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QSAS: Science Analysis Software for Space Plasmas

QSAS current version is 3.4.1

Both Windows and Macintosh versions are complete and self contained. It is no longer necessary to install QT5 or CDF. However, older versions of the operating system may block the running of a newer binary. If you cannot locate a version that works for your OS please contact QSAS Support .

Downloads:  https://sourceforge.net/projects/qsas

QSAS version 3.4.1

• Minor bug fixes
  
• time tags could shift on join if not centre of interval
• Badly formed metadata handled more safely
  

QSAS version 3.4.0

• Colour tables for spectra
  
• Editor now uses plplot for colours to better match actual spectrogrammes
• Added sample colour table in default profile to show differences in colour interpolation with RGB vs HSV
  
• Added Inferno colour table (recommended for red/green colour blind users)
• New version to install anywhere (for users without Admin privilege)
  

QSAS version 3.3.9

• Addition & Subtraction
  
• Allow handling of single time
  
• Improve handling of sequence with single value
• Provides alternative Mac application script to launch from /Users/thisUser/Applications/QSAS_3_3
  

QSAS version 3.3.8

• Fix crash when doing copy/paste on some Black Boxes in the calculator
  
• Fix issue with axis labels disappearing in some cases
  

QSAS version 3.3.7

• Add ability to plot y-error bars on TS and XY trace plots
• Improvements to save to PDF and Print on Windows and MacOS (to work on both MacS 10.xx and MacOS 11.xx)
• Minor version 3.3.7.1 fixes a persistent problem with disappearing text in plot
  

• Fixes plot Event text disappearing in some cases when Shade Interval is also present
• Fixes default jpg resolution
• Fixes clipping of SVG plot save in Lanscape
• Improves Font sizes in print and save as PDF (Mac OS)
  

QSAS version 3.3.5

• Adds the ability to shade regions in a plot using a new plot item "Shade Interval"
• Adds a new time operation to turn two time intervals into an event
• Minor bug fixes
  

• Fix a bug in 'centre timetags on import' option
  
• Improve Linux distribution build script and readme file

QSAS version 3.3.3

• Fix a minor bug in averageing down all the dimensions of an array to a scalar
• Improve feedback in time interval widget when the interval is negative
  

• Improve identification of Angle dependencies in PSD tool
• Improve handling of changes to font size in profiles
  
• Fixed an obscure bug in unit handling for division by an integer
  

• 4 New Plugins
• Update Rotation to use the latest (2020) DGRF/IGRF field models (for GSM)
  
• Added ability to subsequence series without timetags
  
• Fixed an obscure bug in addition for the specific case of a single array and a sequence of scalars
  

• Fix save/restore calculator bug with = or == in input field
• Fix empty legend text box on restore when Auto-legend is selected
• Improved error message handling in calculator

QSAS version 3.3.0

• Toggle on WL to force DEPEND_0 (usually timetags) to be centre values
• Updated to latest plplot
• Updated to latest CDF
• Updated to latest Qt
• Default reduction from both 2D and 4D arrays (set via profile)
• Exponent label y-offset now positive outward from axis on left and right axes (plots in savesets may need updating)
• Calculator operations now accept int input to float operations (e.g. 1 is cast to 1.0)
• More control over QSAS windows in User Profiles (fonts, sizes, default states)
• Improved Event mask in plot
• Allow time subset from event list/event in slot subsample.
• Time subsample windows remember event or event list dropped in
  
• Spacecraft tetrahedron plugin:    
  
• recentre box to centre of tetrahedron
  
• Add projections and transparency
• Scaled S/C cubes assuming viewing distance is box  width + height + depth
• Control over aspect ratio (range of 0.8 to 1.2)

• Bug Fixes in Join
  
• Improved Auto-labels in plot
  
• Improved error messages in Calculator
• Fix spectrogram Y data slot crash
• Improve handling of header files in data import
• Improved handling of MMS data files
• Improved handling of very small data values
• Other minor interface fixes
  

QSAS version 3.2.6

• New Vector Plugins
  
• Div(tensor)
• Grad(vector)
• Sum down option added in PSD slice
• Plot, added toggle to use 'Object Info' as plot Legend text
  
• "Time Intervals" on Working List now called "Time_Intervals"
  
• helps batch scripts
• has backward compatibility for savesets
  

• Bug fixes, including:
• Problem in slice in 3D plot at phi near 45deg and theta near 90deg
• Find/Replace not updating plot object
• Legend when time axis runs backwards
• Minor fixes in batch processing and calculator
  

QSAS version 3.2.5

• Phase Space Density tool greatly improved
• Much more control over slices (and moved to a single interface)
• Polar and cartesian slices on linear or log scale
• Much faster slices and Pitch Angle Distribution with control over interpolation.
  
