Analysis of the IBEX-Lo interstellar hydrogen fluxes collected in 2009–2018 as a tool for sensing of the solar radiation pressure and the hydrogen ionization rate

Katushkina, O A; Galli, A.; Izmodenov, V V; Alexashov, D B (2021). Analysis of the IBEX-Lo interstellar hydrogen fluxes collected in 2009–2018 as a tool for sensing of the solar radiation pressure and the hydrogen ionization rate. Monthly notices of the Royal Astronomical Society, 501(2), pp. 1633-1643. Oxford University Press 10.1093/mnras/staa3780

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The Interstellar Boundary Explorer (IBEX) has been measuring interstellar hydrogen fluxes at 1 au since 2009. In this paper,we analysed all available data obtained with the IBEX-Lo instrument at energies 11–41 eV using our numerical kinetic modelof the interstellar hydrogen distribution in the heliosphere. We performed a fitting of the data to find independently the modelparameters: the ratio of the solar radiation pressure to the solar gravitation (μ0), ionization rate of hydrogen atoms at 1 au(β0), parameters of the secondary interstellar atoms at 70 au from the Sun, which provide the best agreement with the data byminimization of metricχ2. We also analysed temporal variations of the ratio of the fluxes measured in a fixed direction at energybin 1 and energy bin 2. It is found that in 2009–2011 and 2017–2016 the ratio provided by the model is smaller than in the IBEX-Lo data, while in 2012–2015, oppositely, the model ratio is larger compared to the data. This might be caused by the incorrectseparation of the measured fluxes between energy channels in the data, or by some additional physical factors that are omitted inthe model. Understanding this issue may be important for the preparation of future Interstellar Mapping and Acceleration Probemission. At this stage, we relied on the sum of the fluxes measured in energy bins 1 and 2 for comparison to model predictions.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences
08 Faculty of Science > Physics Institute

UniBE Contributor:

Galli, André

Subjects:

500 Science > 520 Astronomy
600 Technology > 620 Engineering

ISSN:

0035-8711

Publisher:

Oxford University Press

Language:

English

Submitter:

Dora Ursula Zimmerer

Date Deposited:

25 Feb 2021 11:11

Last Modified:

25 Feb 2021 11:11

Publisher DOI:

10.1093/mnras/staa3780

BORIS DOI:

10.48350/152534

URI:

https://boris.unibe.ch/id/eprint/152534

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