E-Print Archive

There are 4559 abstracts currently viewable.


Search:

Advanced Search
Options
Main Page Add New E-Print Submitter
Information
Feedback
News Help/FAQ About Preferences
Manage Key Phrase
Notification
Hard X-Ray Imaging of Individual Spectral Components in Solar Flares View all abstracts by submitter

Amir Caspi   Submitted: 2015-09-11 18:37

We present a new analytical technique, combining Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) high-resolution imaging and spectroscopic observations, to visualize solar flare emission as a function of spectral component (e.g., isothermal temperature) rather than energy. This computationally inexpensive technique is applicable to all spatially-invariant spectral forms and is useful for visualizing spectroscopically-determined individual sources and placing them in context, e.g., comparing multiple isothermal sources with nonthermal emission locations. For example, while extreme ultraviolet images can usually be closely identified with narrow temperature ranges, due to the emission being primarily from spectral lines of specific ion species, X-ray images are dominated by continuum emission and therefore have a broad temperature response, making it difficult to identify sources of specific temperatures regardless of the energy band of the image. We combine RHESSI calibrated X-ray visibilities with spatially-integrated spectral models including multiple isothermal components to effectively isolate the individual thermal sources from the combined emission and image them separately. We apply this technique to the 2002 July 23 X4.8 event studied in prior works, and image for the first time the super-hot and cooler thermal sources independently. The super-hot source is farther from the footpoints and more elongated throughout the impulsive phase, consistent with an in situ heating mechanism for the super-hot plasma.

Authors: Amir Caspi, Albert Y. Shih, James M. McTiernan, Säm Krucker
Projects: RHESSI

Publication Status: Published -- Caspi, A., Shih, A. Y., McTiernan, J. M., & Krucker, S. 2015, ApJL, 811, L1; DOI 10.1088/2041-8205/811/1/L1
Last Modified: 2015-09-14 16:10
Go to main E-Print page  Application of Kernel Based Machine Learning to Inversion Problem of Photospheric Magnetic Fields  Model comparison for the density structure across solar coronal waveguides  Edit Entry  Download Preprint  Delete Entry 

Key
Go to main E-Print pageGo to main E-Print page.
Previous AbstractPrevious Abstract.
Next AbstractNext Abstract.
Download PreprintDownload Preprint.
Submitter's HomepageSubmitters Homepage.
Edit EntryEdit Entry.
View All Abstracts By SubmitterView all abstracts by submitter.
Delete AbstractDelete abstract.

Latest Entries
Comparison of solar activity proxies: eigenvectors versus averaged sunspot numbers
A comparative study of resistivity models for simulations of magnetic reconnection in the solar atmosphere
Links of Terrestrial Volcanic Eruptions to Solar Activity and Solar Magnetic Field
Periodicities in Solar Activity, Solar Radiation and Their Links with Terrestrial Environment
Transverse vertical oscillations during the contraction and expansion of coronal loops
New Evidence on the Origin of Solar Wind Microstreams/Switchbacks
The Merging of a Coronal Dimming and the Southern Polar Coronal Hole
Complete replacement of magnetic flux in a flux rope during a coronal mass ejection
The SunPy Project: An Interoperable Ecosystem for Solar Data Analysis
Evidence of external reconnection between an erupting mini-filament and ambient loops observed by Solar Orbiter/EUI
Ultra-high-resolution Observations of Persistent Null-point Reconnection in the Solar Corona
The Evolution of Plasma Composition During a Solar Flare
The efficiency of electron acceleration during the impulsive phase of a solar flare
Evolution of Solar Eruptive Events: Investigating the Relationships Among Magnetic Reconnection, Flare Energy Release, and Coronal Mass Ejections
Solar Radio Spikes and Type IIIb Striae Manifestations of Sub-second Electron Acceleration Triggered by a Coronal Mass Ejection
Statistical study of Type III bursts and associated HXR emissions
On orbit performance of the solar flare trigger for the Hinode EUV Imaging Spectrometer
Plasma Composition Measurements in an Active Region from Solar Orbiter/SPICE and Hinode/EIS
Modulation of cosmic ray anti-protons in the heliosphere: simulations for a solar cycle
Temporal and spatial association between microwaves and type III bursts in the upper corona

Related Pages
MSU Solar Physics.
Max Millennium Science Mail Archive.
Max Millennium Message of the Day Mail Archive.
Max Millennium Flare Catalog

Archive Maintainer
Alisdair Davey



© 2000-2020 Solar Physics Group - Montana State University