SEUSHI

Overview

SEUSHI (Solar Extreme Ultraviolet Spectrograph and High-energy Imager) combines multipinhole soft X-ray (SXR) imaging with grazing-incidence EUV spectroscopy on a shared camera. The instrument is designed to address measurement gaps for studying solar-flare and coronal-mass-ejection (CME) initiation and related space-weather early alerts. A technology-demonstration version is under development for flight on the Solar Dynamics Observatory Extreme Ultraviolet Variability Experiment (SDO-EVE) calibration sounding rocket (Woods 36.406), with instrument calibration, integration, and testing underway as noted in the CV.

Source paper: Telikicherla et al., The Astrophysical Journal, 1005, 18 (2026); DOI 10.3847/1538-4357/ae74ce; arXiv:2604.07537.

Motivation

Soft X-ray and extreme-ultraviolet observations provide critical diagnostics of the dynamic solar corona, yet significant measurement gaps remain for flare and CME initiation studies. SEUSHI targets spatially resolved hot-onset precursor diagnostics for earlier flare alerts, photon-counting SXR spectroscopy for elemental-abundance evolution in active regions, and high-resolution EUV spectra for coronal-dimming studies and early CME alerts.

Methods

Per the published instrument paper, SEUSHI’s design includes:

• Multipinhole SXR imaging to produce spatially resolved temperature and emission-measure maps (reported design goals: 1′ resolution and 5 s cadence) for identifying hot onset precursor events.
• High-cadence (100 Hz) readouts of selected image rows for photon-counting spectroscopy over 1.1–6.8 keV with ≈0.08 keV energy resolution, supporting studies of elemental abundance evolution.
• Grazing-incidence EUV spectroscopy across 16.1–33.8 nm at ≈0.2 nm spectral resolution and 5 s cadence for coronal-dimming and CME-related diagnostics.
• Low power, mass, and volume requirements intended for small-satellite platforms, with the sounding-rocket demonstration as a path toward future satellite flights.

Design, development, and preflight calibration results are documented in the ApJ paper; performance claims beyond that publication are not restated here.

Results / Objectives

Current objectives focus on completing technology demonstration on the SDO-EVE calibration rocket and validating the combined SXR imaging / EUV spectroscopy approach described in the instrument paper. Successful rocket demonstration is framed in the paper as a step toward future satellite opportunities and improved space-weather operations.

Publications

• Telikicherla et al., “SEUSHI: Solar Extreme Ultraviolet Spectrograph and High-energy Imager: Design, Development, and Preflight Calibration,” ApJ 1005, 18 (2026). DOI · PDF · arXiv

Collaborators

See collaborator list in the page frontmatter (from the SEUSHI ApJ author list).