<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-22 -053 20:00:00.000"
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="1 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" >
2026.02.22 (053) 20:00:00</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">
FF202605302222000009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="30" >
<URSI ID="00" Val="11.500" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.537" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="29.173" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.350" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="4.000" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.600" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="2.350" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="2.410" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="11.800" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="285.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="285.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="119.506" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="110.000" 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="10.700" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="491.667" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="2.311" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.600" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.600" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="382.147" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="294.097" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.476" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="3.200" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="120.827" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="47.325" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="65.034" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="153.310" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.190" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="3">
<Trace Type="standard" Layer="F2" Polarization="O" Num="139">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
285.000 287.500 290.000 291.667 293.333 295.000 297.500 300.000 302.500 305.000 300.000 310.000 305.000 310.000 315.000 316.667 318.333 320.000 315.000 320.000 320.000 325.000 325.000 330.000 330.000 330.000 335.000 335.000 335.000 335.000 337.000 339.000 341.000 343.000 345.000 350.000 350.000 355.000 357.500 360.000 360.000 362.500 365.000 367.500 370.000 370.000 375.000 375.000 375.000 380.000 380.000 380.000 380.000 382.500 385.000 390.000 390.000 395.000 400.000 400.000 400.000 405.000 405.000 405.000 405.000 405.000 410.000 410.000 415.000 415.000 415.000 415.000 415.000 420.000 420.000 420.000 420.000 420.000 425.000 425.000 425.000 425.000 425.000 430.000 430.000 430.000 430.000 430.000 430.000 430.000 430.000 430.000 435.000 435.000 435.000 440.000 441.667 443.333 445.000 445.000 445.000 447.500 450.000 450.000 450.000 452.500 455.000 455.000 460.000 460.000 465.000 465.000 465.000 465.000 470.000 475.000 475.000 480.000 480.000 485.000 485.000 488.333 491.667 495.000 500.000 505.000 510.000 510.000 515.000 519.509 524.495 530.038 536.238 543.217 551.134 560.191 570.651 582.871 597.334
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
63 57 63 0 0 63 0 0 0 48 63 51 0 0 48 0 0 48 0 60 63 63 69 54 0 63 51 66 69 54 0 69 0 45 69 63 69 60 0 60 66 48 63 51 54 63 54 60 69 57 63 69 69 0 69 66 72 66 54 63 72 57 63 69 69 66 69 72 69 72 72 69 66 69 69 66 66 63 69 69 69 69 66 63 69 69 66 66 66 66 60 54 66 66 66 66 0 0 63 0 63 0 57 63 63 0 60 63 51 60 48 54 57 57 57 48 54 48 54 48 51 0 0 51 0 48 45 51 0 51 51 48 0 48 48 45 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 -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 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 1.953125 -1.171875 -1.171875 -1.171875 -0.390625 -0.390625 -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 2.734375 -1.171875 -2.734375 -1.171875 -1.171875 -1.171875 1.953125 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 2.734375 -1.171875
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="2">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.35 2.4
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
119.506 123.021
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="17">
<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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
72 69 69 69 0 0 66 78 75 0 0 75 72 69 69 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
</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" >
89.659 90.0 95.0 100.0 105.0 110.0 115.0 116.544 120.0 123.089 125.0 129.633 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 382.147 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.229 1.618 2.087 2.332 2.41 2.334 2.278 2.278 2.278 2.317 2.41 2.422 2.582 2.737 2.889 3.04 3.19 3.341 3.492 3.644 3.797 3.952 4.109 4.267 4.428 4.59 4.755 4.921 5.091 5.262 5.436 5.613 5.793 5.975 6.159 6.347 6.538 6.731 6.928 7.127 7.33 7.535 7.744 7.956 8.171 8.389 8.61 8.833 9.059 9.287 9.517 9.747 9.978 10.206 10.431 10.648 10.855 11.046 11.214 11.35 11.447 11.495 11.5 11.498 11.484 11.458 11.42 11.372 11.313 11.244 11.167 11.081 10.987 10.886 10.779 10.666 10.547 10.423 10.295 10.163 10.027 9.888 9.747 9.603 9.457 9.31 9.161 9.011 8.861 8.71 8.559 8.408 8.258 8.107 7.958 7.809 7.661 7.514 7.369 7.224 7.081 6.94 6.8 6.662 6.526 6.391 6.258 6.127 5.998 5.871 5.746 5.623 5.502 5.383 5.266 5.152 5.039 4.928 4.819 4.712 4.608 4.505 4.404 4.305 4.209 4.114 4.021 3.93 3.84 3.753 3.667 3.584 3.501 3.421 3.343 3.266 3.19 3.117 3.045 2.974 2.906 2.838 2.772 2.708 2.645 2.583 2.523 2.464 2.407 2.35 2.295 2.242 2.189 2.138 2.088 2.039 1.991 1.944 1.899 1.854 1.81 1.768 1.726 1.686 1.646 1.607 1.569 1.532 1.496 1.461 1.426 1.393 1.36 1.328 1.296 1.266 1.236 1.206 1.178 1.15 1.123 1.096 1.07 1.045 1.02 0.996 0.973

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.41" PeakHeight="110.0" Num="3" Error="0.0">
-29.612 11.867 -2.596
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.41" EndFrequency="11.5" PeakHeight="382.147" Num="5" zHalfNm="294.097" Error="2.088">
-210.618 -59.364 18.993 -1.915 0.39
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="19.633" Depth="0.132"/>
<TopsideChapman PeakHeight="382.147" PeakDensity="1640818.9" PeakScaleHeight="65.034" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
