                            Extended   OMNI2  DATA SET

The main purpose of creating the "extended" directory is to allow the extended
("dynamic") OIMN2 dataset be created and managed as necessary. This "extensions"
 allows the number of OMNI parameters to be changed; for example, a new 
parameter(s) needs to be added to 55 original OMNI parameters at the end of each
 data file record (see upper level dir. "../omni/low_res_omni/").

This upgrade allows us to add more parameters to OMNI2 in the future. 
Therefore, a user should read first the format description ( see below)
before applying the OMNI data from the new "extented" directory to his or her 
scientific  application.

As the first step, a new parameter "Solar Lyman Alpha index" has been recently 
added to the end of all OMNI data records  as the 56th  parameter; these new 
OMNI data files are now made available in the "extented" directory.

Thus, the "extented" directory now contains data files with the original 55 OMNI
parameters (from the directory "/data/omni/low_res_omni/") plus one more, 
56th parameter " Solar Lyman Alpha". 
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The new format for this new data set is:
                                             
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                         OMNI2_YYYY.DAT FORMAT DESCRIPTION     
                                                   
         
WORD  FORMAT  Fill Value         MEANING                  UNITS/COMMENTS
                               
 1      I4              Year                              1963, 1964, etc.
 2      I4              Decimal Day                       January 1 = Day 1
 3      I3              Hour                              0, 1,...,23   
 4      I5   9999      Bartels rotation number
 5      I3    99        ID for IMF spacecraft             See table
 6      I3    99        ID for SW plasma spacecraft       See table
 7      I4   999       # of points in the IMF averages 
 8      I4   999       # of points in the plasma averages 
 9     F6.1  999.9     Field Magnitude Average |B|       1/N SUM |B|, nT
10     F6.1  999.9     Magnitude of Average Field Vector sqrt(Bx^2+By^2+Bz^2) 
11     F6.1  999.9     Lat.Angle of Aver. Field Vector   Degrees (GSE coords) 
12     F6.1  999.9     Long.Angle of Aver.Field Vector   Degrees (GSE coords) 
13     F6.1  999.9     Bx GSE, GSM                       nT 
14     F6.1  999.9     By GSE                            nT 
15     F6.1  999.9     Bz GSE                            nT
16     F6.1  999.9     By GSM                            nT
17     F6 1  999.9     Bz GSM                            nT
18     F6.1  999.9     sigma|B|            RMS Standard Deviation in average
                                               magnitude (word 10), nT
19     F6.1  999.9     sigma B             RMS Standard Deviation in field
                                            vector, nT (**)
20     F6.1  999.9     sigma Bx            RMS Standard Deviation in GSE 
                                            X-component average, nT 
21     F6.1  999.9     sigma By            RMS Standard Deviation in GSE
                                            Y-component average, nT 
22     F6.1  999.9     sigma Bz            RMS Standard Deviation in GSE 
                                             Z-component average, nT 

23     F9.0  9999999.  Proton temperature                Degrees, K
24     F6.1  999.9     Proton Density                    N/cm^3 

25     F6.0  9999.     Plasma (Flow) speed               km/s
26     F6.1  999.9     Plasma Flow Long. Angle    Degrees, quasi-GSE*
27     F6.1  999.9     Plasma  Flow Lat. Angle     Degrees, GSE* 

28     F6.3  9.999     Na/Np                    Alpha/Proton ratio 
29     F6.2  99.99     Flow Pressure            P (nPa) = (1.67/10**6) * Np*V**2 * (1+ 4*Na/Np)
                                                for hours with non-fill Na/Np ratios and
                                                P (nPa) = (2.0/10**6) * Np*V**2
                                                for hours with fill values for Na/Np

30     F9.0  9999999.  sigma T                           Degrees, K
31     F6.1  999.9     sigma N                           N/cm^3
32     F6.0  9999.     sigma V                           km/s
33     F6.1  999.9     sigma phi V                       Degrees
34     F6.1  999.9     sigma theta V                     Degrees
35     F6.3  9.999     sigma-Na/Np   

36     F7.2  999.99    Electric field         -[V(km/s) * Bz (nT; GSM)] * 10**-3. (mV/m)
37     F7.2  999.99    Plasma beta            Beta = [(T*4.16/10**5) + 5.34] * Np / B**2
38     F6.1  999.9     Alfven mach number      Ma = (V * Np**0.5) / 20 * B



39     I3    99        Kp               Planetary Geomagnetic Activity Index
                                       (e.g. 3+ = 33, 6- = 57, 4 = 40, etc.)

