CEDAR email: AOGS 2026: ST 21 - Response of Geomagnetic Field and Global Thermosphere-Ionosphere System to ICMEs and CIRs

[Manu Varghese]

Dear Colleagues,
We are pleased to invite abstracts to the session ST-21 titled 'Response of Geomagnetic Field and Global Thermosphere-Ionosphere System to ICMEs and CIRs' in the upcoming AOGS 2026 conference in Fukuoka, Japan, during 02-07 August, 2026. Abstract submission deadline on 23 January, 2026.
Session Description:
Following the impact of interplanetary coronal mass ejection (ICME) and co-rotating interaction region (CIR) at the magnetopause and dayside and nightside magnetic reconnections, the earth’s environment undergoes large temporal changes lasting several days. The changes in the geomagnetic field include geomagnetic storms/activities and substorms. Auroras become intense and extend to lower latitudes and become visible in mid and low latitudes known as low-latitude auroras. Strong high latitude electric field penetrate to the equatorial ionosphere through the ionosphere-ground wave guide as prompt penetration electric field (PPEF). Intense auroral heating expands the thermosphere causing equatorward and westward neutral winds and waves (TADs), and increase the thermospheric total mass density and decrease the atomic oxygen to molecular nitrogen (O/N2) ratio at ionospheric heights with its (small) increase at low latitudes of downwelling. The PPEF and equatorward neutral wind together cause strong F3 layer, travelling ionospheric disturbances (TIDs), ionospheric irregularities and ionospheric storms. Positive (followed by negative) ionospheric storms occur in longitudes of daytime main phase (MP) of the geomagnetic storms. In longitudes of nighttime MP, the decrease in O/N2 ratio becomes effective and negative ionospheric storms occur. The evening nighttime spread-F, plasma bubbles and scintillations at low latitudes become intense and extend to higher latitudes. In polar ionosphere, the tongue-of-ionization and plasma patches and irregularities become strong. This session provides a platform to present and discuss all these and other related aspects studied using ground- and space-based observations, theory and modelling. 
Conveners: V. Manu, Y. Otsuka, Shreedevi P. R., Xing Zanyang, Jijin K. Raj
Please feel free to contact me at manuvarghese at nssc.ac.cn in case of any inquiries.
Best regards,Manu Varghese, Ph.D.National Space Science Center,Beijing, China.

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