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d199c5f0   Elena.Budnik   mex,vex help 
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<h2>IMA Ion Moments</h2>
IMA ion moments are calculated in IRAP using Andrei Fedorov procedure.
<br/><b>Caveats</b>
<ul>
<li> Measurements before May 2007 starts from Energy = 300 eV. 
<li>IMA/MEX operates in two modes -16 / 2 elevation angles (averaged). In <i>2 elevations</i> mode the quailty flag value is undefined (== 0). 
 Density quality flag values : 
	<ul>
        <li> 0.0       : Undefined (2 elevation angles mode)
        <li> 0.0 - 0.6 : Poor
        <li> 0.6 - 0.8 : Acceptable
        <li> 0.8 - 0.9 : Good   
        <li> 0.9 - 1.0 : Excellent          
	</ul>
MEX IMA  protons and heavy ions number density could be considered reliable only in the case when corresponding quality flag 
(<b><i>moments_quality_factor</i></b>) is greater than 0.6 and density values themselves are greater than 0.01 cm-3<br/>
It is highly recommended to download quality flag along with IMA ion densities.	
<li>Due to instrument limitations IMA/MEX measures protons with the energies higher than 1 keV. If possible  
the proton parameters are reconsructed from the <a target='new' href="help/auto/img/mex_ima.png">ghost' distrubution function.</a>  
</ul>
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