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Proton and alpha particle precipitation onto the upper atmosphere of Venus

Research output: Contribution to Journal/Magazine › Journal article › peer-review

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Proton and alpha particle precipitation onto the upper atmosphere of Venus. / Stenberg Wieser, Gabriella; Ashfaque, M.; Nilsson, Hans et al.
In: Planetary and Space Science, Vol. 113-114, 08.2015, p. 369-377.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Harvard

Stenberg Wieser, G, Ashfaque, M, Nilsson, H, Futaana, Y, Barabash, S, Dieval, C, Fedorov, A & Zhang, T 2015, 'Proton and alpha particle precipitation onto the upper atmosphere of Venus', Planetary and Space Science, vol. 113-114, pp. 369-377. https://doi.org/10.1016/j.pss.2015.01.018

APA

Stenberg Wieser, G., Ashfaque, M., Nilsson, H., Futaana, Y., Barabash, S., Dieval, C., Fedorov, A., & Zhang, T. (2015). Proton and alpha particle precipitation onto the upper atmosphere of Venus. Planetary and Space Science, 113-114, 369-377. https://doi.org/10.1016/j.pss.2015.01.018

Vancouver

Stenberg Wieser G, Ashfaque M, Nilsson H, Futaana Y, Barabash S, Dieval C et al. Proton and alpha particle precipitation onto the upper atmosphere of Venus. Planetary and Space Science. 2015 Aug;113-114:369-377. Epub 2015 Feb 7. doi: 10.1016/j.pss.2015.01.018

Author

Stenberg Wieser, Gabriella ; Ashfaque, M. ; Nilsson, Hans et al. / Proton and alpha particle precipitation onto the upper atmosphere of Venus. In: Planetary and Space Science. 2015 ; Vol. 113-114. pp. 369-377.

Bibtex

@article{f5ca2f96b5ca4a5391f48c77617d5bdb,
title = "Proton and alpha particle precipitation onto the upper atmosphere of Venus",
abstract = "We study the precipitation of protons and alpha-particles onto the upper atmosphere of Venus, using particle data recorded by the Venus Express spacecraft inside the induced magnetosphere. Our investigations are limited to the dayside close to the terminator. We observe on average a net downward flux of protons, which originate partly from the planetary atmosphere and partly from the solar wind. We present median energy spectra of the precipitating protons divided into two energy ranges, 10–100 eV and 100 eV–30 keV. The total dayside precipitation of solar wind protons is estimated to be 3×10^22 s^−1, assuming only protons with energies above 500 eV will reach the exobase. Downgoing protons are frequently observed but only in 3% of the available data records we see He^2+. These observations are made close to the induced magnetosphere boundary and we argue that at lower altitude the countrates for alpha-particles fall below detection limits. We estimate the precipitation of He^2+ onto the dayside exobase to be 1×10^21 s^−1, which is not enough enough to replace the helium escaping from the planet.",
author = "{Stenberg Wieser}, Gabriella and M. Ashfaque and Hans Nilsson and Yoshifumi Futaana and Stas Barabash and Catherine Dieval and Andrei Fedorov and Tielong Zhang",
year = "2015",
month = aug,
doi = "10.1016/j.pss.2015.01.018",
language = "English",
volume = "113-114",
pages = "369--377",
journal = "Planetary and Space Science",
issn = "0032-0633",
publisher = "Elsevier Limited",

}

RIS

TY - JOUR

T1 - Proton and alpha particle precipitation onto the upper atmosphere of Venus

AU - Stenberg Wieser, Gabriella

AU - Ashfaque, M.

AU - Nilsson, Hans

AU - Futaana, Yoshifumi

AU - Barabash, Stas

AU - Dieval, Catherine

AU - Fedorov, Andrei

AU - Zhang, Tielong

PY - 2015/8

Y1 - 2015/8

N2 - We study the precipitation of protons and alpha-particles onto the upper atmosphere of Venus, using particle data recorded by the Venus Express spacecraft inside the induced magnetosphere. Our investigations are limited to the dayside close to the terminator. We observe on average a net downward flux of protons, which originate partly from the planetary atmosphere and partly from the solar wind. We present median energy spectra of the precipitating protons divided into two energy ranges, 10–100 eV and 100 eV–30 keV. The total dayside precipitation of solar wind protons is estimated to be 3×10^22 s^−1, assuming only protons with energies above 500 eV will reach the exobase. Downgoing protons are frequently observed but only in 3% of the available data records we see He^2+. These observations are made close to the induced magnetosphere boundary and we argue that at lower altitude the countrates for alpha-particles fall below detection limits. We estimate the precipitation of He^2+ onto the dayside exobase to be 1×10^21 s^−1, which is not enough enough to replace the helium escaping from the planet.

AB - We study the precipitation of protons and alpha-particles onto the upper atmosphere of Venus, using particle data recorded by the Venus Express spacecraft inside the induced magnetosphere. Our investigations are limited to the dayside close to the terminator. We observe on average a net downward flux of protons, which originate partly from the planetary atmosphere and partly from the solar wind. We present median energy spectra of the precipitating protons divided into two energy ranges, 10–100 eV and 100 eV–30 keV. The total dayside precipitation of solar wind protons is estimated to be 3×10^22 s^−1, assuming only protons with energies above 500 eV will reach the exobase. Downgoing protons are frequently observed but only in 3% of the available data records we see He^2+. These observations are made close to the induced magnetosphere boundary and we argue that at lower altitude the countrates for alpha-particles fall below detection limits. We estimate the precipitation of He^2+ onto the dayside exobase to be 1×10^21 s^−1, which is not enough enough to replace the helium escaping from the planet.

U2 - 10.1016/j.pss.2015.01.018

DO - 10.1016/j.pss.2015.01.018

M3 - Journal article

VL - 113-114

SP - 369

EP - 377

JO - Planetary and Space Science

JF - Planetary and Space Science

SN - 0032-0633

ER -