HESSI Lightcurve Widget

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Lightcurve Parameters        Snapshot of Lightcurve Widget

     Selecting Time Interval

       Snapshot of Lightcurve Plot Example
     Selecting Energy Intervals    
     Selecting Collimators    
Making a Lightcurve    

Cross Reference Table for Widget Names and Object Parameters




The HESSI Lightcurve Widget is a graphical interface to the HESSI lightcurve object. The object and the interface are connected closely; the interface provides an easy way to set parameters in the object and call the process method of the object to generate a lightcurve.

This document describes how to use the widgets to set parameters, but will not attempt to explain the process of producing  a lightcurve.  Refer to ?

This widget is activated when you click File / 'Retrieve/Process Data' / Lightcurve in the Main GUI Window.   


Lightcurve Parameters

When you first enter the Lightcurve Widget, the lightcurve parameters are set to the generic lightcurve defaults, except for the time interval which is set to the observation time interval you selected.

When you change any of the lightcurve parameters, they are set in the lightcurve object, and are remembered the next time you enter the lightcurve widget.  Note:  even if you select a new flare, the lightcurve parameters are not set to defaults, but are remembered as you last set them (except for the time interval).  You can reset the parameters to defaults by clicking the 'Reset to defaults' button.

Refer to the Overview of the HESSI Command Line Interface for a complete description of the lightcurve parameters. Below is a cross-reference table showing the object control parameter names corresponding to the names in the widgets.

Changing most of the parameters is straightforward.  The ones that aren't are described below.

Selecting Time Interval

To select the time interval over which the lightcurve will be made, click the Time Interval Change button on the Lightcurve Widget.   The time interval must be contained within the observation time interval you have selected.

Selecting Energy Bands

You may select one or multiple energy bands over which to make the lightcurve.  To change or delete the energy band currently displayed in the droplist widget, click Change or Delete.  To add another energy band, click the 'Add new' button.  The energy bands that are displayed in the droplist are automatically sorted according to the start of the energy band.

Selecting Collimators

To change collimator options, click the Change button in the collimator box. 

The default is to sum over all selected collimators.  If you choose not to sum over collimators, then only one energy band  (the first in the droplist) will be accumulated.

Making a Lightcurve

Click 'Plot Lightcurve' to accumulate and plot the lightcurve.  Once plotted, use the XY Plot Display Options under the Plot_Control pull-down menu in the main GUI to alter the display.  For example, if you selected multiple energy bands, the XY Plot Options widget lets you select a subset of the energy bands to plot separately.

Each plot that you create is saved as a plot panel in the main HESSI GUI, called
HESSI Lightcurve dd-mmm-yyyy hh:mm:ss (HH:MM:SS)
where dd-mmm-yyyy hh:mm:ss is the start time of the data in the plot, and (HH:MM:SS) is the time you generated the plot.  You can restore these plots or display multiple plots simultaneously by using the Window_Control pull-down menu in the main GUI.



Table 1.   Lightcurve Widget Names Cross-Referenced to Object Parameter Names

Widget Name Object Parameter Name
Lightcurve Time Interval obs_time_interval, time_range
Energy Band ltc_energy_band
Collimator seg_index_mask
Sum Detectors sum_flag
Time Resolution ltc_time_resolution



Last updated 07 November, 2008 by Kim Tolbert , 301-286-3965