<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-01 -032 21:20:00.000"
URSICode="SAA0K"
StationName="SaoLuis"
GeoLatitude="-2.6"
GeoLongitude="315.8"
Source="Ionosonde"
SourceType="DPS-4"
ScalerType="auto">
<SystemInfo UMLStationID="903">
<FrequencyStepping StartFrequency="1.0" StopFrequency="18.0">
<LinearStepping Step="0.05" Units="MHz" />
</FrequencyStepping>
<RangeStepping StartRange="80.0" StopRange="1360.0" >
<LinearStepping Step="5.0" Units="km" />
</RangeStepping>
<AutoScaler Name="Artist5" Version="500200" ArtistFlags="2 2 0 0 0 0 0 0 0 11 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 90% PACIFIC flags: One of F2 cusps was derived from the other</Comments>
<ContactPerson>
<Name>Dr. Mangalathayil Ali Abdu</Name>
<Affiliation>INPE, Division of Aeronomy</Affiliation>
<Address>Av dos Astronautas, 1.758 Jd. Granja - CEP: 12227-010 Sao Jose dos Campos - SP Brasil</Address>
<Email>maabdu@dae.inpe.br</Email>
</ContactPerson>
<StartTime Format="yyyy.MM.dd (DDD) HH:mm:ss" TimeZone="Coordinated Universal Time" >
2026.02.01 (032) 21:20:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.13" Model="IGRF 3.0" Altitude="300"/>
<DeclinationAngle Val="-19.74" Model="IGRF 3.0" Altitude="300"/>
<SunSpotNumber Val="-1.0" Status="predicted"/>
</SolarTerrestrialData>
<DigisondePreface Format="FF">
FF202603202012120009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="9.300" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.265" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="21.068" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.150" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.150" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="9.600" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="295.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="295.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="110.000" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="20.000" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.250" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="8.550" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="575.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Custom Name="dlt foF2" Val="0.000" Description="Adjustment to the scaled foF2 during profile inversion" Units="MHz" />
<Modeled Name="foEp" Val="1.018" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.150" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.150" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="447.622" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="334.000" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.138" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="162.269" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="37.682" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="81.982" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="165.200" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.870" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="144">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.15 2.2 2.25 2.3 2.35 2.4 2.45 2.5 2.55 2.6 2.65 2.7 2.75 2.8 2.85 2.9 2.95 3.0 3.05 3.1 3.15 3.2 3.25 3.3 3.35 3.4 3.45 3.5 3.55 3.6 3.65 3.7 3.75 3.8 3.85 3.9 3.95 4.0 4.05 4.1 4.15 4.2 4.25 4.3 4.35 4.4 4.45 4.5 4.55 4.6 4.65 4.7 4.75 4.8 4.85 4.9 4.95 5.0 5.05 5.1 5.15 5.2 5.25 5.3 5.35 5.4 5.45 5.5 5.55 5.6 5.65 5.7 5.75 5.8 5.85 5.9 5.95 6.0 6.05 6.1 6.15 6.2 6.25 6.3 6.35 6.4 6.45 6.5 6.55 6.6 6.65 6.7 6.75 6.8 6.85 6.9 6.95 7.0 7.05 7.1 7.15 7.2 7.25 7.3 7.35 7.4 7.45 7.5 7.55 7.6 7.65 7.7 7.75 7.8 7.85 7.9 7.95 8.0 8.05 8.1 8.15 8.2 8.25 8.3 8.35 8.4 8.45 8.5 8.55 8.6 8.65 8.7 8.75 8.8 8.85 8.9 8.95 9.0 9.05 9.1 9.15 9.2 9.25 9.3
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
