<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-26 -057 19:50:00.000"
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" >
2026.02.26 (057) 19:50:00</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">
FF202605702261950009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="10.350" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.342" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="24.240" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.200" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.200" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.700" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="220.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="220.000" 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="0.100" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="9.450" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="540.000" 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="2.402" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.200" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.200" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="401.814" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="269.941" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.509" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="177.397" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="52.856" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="92.454" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="198.970" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.570" 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" >
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 9.35 9.4 9.45 9.5 9.55 9.6 9.65 9.7 9.75 9.8 9.85 9.9 9.95 10.0 10.05 10.1 10.15 10.2 10.25 10.3 10.35
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
220.000 225.000 228.750 232.500 236.250 240.000 235.000 237.500 240.000 240.000 241.000 242.000 243.000 244.000 245.000 250.000 251.429 252.857 254.286 255.714 257.143 258.571 260.000 260.000 265.000 270.000 270.000 272.500 275.000 275.000 275.000 277.500 280.000 282.500 285.000 280.000 285.000 285.000 290.000 292.143 294.286 296.429 298.571 300.714 302.857 305.000 305.000 305.000 305.000 305.000 310.000 315.000 315.000 315.000 315.000 320.000 322.500 325.000 325.000 330.000 332.500 335.000 335.000 340.000 345.000 345.000 345.000 350.000 350.000 355.000 355.000 360.000 360.000 365.000 365.000 370.000 370.000 375.000 375.000 380.000 385.000 385.000 385.000 390.000 395.000 400.000 400.000 405.000 405.000 410.000 415.000 415.000 420.000 420.000 425.000 430.000 430.000 440.000 440.000 445.000 450.000 450.000 460.000 465.000 465.000 470.000 470.000 480.000 480.000 485.000 490.000 490.000 495.000 500.000 500.000 505.000 510.000 515.000 520.000 520.000 525.000 530.000 530.000 535.000 537.500 540.000 545.000 550.000 555.000 560.000 565.000 572.500 580.000 585.000 595.000 600.000 608.571 617.950 628.257 639.637 652.266 666.363 682.199 700.117
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 51 0 0 0 45 57 0 57 60 0 0 57 0 48 51 0 0 0 0 0 0 60 57 0 51 57 0 51 54 60 51 57 0 51 57 60 60 57 0 54 0 0 0 0 51 60 63 63 0 66 60 0 66 63 66 0 66 66 63 0 63 66 63 51 60 66 60 66 60 66 63 69 63 69 63 69 63 69 66 60 69 66 69 63 57 69 66 69 69 66 72 72 69 69 72 69 69 69 72 72 69 69 63 69 69 66 63 66 69 66 69 69 66 69 69 63 57 51 63 60 51 63 60 54 63 63 63 60 63 57 0 57 57 57 54 54 51 0 51 48 45 45 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 -0.390625 -0.390625 -1.171875 -1.171875 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -2.734375 -0.390625 -0.390625 -2.734375 2.734375 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 1.953125 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 0.390625 -0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -1.171875 0.390625 0.390625 0.390625 0.390625 1.171875
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="188">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
89.661 90.0 95.0 100.0 105.0 110.0 115.0 116.075 120.0 122.149 125.0 128.224 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 401.814 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.229 1.612 2.08 2.324 2.402 2.317 2.276 2.276 2.276 2.335 2.402 2.453 2.589 2.719 2.85 2.984 3.123 3.269 3.423 3.587 3.762 3.948 4.143 4.348 4.558 4.771 4.984 5.195 5.401 5.602 5.798 5.987 6.171 6.348 6.521 6.689 6.853 7.012 7.168 7.32 7.47 7.616 7.761 7.903 8.043 8.181 8.317 8.451 8.585 8.716 8.847 8.976 9.104 9.23 9.354 9.477 9.598 9.715 9.829 9.938 10.041 10.134 10.215 10.281 10.326 10.348 10.35 10.349 10.342 10.33 10.313 10.29 10.262 10.23 10.193 10.151 10.106 10.056 10.003 9.947 9.887 9.823 9.757 9.688 9.616 9.542 9.465 9.387 9.306 9.224 9.14 9.054 8.967 8.878 8.789 8.698 8.606 8.514 8.421 8.327 8.233 8.138 8.043 7.948 7.852 7.757 7.661 7.566 7.47 7.375 7.28 7.185 7.091 6.997 6.903 6.81 6.717 6.625 6.534 6.443 6.353 6.263 6.175 6.087 5.999 5.913 5.827 5.742 5.658 5.575 5.492 5.411 5.33 5.25 5.171 5.093 5.016 4.94 4.864 4.79 4.716 4.644 4.572 4.501 4.431 4.362 4.294 4.227 4.16 4.095 4.031 3.967 3.904 3.842 3.781 3.721 3.662 3.603 3.546 3.489 3.433 3.378 3.323 3.27 3.217 3.165 3.114 3.063 3.014 2.965 2.917 2.869 2.822 2.776 2.731 2.687 2.643 2.599 2.557 2.515 2.474 2.433 2.393 2.354 2.315 2.277 2.24

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.402" PeakHeight="110.0" Num="3" Error="0.0">
-29.603 11.854 -2.59
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.402" EndFrequency="10.35" PeakHeight="401.814" Num="5" zHalfNm="269.941" Error="6.353">
-255.602 -34.151 28.076 -17.327 5.414
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="18.224" Depth="0.126"/>
<TopsideChapman PeakHeight="401.814" PeakDensity="1329063.2" PeakScaleHeight="92.454" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
