<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-27 -058 21:30:00.000"
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 22 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 85% PACIFIC flags: Multiple candidates for F2x cusp, 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" >
2026.02.27 (058) 21:30:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.15" 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">
FF202605802272130009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="9.300" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.505" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="23.300" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.550" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.550" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="9.700" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="310.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="310.000" 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="0.400" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="8.600" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="495.000" 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="0.760" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.550" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.550" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="403.737" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="322.416" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.089" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="117.582" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="27.507" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="60.065" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="118.970" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.910" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="116">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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" >
310.000 310.000 310.000 310.000 312.500 315.000 315.000 315.000 315.714 316.429 317.143 317.857 318.571 319.286 320.000 320.000 325.000 326.667 328.333 330.000 330.000 332.500 335.000 340.000 340.000 340.000 340.000 340.000 342.500 345.000 345.000 345.000 345.000 345.000 347.500 350.000 350.000 350.000 355.000 350.000 351.667 353.333 355.000 356.667 358.333 360.000 365.000 370.000 370.000 370.000 370.000 370.000 375.000 380.000 380.000 380.000 380.000 385.000 385.000 385.000 390.000 390.000 390.000 390.000 395.000 400.000 400.000 405.000 407.500 410.000 410.000 410.000 415.000 415.000 420.000 420.000 425.000 425.000 430.000 430.000 430.000 435.000 440.000 445.000 445.000 445.000 450.000 455.000 455.000 455.000 460.000 465.000 465.000 470.000 475.000 475.000 480.000 480.000 485.000 490.000 495.000 495.000 505.000 510.000 515.000 515.000 520.000 525.000 530.000 536.479 543.936 552.610 562.828 575.040 589.894 608.350
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 0 54 51 0 57 51 57 0 0 0 0 0 0 54 54 66 0 0 57 0 0 48 48 0 0 0 63 0 48 54 60 0 54 54 57 0 54 57 0 0 0 0 57 0 63 60 54 54 0 0 54 60 54 0 0 57 51 60 60 54 60 60 72 63 72 72 63 45 57 60 69 63 60 54 60 57 66 57 66 57 60 60 48 48 54 54 51 60 51 57 60 57 57 57 63 60 57 60 66 66 63 66 57 54 57 57 60 57 51 48 0 0 0 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-1.171875 -1.171875 -1.171875 1.953125 -1.171875 -1.171875 -2.734375 -1.171875 -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 -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 2.734375 -0.390625 -1.171875 -2.734375 -1.953125 -1.171875 -1.171875 -1.171875 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.953125 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -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 -1.171875 -1.171875 -1.953125 -1.953125 -1.953125 -1.171875 -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 -2.734375 -0.390625 1.171875 -1.953125 0.390625
</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" >
90.63 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 133.819 135.0 140.0 145.0 150.0 155.0 157.639 160.0 165.0 170.0 175.0 180.0 181.458 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 403.737 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.505 0.659 0.736 0.76 0.748 0.712 0.648 0.546 0.424 0.424 0.424 0.424 0.424 0.424 0.424 0.457 0.528 0.598 0.669 0.739 0.76 0.846 0.953 1.057 1.165 1.279 1.402 1.535 1.68 1.84 2.014 2.204 2.409 2.629 2.862 3.105 3.356 3.612 3.873 4.135 4.398 4.661 4.923 5.183 5.442 5.699 5.954 6.207 6.456 6.703 6.946 7.185 7.419 7.648 7.87 8.084 8.288 8.481 8.659 8.822 8.966 9.087 9.184 9.252 9.291 9.3 9.3 9.29 9.269 9.237 9.195 9.143 9.081 9.012 8.934 8.849 8.758 8.661 8.559 8.452 8.34 8.225 8.106 7.984 7.86 7.733 7.605 7.476 7.345 7.214 7.082 6.95 6.818 6.686 6.554 6.423 6.293 6.164 6.035 5.908 5.783 5.658 5.535 5.414 5.294 5.176 5.06 4.945 4.833 4.722 4.613 4.506 4.401 4.297 4.196 4.097 3.999 3.904 3.81 3.719 3.629 3.541 3.455 3.371 3.289 3.208 3.13 3.053 2.977 2.904 2.832 2.762 2.693 2.626 2.56 2.497 2.434 2.373 2.314 2.256 2.199 2.144 2.09 2.037 1.985 1.935 1.886 1.839 1.792 1.747 1.702 1.659 1.617 1.576 1.536 1.497 1.459 1.422 1.386 1.35 1.316 1.282 1.25 1.218 1.187 1.156 1.127 1.098 1.07 1.043 1.016 0.99 0.965 0.94 0.916 0.893 0.87 0.847 0.826 0.805 0.784 0.764 0.744 0.725 0.707 0.689

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="0.76" PeakHeight="110.0" Num="3" Error="0.0">
-25.13 6.621 -0.861
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="0.76" EndFrequency="9.3" PeakHeight="403.737" Num="5" zHalfNm="322.416" Error="4.174">
-218.556 -9.09 8.151 -5.914 3.13
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="71.458" Depth="0.336"/>
<TopsideChapman PeakHeight="403.737" PeakDensity="1073076.9" PeakScaleHeight="60.065" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