295.000 295.000 297.500 300.000 300.000 300.000 300.000 300.000 300.000 300.000 300.000 300.000 300.000 300.000 300.000 300.000 305.000 305.000 305.000 305.000 305.000 305.000 305.000 305.000 308.000 311.000 314.000 317.000 320.000 320.000 321.250 322.500 323.750 325.000 325.909 326.818 327.727 328.636 329.545 330.455 331.364 332.273 333.182 334.091 335.000 337.500 340.000 340.000 340.000 342.262 344.524 346.786 349.048 351.310 353.571 355.833 358.095 360.357 362.619 364.881 367.143 369.405 371.667 373.929 376.190 378.452 380.714 382.976 385.238 387.500 389.762 392.024 394.286 396.548 398.810 401.071 403.333 405.595 407.857 410.119 412.381 414.643 416.905 419.167 421.429 423.690 425.952 428.214 430.476 432.738 435.000 437.500 440.000 442.500 445.000 445.000 450.000 453.333 456.667 460.000 465.000 470.000 472.500 475.000 477.500 480.000 482.500 485.000 490.000 500.000 500.000 505.000 510.000 515.000 515.000 520.000 520.000 520.000 530.000 530.000 535.000 540.000 545.000 550.000 560.000 565.000 565.000 570.000 575.000 590.000 595.000 599.235 603.872 608.970 614.603 620.858 627.847 635.704 644.603 654.766 666.482 680.138 696.258 715.575
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 60 0 57 54 0 0 0 0 0 63 0 54 0 63 60 66 0 66 69 63 57 63 54 0 0 0 0 0 63 0 0 0 60 0 0 51 0 0 0 0 0 0 0 0 0 0 69 63 0 0 0 0 0 48 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 51 0 60 0 66 66 69 0 0 51 60 57 0 0 0 0 0 66 69 63 66 0 57 51 63 66 69 60 72 57 72 66 72 69 60 63 75 66 66 48 60 63 66 63 63 72 66 60 63 66 0 45 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 2.734375 -0.390625 -1.171875 -0.390625 -0.390625 -0.390625 -1.171875 -0.390625 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 2.734375 -1.171875 -1.171875 -1.171875 0.390625 -1.171875 2.734375 -1.171875 1.171875 1.953125 -1.171875 -1.171875 -0.390625 -1.171875 -2.734375 0.390625 -0.390625 -0.390625 1.171875 1.171875 -0.390625 -0.390625 1.953125 -2.734375 -1.171875 2.734375 2.734375 -1.953125 1.953125 2.734375 -1.953125 -1.953125 1.953125 2.734375 -1.171875 1.953125 -1.171875 0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.953125 -1.953125 -1.171875 -1.171875 -1.171875 -0.390625 -1.953125 -1.171875 1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.171875 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -2.734375 -1.953125 -1.953125 1.171875 -2.734375 -0.390625 1.171875
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="187">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
90.253 95.0 100.0 105.0 110.0 115.0 120.0 125.0 126.58 130.0 135.0 140.0 143.161 145.0 150.0 155.0 159.741 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 447.622 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.678 0.882 0.985 1.018 1.001 0.948 0.853 0.813 0.813 0.813 0.813 0.813 0.836 0.898 0.959 1.018 1.023 1.111 1.193 1.273 1.355 1.44 1.529 1.625 1.728 1.84 1.963 2.099 2.248 2.412 2.592 2.785 2.99 3.202 3.419 3.636 3.851 4.063 4.27 4.473 4.671 4.864 5.053 5.238 5.419 5.597 5.772 5.944 6.114 6.281 6.446 6.609 6.77 6.929 7.086 7.242 7.396 7.548 7.698 7.847 7.993 8.136 8.276 8.413 8.545 8.671 8.792 8.904 9.006 9.097 9.173 9.234 9.275 9.297 9.3 9.299 9.293 9.28 9.261 9.236 9.206 9.17 9.13 9.084 9.034 8.98 8.921 8.859 8.794 8.725 8.653 8.578 8.5 8.42 8.338 8.254 8.168 8.08 7.991 7.9 7.808 7.715 7.621 7.526 7.431 7.335 7.239 7.143 7.046 6.949 6.852 6.755 6.659 6.562 6.466 6.371 6.275 6.181 6.087 5.993 5.9 5.808 5.716 5.626 5.536 5.447 5.358 5.271 5.185 5.099 5.015 4.931 4.849 4.767 4.686 4.607 4.528 4.451 4.374 4.299 4.224 4.151 4.079 4.008 3.937 3.868 3.8 3.733 3.667 3.601 3.537 3.474 3.412 3.351 3.291 3.232 3.173 3.116 3.06 3.004 2.95 2.896 2.843 2.792 2.741 2.691 2.641 2.593 2.545 2.499 2.453 2.408 2.363 2.32 2.277 2.235 2.194 2.153 2.113 2.074 2.036 1.998 1.961 1.924 1.889 1.853

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="1.018" PeakHeight="110.0" Num="3" Error="0.0">
-26.583 8.082 -1.246
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="1.018" EndFrequency="9.3" PeakHeight="447.622" Num="5" zHalfNm="334.0" Error="8.744">
-278.872 -17.599 18.461 -16.508 6.637
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="49.741" Depth="0.205"/>
<TopsideChapman PeakHeight="447.622" PeakDensity="1073076.9" PeakScaleHeight="81.982" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
