Characterization of Solar Wind Charge Exchange with Suzaku

Abstract : The Solar Wind Charge Exchange (SWCX) is one of the major contributors to the X-ray emission in the [0.3-0.9] keV band and possibly the strongest local component. SWCX is characterized by emission lines, however its intensity shows both temporal and spatial variations as it depends on the solar activity and on the relative positioning between the observer, the Sun, and the line of sight. SWCX is due to the interaction of the solar wind with neutrals and it is the superposition of two components, magnetosheat and heliospheric. The first one is varying on a very short time scale of hours to days, due to the interaction of solar wind with neutrals in our atmosphere, and can have very strong emission bursts. The second one is on average the dominant component. It varies more smoothly on a time scale of several days to months, due to the diffusion time of the wind through the solar system. An annual modulation due to distributions of interstellar neutrals (H and He) passing through the solar system is also present. The heliospheric emission is the focus of a Suzaku key project. Nearby 100 pc) high column density clouds absorb the X-ray contribution from distant sources and the leftover signal has local origin (and is expected to be dominated by SWCX). The project consists of a three year monitoring campaign of four high density clouds. Besides the high density the targets have been selected for their position in the sky, in order to maximize the latitude and longitude range and to model how SWCX depends on the distribution of neutrals. Three of the targets will be therefore observed once a year in order to characterize how SWCX depends on the solar wind (long term dependence). The fourth target will be observed twice a year, this allows to study also the annual modulation of SWCX. The targets shows a significant variation between the two Suzaku’s observing windows because the pointing partially goes through the He focusing cone in one window, but is far from it in the other. Here we present the preliminary results on the data taken during the first year of the project.
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https://hal.archives-ouvertes.fr/hal-02325942
Contributor : Dimitra Koutroumpa <>
Submitted on : Tuesday, October 22, 2019 - 1:20:39 PM
Last modification on : Friday, January 10, 2020 - 3:42:33 PM

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Eugenio Ursino, M. Galeazzi, T. Cravens, Dimitra Koutroumpa, K. D. Kuntz, et al.. Characterization of Solar Wind Charge Exchange with Suzaku. HEAD Thirteenth Divisional Meeting, Apr 2013, Monterey, United States. ⟨hal-02325942⟩

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