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Dear colleagues,</div>
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We would like to invite contributions to the following session at European Space Weather Week 2026, to be held 2–6 November 2026 in Florence, Italy, in hybrid format.</div>
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<b>MIT2 – Cross-scale GNSS-based monitoring of ionospheric irregularities: from physics to operational space weather services</b></div>
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<b>Conveners:</b> Sarah Beeck, Tibor Durgonics, and Cathryn Mitchell</div>
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Ionospheric irregularities span a wide range of spatial and temporal scales and remain a major source of uncertainty for space-weather monitoring, forecasting, and operational services, particularly for systems relying on GNSS-based positioning, navigation,
and timing. These effects are especially important at high latitudes, where auroral and polar-cap processes produce strong ionospheric structuring, but they are also relevant at equatorial and mid-latitude regions during disturbed conditions.</div>
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This session invites contributions on the observation, characterization, modeling, and operational use of GNSS-based measurements of ionospheric irregularities across scales. We particularly welcome studies addressing:</div>
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scintillation indices, TEC, ROTI, phase fluctuations, and TEC gradients;</li><li style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
multi-frequency and multi-constellation GNSS observations;</li><li style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
dense receiver networks and regional/global mapping approaches;</li><li style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
GNSS radio occultation and limb-viewing diagnostics;</li><li style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
integration of ground-based GNSS with complementary observations such as radio occultation, ionosondes, radars, and other geospace measurements;</li><li style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
data assimilation, data fusion, nowcasting, forecasting, validation, and uncertainty quantification;</li><li style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
generation, morphology, dynamics, and impacts of ionospheric irregularities;</li><li style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
research-to-operations developments and user-oriented space-weather services.</li></ul>
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Our goal is to bring together observational, modeling, theoretical, and operational perspectives on GNSS-based irregularity monitoring, with emphasis on how cross-scale scientific understanding can support robust space-weather services.</div>
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The abstract submission deadline for oral contributions and Live Forecasts proposals has been extended to
<b>21 May 2026</b>. Poster submissions remain possible later according to the ESWW timeline.</div>
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Abstract submission and session information are available through the <a href="https://esww2026.eswan.eu/conference/abstract-submission" title="https://esww2026.eswan.eu/conference/abstract-submission">
ESWW 2026 website</a>.</div>
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We look forward to receiving your contributions and to seeing many of you in Florence.</div>
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Best regards,<br>
Sarah Beeck, Tibor Durgonics, and Cathryn Mitchell</div>
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