• Convert PSD to velocity space
• PSD values along a vector
  
• New capability in 3D plotting.
• Option to view slice normal to any axis or a user specified direction
• Interactive control of slice displacement and orientation allowing user to scan through the data using the sliders
• Ability save the vector to the slice centre from data origin onto the Working List. Thus by centring the slice on a feature its location may be determined and saved as a vector offset.
• Add: 
• Shift-click in plot window saves selected time to Time List

• Bug fixes, including:
• Various bugs in plot page layout
• Fix symbols reversed or upside down when axes run backwards
• Fix Linear regression on log and log-log plots
• Fix various calculator bugs
• Fix missing signals in plot: page size options focusOut()
• Fix plot not updating default colours when object changed
• Fix metadata SI_conversion when multiplying

QSAS version 3.2.4

Internal release for testing only.

QSAS version 3.2.3

• QSAS now draws its own plot symbols instead of using plplot glyphs:

• Greatly improves accuracy of symbol placement
• Improves plot speed when symbols used
• Improves correspondence between screen, plot files and print versions of plots
• Note: Custom symbols and those below 'custom' on the menu still use plplot glyphs
• Fix bug in getting time average from plot
• Fix bug in plot not always updating cache when typing in a field
• Fix bug in calculator when extracting metadata
• Other minor bug fixes
  

QSAS version 3.2.2

• Fix crash in object editor if button pushed twice
• Fix gap handling in boxcar join
• Fix validation on rename or move items on Working List
• Added Find/Replace in data slots
• Added Undo in data slots
• Modified data slot validation to be more consistent
• Fix bug in PSD tools not correctly converting energy threshold from eV if single value provided
• Fix bug in calculator, restore not setting the output object names fully
• Fix crash in editing colour table (Hue range)
• Changes to metadata handling inside file reading modules

QSAS version 3.2.1

• Improved Linux compatibility
• Fix isRegular() to return seconds, not nanoseconds
• Fix timeline option not restoring properly in the calculator
• set error if opThis fails for all op
• Join Automatic option moved
• Separate DV_GAP_BOX_WIDTH and disable GAP value for boxcar
• When plotting multiple pages, window id lists now updated properly.
• Fix write epoch16
• Export/Join GUI feedback now properly updating on drop and item select
• Tetrahedron Plugin axis ratios now isotropic again
• Fixed plot time interval not always refreshed on load plot profile or in batch
• Plot to PDF and print, improve line widths and font sizes compared with screen plots
• Legend line lengths may now be zero (no line)

QSAS version 3.2.0


• Uses rigorous nanosec timeing in DvTime with leap seconds
  
• Improve is_regular and assign_regular to use new DvTime
• Smaller/faster Saveset from using nanosec from start time
• Relative paths for QSASscripts (or env variables)
• Fix Editors to not update time immediately
• Value return window tab and stand-alone now use same widget
• Record slider failed at > 1 million records on Mac (changed QT style)
• Minor plot enhancements (Colour and Legend)




QSAS is a software package which provides a flexible, extendable environment for the selection, manipulation, and display of space physics data. QSAS is written in C/C++ and is compiled using the gnu compiler set, and makes use of several elements of third-party software, including Qt (http://qt-project.org/downloads), cdf (http://cdf.gsfc.nasa.gov/) and PLplot (http://plplot.sourceforge.net/). Currently available for Linux, Mac OSX  and Windows.

Getting QSAS...
 
Download page defaults to version appropriate for your platform. Select Browse All Files for other versions.

 


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A sample session is shipped with the distribution (QSAS32/tmp/SampleSession). This may be open from the QSAS 'File/Restore Session' menu. 
• QSAS Help Pages (html) and other documentation are included in all distributions.
• DvObjectClass.html provides programmer's documentation on the DVOS kernel that can be used within plugins.
  
  

  Plug-in Libraries

  Plug-ins written by the QSAS team and many of the plugins provided by Stein Haaland are distributed with QSAS.

  
  

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  DVOS Library
  

  The DVOS library is also available as a self-contained download: select 'Browse All Files..." to DVOS directory for download.
  

Acknowledging QSAS in Publications

The preferred wording for acknowledging use of QSAS in publications is "Data analysis was done with the QSAS science analysis system provided by the United Kingdom Cluster Science Centre (Imperial College London) supported by The Science and Technology Facilities Council (STFC)" or similar wording as appropriate.