<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-21 -052 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 22 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 80% PACIFIC flags: Multiple candidates for F2x cusp, Multiple candidates for F2o 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" >
2026.02.21 (052) 21:20:00</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">
FF202605202212120009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="29" >
<URSI ID="00" Val="10.150" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.632" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="26.719" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.800" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="3.650" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.250" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.750" 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="34" Val="103.000" 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="0.300" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="9.800" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="490.000" 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="0.986" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.250" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.250" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="377.624" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="310.500" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.140" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="2.800" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="97.453" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="27.480" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="49.080" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="107.870" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.440" Name="B1" QL="/" DL="/" />
<URSI ID="32" Val="3.250" Name="fbEs" Units="MHz" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="139">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
295.000 295.000 295.000 295.000 295.000 297.500 300.000 302.500 305.000 305.000 305.000 310.000 310.000 310.000 310.000 310.000 310.000 312.000 314.000 316.000 318.000 320.000 320.000 320.000 320.000 320.000 320.000 315.000 315.833 316.667 317.500 318.333 319.167 320.000 322.500 325.000 327.500 330.000 331.250 332.500 333.750 335.000 330.000 333.333 336.667 340.000 340.000 340.000 342.500 345.000 345.000 345.000 346.667 348.333 350.000 350.000 352.500 355.000 355.000 355.000 355.000 355.000 356.250 357.500 358.750 360.000 360.000 365.000 365.000 365.000 368.333 371.667 375.000 375.000 375.000 380.000 380.000 380.000 381.667 383.333 385.000 385.000 386.250 387.500 388.750 390.000 395.000 395.000 400.000 400.000 405.000 405.000 405.000 405.000 410.000 410.000 415.000 415.000 415.000 420.000 420.000 420.000 425.000 425.000 425.000 427.500 430.000 435.000 435.000 440.000 440.000 440.000 445.000 445.000 445.000 450.000 455.000 455.000 455.000 460.000 460.000 465.000 470.000 470.000 475.000 475.000 480.000 481.667 483.333 485.000 490.000 490.000 495.000 500.000 505.895 512.435 519.734 527.931 537.204
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
60 63 60 63 57 0 63 0 57 60 63 48 0 0 0 0 0 0 0 0 0 0 51 0 0 0 60 63 0 0 54 0 0 60 0 0 0 0 0 0 0 54 0 0 0 60 0 66 0 54 54 66 0 0 66 69 51 57 63 0 69 69 0 0 0 69 66 66 48 63 0 0 60 66 66 57 63 69 54 0 66 69 0 0 0 69 69 69 60 69 54 60 0 75 69 75 63 69 72 60 69 72 66 69 69 60 72 66 69 57 63 69 69 69 66 69 63 63 63 66 63 66 57 63 63 66 63 0 0 69 69 72 72 60 0 0 0 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-1.171875 -0.390625 -1.171875 -0.390625 -1.171875 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 -1.171875 -0.390625 -1.171875 -1.171875 -0.390625 -0.390625 -0.390625 -1.171875 -0.390625 -0.390625 -1.171875 -1.171875 -1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -1.171875 -0.390625 -1.171875 -0.390625 -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 -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 -2.734375 -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 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 2.734375 -1.953125 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -2.734375 0.390625 -1.171875 1.953125
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="18">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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" >
105.000 105.000 100.000 95.000 95.000 95.000 98.333 101.667 105.000 105.000 115.000 110.000 112.500 115.000 120.000 125.000 130.000 135.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
63 63 69 0 0 51 0 0 57 0 54 51 51 51 0 0 51 48
</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 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" >
90.286 95.0 100.0 105.0 110.0 115.0 120.0 125.0 127.261 130.0 135.0 140.0 144.523 145.0 150.0 155.0 160.0 161.784 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 377.624 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.656 0.854 0.955 0.986 0.969 0.918 0.827 0.769 0.769 0.769 0.769 0.769 0.775 0.838 0.901 0.964 0.986 1.087 1.218 1.341 1.464 1.59 1.722 1.861 2.009 2.166 2.334 2.513 2.702 2.902 3.111 3.331 3.558 3.792 4.032 4.278 4.527 4.78 5.036 5.294 5.555 5.817 6.08 6.346 6.613 6.881 7.15 7.421 7.692 7.964 8.235 8.505 8.773 9.035 9.289 9.528 9.746 9.93 10.066 10.14 10.15 10.148 10.128 10.09 10.035 9.964 9.878 9.779 9.668 9.547 9.415 9.275 9.128 8.974 8.815 8.651 8.484 8.313 8.14 7.965 7.789 7.613 7.437 7.26 7.085 6.911 6.738 6.566 6.397 6.23 6.065 5.903 5.743 5.587 5.433 5.282 5.134 4.989 4.847 4.709 4.573 4.441 4.312 4.186 4.063 3.944 3.827 3.713 3.603 3.495 3.39 3.289 3.189 3.093 2.999 2.908 2.82 2.734 2.651 2.57 2.491 2.415 2.341 2.269 2.199 2.131 2.065 2.002 1.94 1.88 1.822 1.765 1.71 1.657 1.606 1.556 1.508 1.461 1.415 1.371 1.329 1.287 1.247 1.208 1.171 1.134 1.099 1.064 1.031 0.999 0.968 0.938 0.908 0.88 0.852 0.826 0.8 0.775 0.751 0.727 0.704 0.682 0.661 0.64 0.62 0.601 0.582 0.564 0.546 0.529 0.513 0.497 0.481 0.466 0.451 0.437 0.424 0.41 0.397 0.385 0.373 0.361 0.35 0.339 0.328 0.318

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="0.986" PeakHeight="110.0" Num="3" Error="0.0">
-26.443 7.932 -1.203
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="0.986" EndFrequency="10.15" PeakHeight="377.624" Num="5" zHalfNm="310.5" Error="3.967">
-192.207 -37.913 18.095 -7.051 3.236
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="51.784" Depth="0.217"/>
<TopsideChapman PeakHeight="377.624" PeakDensity="1278194.8" PeakScaleHeight="49.08" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
