RHESSI Spectroscopy - OSPEX User Guide

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Contents

Introduction

A general outline that covers the steps necessary to fit a RHESSI Spectra, starting with the creation of the RHESSI Spectrum file and going through the process of defining background, time intervals, and fitting models to the data using OSPEX.

Links to documentation for fitting RHESSI Data

Creating a spectrum file with the HESSI GUI

Starting with the level zero RHESSI data this document goes through the steps necessary to create a spectrum file using the HESSI GUI.
Command Line instructions are also included. The documentation is for creating a spectrum and spectrum response matrix (SRM) file 
for a single detector, but is easily expandable  to creating files for multiple detectors. 

Users Guide for the OSPEX GUI

Using a spectrum file and SRM file this document goes through the steps necessary for using the OSPEX GUI to fit a RHESSI spectrum,
including defining background, time intervals, a fit model and doing a fit. 

Vth - Variable Thermal

The variable thermal fit model component uses a single emission measure and temperature along with a measure of the relative abundance
of the Fe-Ni line complex to fit the thermal emission of the RHESSI spectrum for a user defined time interval.

Bpow - Broken Power law

The broken power law fit model component uses a break energy, the spectral index above and below the break energy, and a normalization
dependent on the count rate to fit the non-thermal component of the RHESSI spectrum for a user defined time interval. This is the 
simplest model available for the non-thermal emission during a flare.  

Thick Target

The thick target fit model component uses a double broken power law in electron space to model to non-thermal portion of the RHESSI
spectrum. The measured photon distribution is calculated from the electron distribution using 

drm_mod

 drm_mod

pileup_mod

 pileup_mod

Fitting Multiple Intervals

Fitting multiple intervals

View Fit Results

View fit results

Fitting a new detector

Fitting a new detector


'UNDER CONSTRUCTION'

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