40      I4   999        R                          Sunspot number (new version 2)
41      I6   99999     DST Index                         nT
42      I5   9999      AE-index                    nT, from from Kyoto 
43     F10.2 999999.99 Proton flux                 number/cmsq sec sr >1 Mev 
44     F9.2  99999.99  Proton flux                 number/cmsq sec sr >2 Mev
45     F9.2  99999.99  Proton flux                 number/cmsq sec sr >4 Mev
46     F9.2  99999.99  Proton flux                 number/cmsq sec sr >10 Mev
47     F9.2  99999.99  Proton flux                 number/cmsq sec sr >30 Mev
48     F9.2  99999.99  Proton flux                 number/cmsq sec sr >60 Mev
49      I3   0         Flag(***)                       (-1,0,1,2,3,4,5,6)     
 
50      I4                                       ap-index, nT
51       F6.1                                    f10.7_index  sfu = 10-22W m-2 Hz-1
52       F6.1                                    PC(N) index
53       I6                                      AL-index, nT, from Kyoto                     
54       I6                                      AU-index, nT, from Kyoto
55       F5.1    99.9   Magnetosonic mach number= = V/Magnetosonic_speed
                       Magnetosonic speed = [(sound speed)**2 + (Alfv speed)**2]**0.5
                       The Alfven speed = 20. * B / N**0.5 
                       The sound speed = 0.12 * [T + 1.28*10**5]**0.5 
                       About Magnetosonic speed check  http://ftpbrowser.gsfc.nasa.gov/bow_derivation1.html also

56      F9.6   0.999999    Solar Lyman Alpha Irradiance   Unit: W/m^2  

57      F7.4   9.9999    Proton QI == solar wind (magnetic energy density)/(kinetic energy density)
                          QI= (B^2/8Pi)/(Den*V2/2)
                          QI=1/Ma^2, Ma is Proton Mach Number
                         For details see: https://omniweb.sci.gsfc.nasa.gov/ftpbrowser/bow_derivation.html

                     
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FORMAT(2I4,I3,I5,2I3,2I4,14F6.1,F9.0,F6.1,F6.0,2F6.1,F6.3,F6.2,
F9.0,F6.1,F6.0,2F6.1,F6.3,2F7.2,F6.1,I3,I4,I6,I5,F10.2,5F9.2,I3,I4,2F6.1,2I6,F5.1,F9.6, F7.3)

                         TABLE: SPACECRAFT IDENTIFIERS 
                    
       Spacecraft Name                                    Spacecraft ID
                            
       IMP 1 (Explorer 18)                                      18
       IMP 3 (Explorer 28)                                      28    
       IMP 4 (Explorer 34)                                      34
       IMP 5 (Explorer 41)                                      41    
       IMP 6 (Explorer 43)                                      43
    
       IMP 7 (Explorer 47)                                      47 MAG and Plasma/MIT
       IMP 7 (Explorer 47)                                      44 Plasma/LANL

       IMP 8 (Explorer 50)                                     50 MAG and Plasma/MIT
       IMP 8 (Explorer 50)                                     45 Plasma/LANL
      
       AIMP 1 (Explorer 33)                                     33    
       AIMP 2 (Explorer 35)                                     35   
       HEOS 1 and HEOS 2                                         1
       VELA 3                                                    3
       OGO 5                                                     5
       Merged LANL VELA Speed Data (July 1964 - March 1971)     97
       Merged LANL IMP T,N,V (Including all IMP 8 LANL Plasma)  98
       ISEE 1                                                   11
       ISEE 2                                                   12
       ISEE 3                                                   13
       PROGNOZ 10                                               10
       WIND                                                     51 -mag, plasma_KP; 52-Plasma_definitive
       ACE                                                      71 
       Geotail                                                  60
       No spacecraft                                            99
                  
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  Acknowledgement:

 Use of these data in publications should be accompanied at minimum by
 acknowledgements of the GSFC/SPDF and OMNIWeb.   
             
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SPDF contact:
 Dr. N. Papitashvili  E-mail: natalia.e.papitashvili@nasa.gov
    
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