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 https://omniweb.gsfc.nasa.gov/ftpbrowser/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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Related data and directories:
SPDF Data and Orbits Services <http://spdf.gsfc.nasa.gov/>
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Acknowledgement:
Use of these data in publications should be accompanied by
acknowledgements of the
Space Physics Data Facility(SPDF) and
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SPDF Contact: Natalia Papitashvili <Natalia.E.Papitashvili@nasa.gov>
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Authorizing NASA Official: R.M. Candey, Head, SPDF, NASA Goddard Space Flight Center
e-mail: Robert.m.candey@nasa.gov
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