# The soft X-ray spectrometer polarimeter SolpeX

## TL;DR

The SolpeX instrument suite is a novel combination of X-ray spectrometer, imager, and polarimeter designed to measure solar flare spectra and polarization from the ISS, providing new insights into flare physics.

## Contribution

It introduces a new integrated X-ray instrument assembly (SolpeX) with three blocks for detailed solar flare spectral and polarization measurements from space.

## Key findings

- Design and construction details of SolpeX blocks
- Expected capability to measure X-ray polarization in solar flares
- Anticipated spectral Doppler shifts during flares

## Abstract

We present a novel X-ray assembly of functionally related instrument blocks intended to measure solar flare and active region (AR) spectra from within the Russian instrument complex KORTES, to be mounted aboard the International Space Station (ISS). SolpeX consists of three blocks: fast-rotating multiple flat crystal Bragg spectrometer, pin-hole X-ray spectral imager and Bragg polarimeter. This combination of measuring blocks will offer an opportunity to detect/measure possible X-ray polarization in soft X-ray emission lines/continuum and record spectra of solar flares, in particular during their impulsive phases. Polarized Bremsstrahlung and line emission may arise from presence of directed particle beams colliding with denser regions of flares. As a result of evaporation, the X-ray spectral-components are expected to be Doppler shifted, which will also be measured. In this paper, we present details of the construction of three SolpeX blocks and discuss their functionality. Delivery of KORTES with SolpeX to ISS is expected in 2020/2021.