced spacecraft in low Earth orbit. The precipitating and upflowing ion measurements contribute to the overarching goal of the TRACERS mission and are key to all three science objectives of the mission. ACI is a toroidal top-hat electrostatic analyzer on a spinning platform that provides full angular coverage with instantaneous 22.5° × ∼6° angular resolution for a single energy step. ACI has an ion energy range from ∼8 eV/e to 20,000 eV/e covered in 47 logarithmic-spaced energy steps with fractional energy resolution of ∼10%. It provides reasonably high cadence (312 ms) measurements of the ion energy-pitch angle distribution with good sensitivity and energy resolution, enabling detection of cusp boundaries and characterization of cusp ion steps.
Found 
Found 

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Fuselier S. A. et al. The Analyzer for Cusp Ions (ACI) on the TRACERS Mission // Space Science Reviews. 2025. Vol. 221. No. 2. 30
GOST all authors (up to 50) Copy
Fuselier S. A. et al. The Analyzer for Cusp Ions (ACI) on the TRACERS Mission // Space Science Reviews. 2025. Vol. 221. No. 2. 30
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TY - JOUR
DO - 10.1007/s11214-025-01154-w
UR - https://link.springer.com/10.1007/s11214-025-01154-w
TI - The Analyzer for Cusp Ions (ACI) on the TRACERS Mission
T2 - Space Science Reviews
AU - Fuselier, S. A.
AU - Freeman, Matthew A.
AU - Kletzing, Craig A
AU - Christopherson, Sean R.
AU - Covello, Michael J.
AU - De Luna, Daniel
AU - Doty, Raymond L.
AU - Elder, Colin G.
AU - Furman, Judith D.
AU - Gasser, Jonathan
AU - George, Don E
AU - Gomez, Roman G.
AU - Grubbs, Guy A.
AU - Llera, Kristie
AU - Miles, David M
AU - Mukherjee, Joey
AU - Persson, Kristian B
AU - Petrinec, Steven M.
AU - Radhakrishnan, Dinesh K. V.
AU - Ramirez, Christopher L.
AU - Reisig, Ashley S.
AU - Rodriguez, Charline
AU - Rouse, Courtney A
AU - Ruggles, David A
AU - Schwarz, Shawn D.
AU - Sekula, Jonathan R.
AU - Shipp, Linda J.
AU - Sokół, Justyna M
AU - Sullivan, Kylie M.
AU - Trattner, Karlheinz J
AU - Vines, Sarah K.
PY - 2025
DA - 2025/03/13
PB - Springer Nature
IS - 2
VL - 221
SN - 0038-6308
SN - 1572-9672
ER -
BibTex
Cite this
BibTex (up to 50 authors) Copy
@article{2025_Fuselier,
author = {S. A. Fuselier and Matthew A. Freeman and Craig A Kletzing and Sean R. Christopherson and Michael J. Covello and Daniel De Luna and Raymond L. Doty and Colin G. Elder and Judith D. Furman and Jonathan Gasser and Don E George and Roman G. Gomez and Guy A. Grubbs and Kristie Llera and David M Miles and Joey Mukherjee and Kristian B Persson and Steven M. Petrinec and Dinesh K. V. Radhakrishnan and Christopher L. Ramirez and Ashley S. Reisig and Charline Rodriguez and Courtney A Rouse and David A Ruggles and Shawn D. Schwarz and Jonathan R. Sekula and Linda J. Shipp and Justyna M Sokół and Kylie M. Sullivan and Karlheinz J Trattner and Sarah K. Vines and others},
title = {The Analyzer for Cusp Ions (ACI) on the TRACERS Mission},
journal = {Space Science Reviews},
year = {2025},
volume = {221},
publisher = {Springer Nature},
month = {mar},
url = {https://link.springer.com/10.1007/s11214-025-01154-w},
number = {2},
pages = {30},
doi = {10.1007/s11214-025-01154-w}
}