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<p><strong>Dependence of X-ray emission from Europa on solar activity cycle</strong></p>

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Title Statement <p><strong>Dependence of X-ray emission from Europa on solar activity cycle</strong></p>
 
Added Entry - Uncontrolled Name BRIGHT, SMART KUNDASSERY; Research Scholar, Department of Atmospheric Sciences, School of Marine Sciences, Cochin University of Science and Technology,
Babu, C A ; Department of Atmospheric Sciences, School of Marine Sciences, Cochin University of Science and Technology,
COCHIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
 
Uncontrolled Index Term SPACE PHYSICS, PLANETARY PHYSICS
Solar corona; Europa; Tenuous; Exosphere; X-ray fluorescence; Rayleigh scattering
 
Summary, etc. The atmosphere of the Jovian Europa being tenuous, the interaction of the energetic solar photons is a probable source of excitation for the emission of X-rays from the surface of the satellite. Solar photons in the X-region of the electromagnetic spectrum have energies greater than the binding energy of the elemental constituents of the surface, cause excitation of electrons, and on de-excitation cause emission of X-rays through X-ray fluorescence. We developed models for the computation of the solar X-ray flux during the representative phases of a solar activity cycle (1-100 Å), and using these fluxes, we computed the photon-induced X-ray fluorescent and Rayleigh scattering emission flux from the regolith of the<br />Europa by taking into account its predominant H2O ice composition. This work observed that during the extreme case of the quiet Sun condition and an X2-class flare, the X-ray energy flux at the Europa distance of 4.96 AU vary from 1.08 × 10-7 to 5.23 × 10-4 ergs-cm-2s-1. This flux from the H2O ice composition can generate a total X-ray energy flux, inclusive of the X-ray fluorescent and Rayleigh scattering events, varying as 1.40 × 10-23 to 6.21 × 10-20 ergs-cm-2s-1. These computed numbers of the X-ray energy fluxes at the telescope of the Chandra X-ray Observatory are of lesser magnitude in comparison to its observed numbers (3.0 × 10-16). This deduction reveals the influence of a stronger excitation source than the photon-induced mechanisms of the generation of X-rays from the surface of the Europa.
 
Publication, Distribution, Etc. Indian Journal of Pure & Applied Physics (IJPAP)
2022-01-17 13:37:25
 
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http://op.niscair.res.in/index.php/IJPAP/article/view/57540
 
Data Source Entry Indian Journal of Pure & Applied Physics (IJPAP); ##issue.vol## 60, ##issue.no## 1 (2022): Indian Journal of Pure & Applied Physics
 
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