The Solar Orbiter SPICE instrument - An extreme UV imaging spectrometer |
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Daniel Mueller Submitted: 2019-09-12 08:26
The Spectral Imaging of the Coronal Environment (SPICE) instrument is a high-resolution imaging spectrometer operating at extreme ultraviolet (EUV) wavelengths. In this paper, we present the concept, design, and pre-launch performance of this facility instrument on the ESA/NASA Solar Orbiter mission. The goal of this paper is to give prospective users a better understanding of the possible types of observations, the data acquisition, and the sources that contribute to the instrument's signal. The paper discusses the science objectives, with a focus on the SPICE-specific aspects, before presenting the instrument's design, including optical, mechanical, thermal, and electronics aspects. This is followed by a characterisation and calibration of the instrument's performance. The paper concludes with descriptions of the operations concept and data processing. The performance measurements of the various instrument parameters meet the requirements derived from the mission's science objectives. The SPICE instrument is ready to perform measurements that will provide vital contributions to the scientific success of the Solar Orbiter mission.
Authors: The SPICE Consortium
Projects: None
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Publication Status: Accepted for publication by A&A
Last Modified: 2019-09-12 13:21
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JHelioviewer - Time-dependent 3D visualisation of solar and heliospheric data |
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Daniel Mueller Submitted: 2017-05-23 11:22
Context.
Solar observatories are providing the world-wide community with a wealth of data, covering large time ranges (e.g. SOHO), multiple viewpoints (STEREO), and returning large amounts of data (SDO). In particular, the large volume of SDO data presents challenges: it is available only from a few repositories, and full-disk, full-cadence data for reasonable durations of scientific interest are difficult to download practically due to their size and download data rates available to most users. From a scientist's perspective this poses three problems: accessing, browsing and finding interesting data as efficiently as possible.
Aims.
To address these challenges, we have developed JHelioviewer, a visualisation tool for solar data based on the JPEG2000 compression standard and part of the open source ESA/NASA Helioviewer Project. Since the first release of JHelioviewer, the scientific functionality of the software has been extended significantly, and the objective of this paper is to highlight these improvements.
Methods.
The JPEG2000 standard offers useful new features that facilitate the dissemination and analysis of high-resolution image data and offers a solution to the challenge of efficiently browsing petabyte-scale image archives. The JHelioviewer software is open source, platform independent and extendable via a plug-in architecture.
Results.
With JHelioviewer, users can visualise the Sun for any time period between September 1991 and today. They can perform basic image processing in real time, track features on the Sun and interactively overlay magnetic field extrapolations. The software integrates solar event data and a time line display. Once an interesting event has been identified, science quality data can be accessed for in-depth analysis. As a first step towards supporting science planning of the upcoming Solar Orbiter mission, JHelioviewer offers a virtual camera model that enables users to set the vantage point to the location of a spacecraft or celestial body at any given time.
Authors: D. Mueller, B. Nicula, S. Felix, F. Verstringe, B. Bourgoignie, A. Csillaghy, D. Berghmans, P. Jiggens, J. P. Garcia-Ortiz, J. Ireland, S. Zahniy, B. Fleck
Projects: None
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Publication Status: accepted for publication in A&A
Last Modified: 2017-05-24 14:22
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JHelioviewer - Visualizing large sets of solar images using JPEG 2000 |
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Daniel Mueller Submitted: 2009-06-08 13:43
Across all disciplines that work with image data - from astrophysics to medical research and historic preservation - there is a growing need for efficient ways to browse and inspect large sets of high-resolution images. We present the
development of a visualization software for solar physics data based on the JPEG 2000 image compression standard. Our implementation consists of the JHelioviewer client application that enables users to browse petabyte-scale image archives and the JHelioviewer server, which integrates a JPIP server, metadata catalog and an event server. JPEG 2000 offers many useful new features and has the potential to revolutionize the way high-resolution image data are disseminated and analyzed. This is especially relevant for solar physics, a research field in which upcoming space missions will provide more than a terabyte of image data per day. Providing efficient access to such large data volumes at both high spatial and high time resolution is of paramount importance to support scientific discovery.
Authors: Daniel Mueller, George Dimitoglou, Benjamin Caplins, Juan Pablo Garcia Ortiz, Benjamin Wamsler, Keith Hughitt, Alen Alexanderian, Jack Ireland, Desmond Amadigwe, Bernhard Fleck
Projects: SoHO-EIT,SoHO-MDI,SoHO-LASCO
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Publication Status: accepted for publication in Computing in Science & Engineering
Last Modified: 2009-06-09 02:30
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