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<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif">Dear colleagues,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif">CODE has been generating ionospheric predictions (Global Ionosphere Maps in IONEX data format) for a long time. An updated version of <a href="https://files.igs.org/pub/resource/guidelines/Guidelines_for_Long_Product_Filenames_in_the_IGS_v2.2_EN.pdf" target="_blank">Guidelines_for_Long_Product_Filenames_in_the_IGS_v2.2_EN.pdf</a> now
allows, specifically for predicted product files (see 'Pnu'), to map the short filenames to long ones. The old/new naming convention used for the two product lines, predictions 1 day ahead and 2 days ahead, is as follows:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="font-size:10.0pt;font-family:"Arial",sans-serif"> c1pg{ddd}0.{yy}i.Z > COD0OPSP0D_{yyyyddd}0000_01D_01H_GIM.INX.gz<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="font-size:10.0pt;font-family:"Arial",sans-serif"> c2pg{ddd}0.{yy}i.Z > COD0OPSP1D_{yyyyddd}0000_01D_01H_GIM.INX.gz<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif"> </span><span lang="EN" style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="font-size:10.0pt;font-family:"Arial",sans-serif">We are currently using both naming conventions. Furthermore, we have uploaded all corresponding daily files with long filenames from the official transition date (2022:331)
onwards. In order to allow users a transition period, we are now waiting until mid of September 2026, when the old file versions (c[12]pg{ddd}0.{yy}.Z) are scheduled to be permanently removed from the CDDIS archive: </span><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif"><a href="https://cddis.nasa.gov/archive/gnss/ionosphere/" target="_blank">https://cddis.nasa.gov/archive/gnss/ionosphere/</a>,
or <a href="https://cddis.nasa.gov/archive/gnss/ionex/" target="_blank">https://cddis.nasa.gov/archive/gnss/ionex/</a>, where the CODE product files mentioned can be found.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif">This change also affects the CODE analysis product archive at AIUB (<a href="https://download.aiub.unibe.ch/" target="_blank">https://download.aiub.unibe.ch/</a><u>)</u>. Please
be reminded once again that our ftp server has been replaced by a cloud-based solution (as announced in <a href="https://lists.igs.org/pipermail/igsmail/2025/008638.html" target="_blank">[IGSMAIL-8642] Server switch for downloading products from AIUB at CODE</a>).<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif">For users of the product category mentioned above, please note that we started making in addition ionosphere predictions 5 days ahead, called<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif"> COD0OPSP4D_{yyyyddd}0000_01D_01H_GIM.INX.gz,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif">publicly available (so far, only at <a href="https://code.aiub.unibe.ch/s3_script/aiub_s3_bucket_listing.php?path=CODE" target="_blank">Index of /CODE</a>). This
product could also be helpful in bridging any service interruptions lasting several days.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif">Additional note: For users who consider CODE GIM.INX files with the label ‘PRD’ from the AIUB archive (i.e., COD0OPSPRD_{yyyyddd}0000_01D_01H_GIM.INX.gz), it is
important to emphasize that these will also be removed/discontinued in mid-September 2026, because these are substituted by the new ‘Pnu’ filenames, where it is now clear which of the predicted product lines (P0D, P1D, P4D) it belongs to.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif">If you have any questions, please feel free to contact us.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="font-size:10.0pt;font-family:"Arial",sans-serif">Best regards,</span><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="font-size:10.0pt;font-family:"Arial",sans-serif">Stefan Schaer</span><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="font-size:10.0pt;font-family:"Arial",sans-serif">(on behalf of the CODE AC group)</span><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
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