The HEXITEC hard x-ray pixelated CdTe imager for fast solar observations

2016 ◽  
Author(s):  
Wayne H. Baumgartner ◽  
Steven D. Christe ◽  
Daniel F. Ryan ◽  
Andrew R. Inglis ◽  
Albert Y. Shih ◽  
...  
Keyword(s):  
X Ray ◽  
Solar Observations

scholarly journals Stellar activity and coronal heating: an overview of recent results

2015 ◽  
Vol 373 (2042) ◽  
pp. 20140259 ◽  
Author(s):  
Paola Testa ◽  
Steven H. Saar ◽  
Jeremy J. Drake
Keyword(s):  
Magnetic Activity ◽  
Coronal Heating ◽  
Complementary Information ◽  
Stellar Activity ◽  
X Ray ◽  
Solar Observations ◽  
Term Evolution ◽  
Wide Range ◽  
Stellar Magnetic Fields

Observations of the coronae of the Sun and of solar-like stars provide complementary information to advance our understanding of stellar magnetic activity, and of the processes leading to the heating of their outer atmospheres. While solar observations allow us to study the corona at high spatial and temporal resolution, the study of stellar coronae allows us to probe stellar activity over a wide range of ages and stellar parameters. Stellar studies therefore provide us with additional tools for understanding coronal heating processes, as well as the long-term evolution of solar X-ray activity. We discuss how recent studies of stellar magnetic fields and coronae contribute to our understanding of the phenomenon of activity and coronal heating in late-type stars.

scholarly journals The Needs and Requirements from the Standpoint of the Ultraviolet Solar Observations

1968 ◽  
Vol 1 ◽  
pp. 538-540
Author(s):  
E.M. Reeves
Keyword(s):  
Spatial Resolution ◽  
Time Resolution ◽  
Solar Disk ◽  
Emission Lines ◽  
High Time Resolution ◽  
The Sun ◽  
X Ray ◽  
Solar Observations ◽  
Partial Success

Extending from the present to the early part of 1969 there are three Orbiting Solar Observatories to be launched, and these will all be capable of constructing spectroheliograms of the Sun in solar emission lines of the EUV and X-ray region. The recently launched and highly successful OSO-III has obtained EUV and X-ray spectra with high-time resolution, but without spatial resolution on the solar disk. The later OSO satellites will provide spatial resolution of 1′ of arc to 30″ of arc, and will provide the basis for the extension to even higher spatial resolution in the future.The comparatively short periods covered by these satellites, coupled with a real probability of only partial success, make it particularly important to obtain the fullest possible use of the data by implementing a complementary and simultaneous series of ground-based observations.

scholarly journals Observations of stellar coronae

1987 ◽  
Vol 122 ◽  
pp. 333-345 ◽  
Author(s):  
G. S. Vaiana ◽  
S. Sciortino
Keyword(s):  
Magnetic Field ◽  
Unsolved Problem ◽  
Evolutionary Stage ◽  
Related Activity ◽  
Coronal Emission ◽  
X Ray ◽  
Surface Magnetic Field ◽  
Solar Observations ◽  
Field Activity ◽  
Early Type Stars

We present an overview of recent stellar X-ray observations, with some discussion of the requirements for future observations. We argue that solar observations indicate that coronal X-ray emission is strongly related to surface magnetic field activity; we show that the interpretation of X-ray stellar coronal emission from late-type stars within the framework of models analogous to those developed for the solar corona is viable, and it is supported by many experimental results. The extension of this solar analogy to the early-type stars is quite questionable and remains an unsolved problem, while the working hypothesis of an X-ray phase, related to phenomena of magnetic field-related activity, as contrasted to a wind phase during the PMS evolutionary stage is suggested by the present status of observations.

VI. The Sun as a Star

1988 ◽  
Vol 20 (1) ◽  
pp. 102-106
Author(s):  
L.E. Cram
Keyword(s):  
Time Scales ◽  
Spatial Extent ◽  
The Sun ◽  
Distinguishing Characteristic ◽  
X Ray ◽  
Spatially Resolved ◽  
Solar Observations ◽  
The Earth ◽  
The Subject

