<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-02 -033 17:00:00.000"
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 44 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 45% PACIFIC flags: F2x cusp not found, 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" >
2026.02.02 (033) 17:00:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.13" 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">
FF202603302021700009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="29" >
<URSI ID="00" Val="10.700" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.450" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="26.216" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="4.250" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="8.800" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="7.700" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="11.000" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="400.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="400.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="120.000" 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="10.100" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="531.714" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="3.248" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="7.700" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="7.700" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.294" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="369.671" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="244.852" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.109" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="4.250" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="159.370" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="53.514" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="86.818" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="204.120" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.290" Name="B1" QL="/" DL="/" />
<URSI ID="32" Val="7.700" Name="fbEs" Units="MHz" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="61">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
400.000 405.000 405.000 407.500 410.000 415.000 415.000 420.000 420.000 423.125 426.250 429.375 432.500 435.625 438.750 441.875 445.000 448.125 451.250 454.375 457.500 460.625 463.750 466.875 470.000 475.000 475.000 480.000 480.000 485.000 485.000 490.000 490.000 495.000 495.000 497.500 500.000 505.000 505.000 510.000 510.000 515.000 515.000 520.000 520.000 525.000 525.000 528.190 531.714 535.628 540.000 544.916 550.484 556.842 564.172 572.716 582.801 594.887 609.635 628.031 651.622
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 48 51 0 54 57 57 63 60 0 0 0 0 0 0 0 0 0 0 54 0 0 0 0 48 48 51 54 54 51 57 54 57 54 57 0 57 0 54 0 54 0 0 0 57 51 48 54 48 45 54 45 51 51 42 48 48 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 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 -0.390625 -1.171875 -0.390625 -1.171875 -0.390625 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -0.390625 -1.171875 -1.171875 -0.390625 -0.390625 -1.171875 -1.171875 -1.171875 0.390625 -1.171875 -1.171875 -2.734375 1.953125 -2.734375 -2.734375
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="92">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
130.000 125.000 125.000 125.000 124.167 123.333 122.500 121.667 120.833 120.000 120.000 120.000 115.000 115.000 114.762 114.524 114.286 114.048 113.810 113.571 113.333 113.095 112.857 112.619 112.381 112.143 111.905 111.667 111.429 111.190 110.952 110.714 110.476 110.238 110.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 112.500 110.000 110.000 120.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 114.286 113.571 112.857 112.143 111.429 110.714 110.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 110.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
45 48 0 51 0 0 0 48 0 48 48 48 45 45 0 0 48 0 0 0 0 0 0 57 0 0 63 0 0 51 0 0 0 0 45 72 69 0 60 0 0 0 0 48 0 0 0 66 69 57 66 66 0 66 66 66 66 69 0 66 57 54 69 0 69 0 0 69 0 66 63 69 0 0 0 0 63 0 60 69 72 0 0 66 63 60 63 0 57 63 60 60
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-1.953125 -0.390625 2.734375 0.390625 -0.390625 0.390625 -0.390625 -0.390625 2.734375 -0.390625 -0.390625 -0.390625 0.390625 1.171875 0.390625 -0.390625 -2.734375 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 1.953125 -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 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
</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" >
89.505 90.0 95.0 100.0 105.0 110.0 112.139 114.279 115.0 116.418 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 369.671 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.239 2.185 2.811 3.142 3.248 3.126 3.126 3.167 3.248 3.351 3.504 3.665 3.835 4.013 4.196 4.384 4.573 4.763 4.952 5.139 5.323 5.503 5.68 5.853 6.023 6.19 6.353 6.513 6.671 6.826 6.979 7.129 7.278 7.425 7.57 7.714 7.857 7.999 8.14 8.281 8.42 8.559 8.698 8.837 8.975 9.113 9.251 9.388 9.526 9.663 9.8 9.935 10.069 10.199 10.324 10.441 10.545 10.628 10.683 10.7 10.7 10.696 10.686 10.669 10.646 10.617 10.582 10.542 10.497 10.447 10.392 10.333 10.27 10.203 10.132 10.058 9.981 9.901 9.817 9.732 9.644 9.553 9.461 9.367 9.271 9.173 9.074 8.975 8.873 8.771 8.669 8.565 8.461 8.357 8.252 8.147 8.042 7.936 7.831 7.726 7.621 7.517 7.413 7.309 7.205 7.102 7.0 6.898 6.797 6.697 6.598 6.499 6.401 6.304 6.208 6.112 6.018 5.925 5.832 5.741 5.65 5.561 5.472 5.385 5.298 5.213 5.129 5.046 4.963 4.882 4.802 4.723 4.645 4.569 4.493 4.418 4.344 4.272 4.2 4.13 4.06 3.992 3.924 3.858 3.792 3.728 3.665 3.602 3.541 3.48 3.42 3.362 3.304 3.247 3.191 3.136 3.082 3.029 2.976 2.925 2.874 2.824 2.775 2.727 2.679 2.633 2.587 2.541 2.497 2.453 2.41 2.368 2.327 2.286 2.246 2.207 2.168 2.13 2.092 2.055 2.019 1.984 1.949 1.914 1.881 1.848 1.815

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.248" PeakHeight="110.0" Num="3" Error="0.0">
-30.395 12.995 -3.095
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.248" EndFrequency="10.7" PeakHeight="369.671" Num="5" zHalfNm="244.852" Error="1.743">
-222.181 -52.822 31.543 -11.152 1.359
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="6.418" Depth="0.122"/>
<TopsideChapman PeakHeight="369.671" PeakDensity="1420471.5" PeakScaleHeight="86.818" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
