<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-22 -053 21:00:00.000"
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: 70% PACIFIC flags: F2 cusps do not match</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" >
2026.02.22 (053) 21:00:00</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">
FF202605302222100009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="29" >
<URSI ID="00" Val="11.550" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.424" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="27.996" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.400" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="3.650" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.700" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="11.100" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="275.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="275.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="115.000" Name="h`Es" 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="0.200" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="10.850" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="535.000" 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="1.418" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.700" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.700" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="421.040" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="328.060" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.237" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="2.400" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="132.909" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="48.357" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="66.635" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="147.760" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.480" Name="B1" QL="/" DL="/" />
<URSI ID="32" Val="2.700" Name="fbEs" Units="MHz" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="178">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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 10.4 10.45 10.5 10.55 10.6 10.65 10.7 10.75 10.8 10.85 10.9 10.95 11.0 11.05 11.1 11.15 11.2 11.25 11.3 11.35 11.4 11.45 11.5 11.55
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
275.000 280.000 280.000 280.000 280.000 280.000 280.000 281.000 282.000 283.000 284.000 285.000 286.000 287.000 288.000 289.000 290.000 290.000 291.000 292.000 293.000 294.000 295.000 295.000 295.000 295.000 295.000 295.000 300.000 300.000 300.000 300.000 301.667 303.333 305.000 306.667 308.333 310.000 311.667 313.333 315.000 315.000 315.000 316.667 318.333 320.000 321.667 323.333 325.000 326.667 328.333 330.000 330.000 330.000 335.000 335.000 335.000 335.000 335.000 335.000 345.000 340.000 345.000 345.000 346.667 348.333 350.000 355.000 355.000 355.000 357.500 360.000 360.000 365.000 367.500 370.000 372.500 375.000 375.000 375.000 377.500 380.000 385.000 385.000 387.500 390.000 395.000 395.000 395.000 400.000 400.000 405.000 405.000 407.500 410.000 410.000 415.000 420.000 420.000 425.000 425.000 425.000 430.000 435.000 435.000 435.000 440.000 442.500 445.000 445.000 445.000 445.000 448.333 451.667 455.000 455.000 455.000 455.000 460.000 460.000 460.000 460.000 460.000 465.000 465.000 465.000 470.000 470.000 470.000 475.000 480.000 480.000 480.000 480.000 480.000 480.000 480.000 485.000 487.000 489.000 491.000 493.000 495.000 496.667 498.333 500.000 505.000 505.000 505.000 507.500 510.000 511.667 513.333 515.000 520.000 520.000 520.000 525.000 526.250 527.500 528.750 530.000 535.000 535.000 545.000 550.000 555.000 560.000 565.000 570.000 575.000 580.000 587.362 595.426 604.297 614.102 624.998 637.177
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
63 63 69 66 66 63 66 0 63 0 0 0 66 0 0 0 0 63 0 0 0 0 69 69 0 66 63 60 66 0 69 66 0 0 0 0 0 0 57 0 57 0 0 0 57 0 0 0 0 0 0 51 63 60 57 63 0 0 0 0 57 63 63 66 0 0 66 60 60 60 0 54 63 66 0 0 0 57 63 66 0 66 60 66 60 66 57 66 69 63 66 66 69 0 69 66 72 63 72 57 66 72 66 54 63 69 60 0 51 57 0 66 0 0 51 60 66 69 63 69 69 66 63 72 69 66 69 0 66 0 54 0 66 66 0 63 63 60 0 0 60 0 63 0 0 60 51 0 60 51 57 0 0 57 48 54 54 51 0 48 0 0 45 45 45 45 0 0 0 0 45 45 42 0 45 0 45 42
</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 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -0.390625 1.171875 -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 -1.953125 -0.390625 -1.171875 -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 -1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -0.390625 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -0.390625 -0.390625 -0.390625 -1.171875 -0.390625 -1.171875 -0.390625 -0.390625 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -0.390625 -0.390625 2.734375 -0.390625 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.953125 -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 -1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -0.390625 -1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -0.390625 -0.390625 -1.171875 -0.390625 -0.390625 -0.390625 -2.734375 -0.390625 -0.390625 0.390625 0.390625 -1.171875 2.734375 0.390625 -0.390625 -1.171875 -1.171875 -0.390625 -1.171875 -0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="26">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
115.000 115.000 115.000 115.000 115.556 116.111 116.667 117.222 117.778 118.333 118.889 119.444 120.000 115.000 120.000 125.000 121.667 118.333 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
63 66 69 66 0 0 0 0 0 0 0 0 60 66 0 66 0 0 60 0 0 0 0 0 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 0.390625 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 0.390625 -0.390625 0.390625 -0.390625 -0.390625 2.734375 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625
</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" >
89.974 90.0 95.0 100.0 105.0 110.0 115.0 120.0 121.883 125.0 130.0 133.766 135.0 140.0 145.0 145.649 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 421.04 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.202 0.947 1.228 1.373 1.418 1.392 1.312 1.267 1.267 1.267 1.267 1.283 1.346 1.41 1.418 1.498 1.593 1.69 1.792 1.9 2.014 2.137 2.268 2.409 2.561 2.724 2.898 3.083 3.279 3.483 3.695 3.913 4.134 4.358 4.583 4.808 5.033 5.256 5.478 5.698 5.916 6.134 6.349 6.563 6.777 6.989 7.2 7.41 7.62 7.83 8.039 8.248 8.458 8.667 8.877 9.087 9.297 9.507 9.718 9.928 10.138 10.346 10.551 10.752 10.944 11.124 11.285 11.417 11.508 11.549 11.55 11.546 11.53 11.503 11.464 11.415 11.357 11.289 11.212 11.128 11.036 10.938 10.833 10.722 10.606 10.485 10.36 10.231 10.099 9.963 9.825 9.685 9.542 9.398 9.253 9.107 8.96 8.812 8.664 8.516 8.368 8.221 8.074 7.927 7.782 7.637 7.494 7.352 7.211 7.071 6.933 6.796 6.661 6.528 6.396 6.266 6.138 6.012 5.888 5.765 5.645 5.526 5.41 5.295 5.182 5.071 4.963 4.856 4.751 4.648 4.547 4.447 4.35 4.255 4.161 4.069 3.979 3.891 3.805 3.72 3.637 3.556 3.476 3.399 3.322 3.248 3.175 3.103 3.033 2.964 2.897 2.832 2.768 2.705 2.643 2.583 2.524 2.467 2.411 2.356 2.302 2.249 2.198 2.148 2.099 2.05 2.004 1.958 1.913 1.869 1.826 1.784 1.743 1.703 1.664 1.625 1.588 1.551 1.516 1.481 1.447 1.413 1.381 1.349 1.318 1.287 1.258

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="1.418" PeakHeight="110.0" Num="3" Error="0.0">
-27.924 9.637 -1.739
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="1.418" EndFrequency="11.55" PeakHeight="421.04" Num="5" zHalfNm="328.06" Error="5.02">
-242.165 -49.662 27.971 -15.792 4.257
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="35.649" Depth="0.151"/>
<TopsideChapman PeakHeight="421.04" PeakDensity="1655117.9" PeakScaleHeight="66.635" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
