Measurement of Low-energy Cosmic-Ray Electron and Positron Spectra at 1 au with the AESOP-Lite Spectrometer
We report on a new measurement of the cosmic ray (CR) electron and positron spectra in the energy range of 20 MeV -- 1 GeV. The data were taken during the first flight of the balloon-borne spectrometer AESOP-Lite (Anti Electron Sub Orbital Payload), which was flown from Esrange, Sweden, to Ellesmere...
Published in: | The Astrophysical Journal |
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ftcdlib:oai:escholarship.org:ark:/13030/qt8zv384dh 2024-09-15T18:04:47+00:00 Measurement of Low-energy Cosmic-Ray Electron and Positron Spectra at 1 au with the AESOP-Lite Spectrometer Mechbal, Sarah Mangeard, Pierre-Simon Clem, John M Evenson, Paul A Johnson, Robert P Lucas, Brian Roth, James 21 2020-11-01 https://escholarship.org/uc/item/8zv384dh https://doi.org/10.3847/1538-4357/abb46f unknown eScholarship, University of California qt8zv384dh https://escholarship.org/uc/item/8zv384dh doi:10.3847/1538-4357/abb46f public The Astrophysical Journal, vol 903, iss 1 CRs CR detectors Heliosphere Solar wind High altitude balloons astro-ph.HE astro-ph.IM astro-ph.SR physics.ins-det physics.space-ph Astronomical and Space Sciences Atomic Molecular Nuclear Particle and Plasma Physics Physical Chemistry (incl. Structural) Astronomy & Astrophysics article 2020 ftcdlib https://doi.org/10.3847/1538-4357/abb46f 2024-06-28T06:28:19Z We report on a new measurement of the cosmic ray (CR) electron and positron spectra in the energy range of 20 MeV -- 1 GeV. The data were taken during the first flight of the balloon-borne spectrometer AESOP-Lite (Anti Electron Sub Orbital Payload), which was flown from Esrange, Sweden, to Ellesmere Island, Canada, in May 2018. The instrument accumulated over 130 hours of exposure at an average altitude of 3 g.cm$^{-2}$ of residual atmosphere. The experiment uses a gas Cherenkov detector and a magnetic spectrometer, consisting of a permanent dipole magnet and silicon strip detectors (SSDs), to identify particle type and measure the rigidity. Electrons and positrons were detected against a background of protons and atmospheric secondary particles. The primary cosmic ray spectra of electrons and positrons, as well as the re-entrant albedo fluxes, were extracted between 20 MeV -- 1 GeV during a positive solar magnetic polarity epoch. The positron fraction below 100 MeV appears flat, suggesting diffusion dominated solar modulation at low rigidity. The all-electron spectrum is presented and compared with models from a heliospheric numerical transport code. Article in Journal/Newspaper Ellesmere Island University of California: eScholarship The Astrophysical Journal 903 1 21 |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
CRs CR detectors Heliosphere Solar wind High altitude balloons astro-ph.HE astro-ph.IM astro-ph.SR physics.ins-det physics.space-ph Astronomical and Space Sciences Atomic Molecular Nuclear Particle and Plasma Physics Physical Chemistry (incl. Structural) Astronomy & Astrophysics |
spellingShingle |
CRs CR detectors Heliosphere Solar wind High altitude balloons astro-ph.HE astro-ph.IM astro-ph.SR physics.ins-det physics.space-ph Astronomical and Space Sciences Atomic Molecular Nuclear Particle and Plasma Physics Physical Chemistry (incl. Structural) Astronomy & Astrophysics Mechbal, Sarah Mangeard, Pierre-Simon Clem, John M Evenson, Paul A Johnson, Robert P Lucas, Brian Roth, James Measurement of Low-energy Cosmic-Ray Electron and Positron Spectra at 1 au with the AESOP-Lite Spectrometer |
topic_facet |
CRs CR detectors Heliosphere Solar wind High altitude balloons astro-ph.HE astro-ph.IM astro-ph.SR physics.ins-det physics.space-ph Astronomical and Space Sciences Atomic Molecular Nuclear Particle and Plasma Physics Physical Chemistry (incl. Structural) Astronomy & Astrophysics |
description |
We report on a new measurement of the cosmic ray (CR) electron and positron spectra in the energy range of 20 MeV -- 1 GeV. The data were taken during the first flight of the balloon-borne spectrometer AESOP-Lite (Anti Electron Sub Orbital Payload), which was flown from Esrange, Sweden, to Ellesmere Island, Canada, in May 2018. The instrument accumulated over 130 hours of exposure at an average altitude of 3 g.cm$^{-2}$ of residual atmosphere. The experiment uses a gas Cherenkov detector and a magnetic spectrometer, consisting of a permanent dipole magnet and silicon strip detectors (SSDs), to identify particle type and measure the rigidity. Electrons and positrons were detected against a background of protons and atmospheric secondary particles. The primary cosmic ray spectra of electrons and positrons, as well as the re-entrant albedo fluxes, were extracted between 20 MeV -- 1 GeV during a positive solar magnetic polarity epoch. The positron fraction below 100 MeV appears flat, suggesting diffusion dominated solar modulation at low rigidity. The all-electron spectrum is presented and compared with models from a heliospheric numerical transport code. |
format |
Article in Journal/Newspaper |
author |
Mechbal, Sarah Mangeard, Pierre-Simon Clem, John M Evenson, Paul A Johnson, Robert P Lucas, Brian Roth, James |
author_facet |
Mechbal, Sarah Mangeard, Pierre-Simon Clem, John M Evenson, Paul A Johnson, Robert P Lucas, Brian Roth, James |
author_sort |
Mechbal, Sarah |
title |
Measurement of Low-energy Cosmic-Ray Electron and Positron Spectra at 1 au with the AESOP-Lite Spectrometer |
title_short |
Measurement of Low-energy Cosmic-Ray Electron and Positron Spectra at 1 au with the AESOP-Lite Spectrometer |
title_full |
Measurement of Low-energy Cosmic-Ray Electron and Positron Spectra at 1 au with the AESOP-Lite Spectrometer |
title_fullStr |
Measurement of Low-energy Cosmic-Ray Electron and Positron Spectra at 1 au with the AESOP-Lite Spectrometer |
title_full_unstemmed |
Measurement of Low-energy Cosmic-Ray Electron and Positron Spectra at 1 au with the AESOP-Lite Spectrometer |
title_sort |
measurement of low-energy cosmic-ray electron and positron spectra at 1 au with the aesop-lite spectrometer |
publisher |
eScholarship, University of California |
publishDate |
2020 |
url |
https://escholarship.org/uc/item/8zv384dh https://doi.org/10.3847/1538-4357/abb46f |
op_coverage |
21 |
genre |
Ellesmere Island |
genre_facet |
Ellesmere Island |
op_source |
The Astrophysical Journal, vol 903, iss 1 |
op_relation |
qt8zv384dh https://escholarship.org/uc/item/8zv384dh doi:10.3847/1538-4357/abb46f |
op_rights |
public |
op_doi |
https://doi.org/10.3847/1538-4357/abb46f |
container_title |
The Astrophysical Journal |
container_volume |
903 |
container_issue |
1 |
container_start_page |
21 |
_version_ |
1810442391948099584 |