x-Raying the Dark Side of Venus—scatter From Venus’ Magnetotail?

Afshari, M.; Peres, G.; Jibben, Patricia R.; Petralia, Antonino; Reale, F.; Weber, Mark

doi:10.3847/0004-6256/152/4/107

“…This effect has also been observed in Ref. [60], where it is used for the calibration of the telescope's point spread function. As a result it becomes necessary to remove the outermost parts of the signal region in our analysis.…”

Section: Analyzing the Eclipsesupporting

confidence: 64%

$A'$ view of the sunrise: Boosting helioscopes with angular information

Jonas¹,

Kahlhoefer²,

Schmidt-Hoberg³

2022

Preprint

0

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The Sun may copiously produce hypothetical light particles such as axions or dark photons, a scenario which can be experimentally probed with so-called helioscopes. Here we investigate the impact of the angular and spectral distribution of solar dark photons on the sensitivity of such instruments. For the first time we evaluate this spectral and angular dependence of the dark photon flux over the whole mass range and apply this information to existing data from the Hinode Solar X-Ray Telescope. Specifically we use calibration images for a classical helioscope analysis as well as data from a solar eclipse providing sensitivity to exceptionally large oscillation lengths. We demonstrate that exploiting the signal features can boost the constraints by more than one order of magnitude in terms of the mixing parameter compared to a naive counting experiment.

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“…This effect has also been observed in ref. [61], where it is used for the calibration of the telescope's point spread function. As a result it becomes necessary to remove the outermost parts of the signal region in our analysis.…”

Section: Analyzing the Eclipsementioning

confidence: 99%

A' view of the sunrise: boosting helioscopes with angular information

Jonas

¹

,

Kahlhoefer²,

Schmidt-Hoberg³

2023

J. Cosmol. Astropart. Phys.

1

0

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The Sun may copiously produce hypothetical light particles such as axions or dark photons, a scenario which can be experimentally probed with so-called helioscopes. Here we investigate the impact of the angular and spectral distribution of solar dark photons on the sensitivity of such instruments. For the first time we evaluate this spectral and angular dependence of the dark photon flux over the whole mass range and apply this information to existing data from the Hinode Solar X-Ray Telescope. Specifically we use calibration images for a classical helioscope analysis as well as data from a solar eclipse providing sensitivity to exceptionally large oscillation lengths. We demonstrate that exploiting the signal features can boost the constraints by more than one order of magnitude in terms of the mixing parameter compared to a naive counting experiment.

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“…For the XRT observations, we calibrate the images using a procedure (xrt prep.pro) in SolarSoft (Kobelski et al 2014). Then, we deconvolve the calibrated images using a point spread function supplied by the XRT team (Afshari et al 2016). We exclude the pixels that show contamination spots, which are spot-like patterns over the CCD that accumulated after the second bakeout on 3 September 2007 (see details Narukage et al 2011).…”

Section: Observationsmentioning

confidence: 99%

Heating of an Erupting Prominence Associated with a Solar Coronal Mass Ejection on 2012 January 27

Lee

¹

,

Raymond

²

,

Reeves

³

et al. 2017

ApJ

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We investigate the heating of an erupting prominence and loops associated with a coronal mass ejection and X-class flare. The prominence is seen in absorption in EUV at the beginning of its eruption. Later the prominence changes to emission, which indicates heating of the erupting plasma. We find the densities of the erupting prominence using the absorption properties of hydrogen and helium in different passbands. We estimate the temperatures and densities of the erupting prominence and loops seen as emission features using the differential emission measure method, which uses both EUV and X-ray observations from the Atmospheric Imaging Assembly on board Solar Dynamics Observatory and the X-ray Telescope on board Hinode. We consider synthetic spectra using both photospheric and coronal abundances in these calculations. We verify the methods for the estimation of temperatures and densities for the erupting plasmas. Then we estimate the thermal, kinetic, radiative loss, thermal conduction, and heating energies of the erupting prominence and loops. We find that the heating of the erupting prominence and loop occurs strongly at early times in the eruption. This event shows a writhing motion of the erupting prominence, which may indicate a hot flux rope heated by thermal energy release during magnetic reconnection.

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x-Raying the Dark Side of Venus—scatter From Venus’ Magnetotail?

Cited by 6 publications

References 20 publications

$A'$ view of the sunrise: Boosting helioscopes with angular information

$A'$ view of the sunrise: Boosting helioscopes with angular information

A' view of the sunrise: boosting helioscopes with angular information

Heating of an Erupting Prominence Associated with a Solar Coronal Mass Ejection on 2012 January 27

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