<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-01-26 -026 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="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" >
2026.01.26 (026) 20:00:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.12" 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">
FF202602601262000009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="29" >
<URSI ID="00" Val="9.400" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.272" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="21.357" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.650" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="4.700" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.850" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="9.800" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="265.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="265.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="105.000" 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="0.400" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="9.200" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="630.315" 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="2.291" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.850" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.850" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="408.448" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="278.382" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.016" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="2.650" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="170.923" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="42.317" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="88.541" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="213.310" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.300" Name="B1" QL="/" DL="/" />
<URSI ID="32" Val="3.850" Name="fbEs" Units="MHz" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="112">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
265.000 268.333 271.667 275.000 275.000 280.000 285.000 280.000 285.000 290.000 290.000 295.000 295.000 296.667 298.333 300.000 301.667 303.333 305.000 306.667 308.333 310.000 311.667 313.333 315.000 316.667 318.333 320.000 325.000 326.250 327.500 328.750 330.000 335.000 340.000 345.000 345.000 346.667 348.333 350.000 355.000 360.000 360.000 365.000 367.500 370.000 372.500 375.000 380.000 380.000 385.000 390.000 395.000 400.000 405.000 410.000 410.000 415.000 420.000 425.000 425.000 430.000 430.000 435.000 440.000 445.000 450.000 455.000 455.000 465.000 470.000 475.000 475.000 480.000 485.000 485.000 495.000 495.000 500.000 505.000 510.000 515.000 520.000 525.000 530.000 535.000 535.000 545.000 550.000 555.000 560.000 560.000 570.000 570.000 575.000 575.000 585.000 590.000 590.000 595.000 597.802 600.912 604.385 608.288 612.705 617.746 623.553 630.315 638.288 647.830 659.454 673.926
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
63 0 0 54 54 0 54 63 66 60 66 60 60 0 0 0 60 0 60 0 57 0 0 54 0 0 0 57 69 0 51 0 57 66 63 60 63 0 0 66 66 60 66 66 0 0 0 63 66 66 63 60 63 63 63 63 63 63 66 60 66 66 66 63 63 63 63 63 63 60 57 54 66 63 63 63 63 60 63 63 66 66 66 66 66 66 66 66 66 66 63 60 60 66 66 63 63 60 63 63 63 63 63 60 60 60 60 60 60 57 48 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 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -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
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="42">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
105.000 105.000 105.000 105.000 105.000 105.000 105.000 105.000 105.000 105.000 105.000 105.000 105.000 110.000 110.000 108.333 106.667 105.000 105.000 105.000 105.833 106.667 107.500 108.333 109.167 110.000 110.833 111.667 112.500 113.333 114.167 115.000 110.000 125.000 121.667 118.333 115.000 115.000 115.000 115.000 115.000 120.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
63 60 63 0 0 0 0 0 0 0 60 60 57 57 51 0 0 66 63 57 0 0 0 0 0 0 0 0 0 0 0 54 0 51 0 0 54 54 54 0 51 45
</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 -2.734375 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
</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" >
89.686 90.0 95.0 100.0 105.0 110.0 115.0 116.649 120.0 123.298 125.0 129.947 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 408.448 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.227 1.537 1.984 2.217 2.291 2.22 2.164 2.164 2.164 2.197 2.291 2.292 2.4 2.506 2.615 2.726 2.843 2.966 3.097 3.238 3.387 3.547 3.717 3.894 4.078 4.263 4.449 4.632 4.81 4.983 5.15 5.312 5.468 5.619 5.765 5.906 6.044 6.178 6.309 6.438 6.563 6.686 6.808 6.927 7.045 7.162 7.277 7.391 7.505 7.617 7.729 7.841 7.952 8.064 8.175 8.286 8.397 8.509 8.62 8.732 8.843 8.954 9.062 9.166 9.261 9.34 9.389 9.4 9.4 9.395 9.385 9.369 9.348 9.323 9.292 9.257 9.218 9.175 9.127 9.076 9.022 8.964 8.903 8.84 8.773 8.704 8.633 8.559 8.484 8.406 8.327 8.246 8.164 8.08 7.995 7.909 7.823 7.735 7.647 7.558 7.468 7.378 7.288 7.198 7.107 7.017 6.926 6.836 6.745 6.655 6.565 6.475 6.386 6.297 6.209 6.121 6.033 5.946 5.86 5.775 5.69 5.606 5.522 5.439 5.357 5.276 5.196 5.116 5.037 4.96 4.883 4.806 4.731 4.657 4.583 4.51 4.439 4.368 4.298 4.229 4.161 4.093 4.027 3.962 3.897 3.833 3.771 3.709 3.648 3.587 3.528 3.47 3.412 3.355 3.3 3.245 3.19 3.137 3.084 3.033 2.982 2.931 2.882 2.833 2.785 2.738 2.692 2.646 2.601 2.557 2.514 2.471 2.429 2.387 2.346 2.306 2.267 2.228 2.19 2.152 2.115 2.079 2.043 2.008 1.974 1.94 1.906

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.291" PeakHeight="110.0" Num="3" Error="0.0">
-29.469 11.667 -2.512
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.291" EndFrequency="9.4" PeakHeight="408.448" Num="5" zHalfNm="278.382" Error="4.618">
-245.793 -56.352 40.441 -22.74 5.943
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="19.947" Depth="0.127"/>
<TopsideChapman PeakHeight="408.448" PeakDensity="1096277.9" PeakScaleHeight="88.541" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