Studies of the global (spatially unresolved) output from the sun are important for two main reasons: (1) the global solar output directed towards the earth plays a central role in solar-terrestrial relations, and (2) global solar observations form a link between (neccessarily) global observations of stars and the more refined spatially resolved observations which are available for the sun. This report covers both aspects (insofar as they concern the sun), using the time-scales of various phenomena as a basic distinguishing characteristic. Note that certain studies of spatially unresolved solar output have not been discussed, since they are actually directed toward the investigation of phenomena of strictly limited spatial extent [e.g. radiospectrograph observations (e.g. Wiehl et al. 1985) and studies of X-ray bursts (e.g. Thomas et al. 1985)]. Collections of relevant papers may be found in De Jager and Svestka (1985) and Labonte et al. (1984), while a review of germane stellar work is available in Baliunas and Vaughan (1985) and solar-terrestrial work in Donnelly and Heath (1985). A comprehensive summary of the subject by Hudson will appear soon in Review of Geophysics and Planetary Physics.

scholarly journals High-speed X-ray imaging spectroscopy system with Zynq SoC for solar observations

2018 ◽  
Vol 912 ◽  
pp. 191-194 ◽  
Author(s):  
Shin-nosuke Ishikawa ◽  
Tadayuki Takahashi ◽  
Shin Watanabe ◽  
Noriyuki Narukage ◽  
Satoshi Miyazaki ◽  
...  
Keyword(s):  
High Speed ◽  
Imaging Spectroscopy ◽  
X Ray ◽  
Solar Observations ◽  
X Ray Imaging ◽  
Spectroscopy System

Track membranes with open pores used as diffractive filters for space-based x-ray and EUV solar observations

2009 ◽  
Vol 48 (5) ◽  
pp. 834 ◽  
Author(s):  
Marie Dominique ◽  
A. V. Mitrofanov ◽  
J.-F. Hochedez ◽  
P. Yu. Apel ◽  
U. Schühle ◽  
...  
Keyword(s):  
X Ray ◽  
Solar Observations ◽  
Track Membranes

A DEFT Way to Forecast Solar Flares

2021 ◽  
Vol 922 (2) ◽  
pp. 218
Author(s):  
Larisza D. Krista ◽  
Matthew Chih
Keyword(s):  
Space Weather ◽  
Solar Flares ◽  
Extreme Ultraviolet ◽  
Weather Forecast ◽  
Start Time ◽  
X Ray ◽  
Solar Observations ◽  
Solar Eruptions ◽  
Intensity Changes ◽  
Solar Ultraviolet

Abstract Solar flares have been linked to some of the most significant space weather hazards at Earth. These hazards, including radio blackouts and energetic particle events, can start just minutes after the flare onset. Therefore, it is of great importance to identify and predict flare events. In this paper we introduce the Detection and EUV Flare Tracking (DEFT) tool, which allows us to identify flare signatures and their precursors using high spatial and temporal resolution extreme-ultraviolet (EUV) solar observations. The unique advantage of DEFT is its ability to identify small but significant EUV intensity changes that may lead to solar eruptions. Furthermore, the tool can identify the location of the disturbances and distinguish events occurring at the same time in multiple locations. The algorithm analyzes high temporal cadence observations obtained from the Solar Ultraviolet Imager instrument aboard the GOES-R satellite. In a study of 61 flares of various magnitudes observed in 2017, the “main” EUV flare signatures (those closest in time to the X-ray start time) were identified on average 6 minutes early. The “precursor” EUV signatures (second-closest EUV signatures to the X-ray start time) appeared on average 14 minutes early. Our next goal is to develop an operational version of DEFT and to simulate and test its real-time use. A fully operational DEFT has the potential to significantly improve space weather forecast times.

scholarly journals New Results from the Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) Mission

2004 ◽  
Vol 219 ◽  
pp. 41-54
Author(s):  
R. P. Lin
Keyword(s):  
Gamma Ray ◽  
Imaging Spectroscopy ◽  
High Energy ◽  
High Resolution Spectroscopy ◽  
X Ray ◽  
Solar Observations ◽  
X Ray Imaging ◽  
Explorer Mission ◽  
Electrons And Ions ◽  
Imaging And Spectroscopy

The primary scientific objective of RHESSI Small Explorer mission is to investigate the physics of particle acceleration and energy release in solar flares, through imaging and spectroscopy of X-ray/gamma-ray continuum and gamma-ray lines emitted by accelerated electrons and ions, respectively. Here we briefly describe the mission and summarize the new solar observations, including the first hard X-ray imaging spectroscopy, the first high resolution spectroscopy of solar gamma-ray lines, and the first imaging of solar gamma-ray lines and continuum.

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