Impact of two severe geomagnetic storms on the ionosphere over Indian longitude sector during March-April 2023

Rajana, Siva Sai Kumar; Panda, Sampad Kumar; Jade, Sridevi; Vivek, Chiranjeevi G.; Upadhayaya, A. K.; Bhardwaj, Arti; Jorphail, Sonam; Seemala, Gopi Krishna

doi:10.1007/s10509-024-04268-9

Cited by 7 publications

(9 citation statements)

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“…Postsunset ROTI values at the LCK4 station, located outside the northern crest of the EIA region, remained at background levels during both quiet and storm periods. At all three stations, the values stayed insignificant (ROTI < 0.1 TECU/min) during the post-sunset hours of the storm recovery day, consistent with Rajana et al [26]. In the East Asian longitude sector, ionospheric irregularities remained at minimum levels before the storm's onset, as seen in Figure 6b.…”

Section: Asian Sectorsupporting

confidence: 89%

“…Solar cycle 25 is expected to reach peak levels earlier than estimated at the beginning of the cycle [26]. Severe geomagnetic storms have already been reported in the ascending phase of the solar cycle, causing significant ionospheric disturbances.…”

Section: Introductionmentioning

confidence: 97%

“…The negative or positive ionospheric storm-time variations are also documented during different phases of geomagnetic storms. The dayside dominant PPEF shifts the equatorial ionization anomaly (EIA) crests to higher latitude; conversely, DDEF or prompt electric field under over-shielding conditions ceases the fountain effect due to downward drifts [26][27][28]. Moreover, positive storm effect at equatorial and negative ionospheric disturbances at low-mid latitudes are also attributed to the variations in thermospheric O/N 2 [29,30].…”

Section: Introductionmentioning

confidence: 99%

“…Hence, a detailed understating of ionospheric variations helps researchers to make predictions for the rest of the solar cycle. Recent studies have reported results from February and April 2023 events [13,26,30,33,39]. Oyama et al [40] investigated the thermospheric winds in the European sector and Rajana et al [26] reported the ionospheric response over the Indian longitude sector during the March 2023 storm, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…Recent studies have reported results from February and April 2023 events [13,26,30,33,39]. Oyama et al [40] investigated the thermospheric winds in the European sector and Rajana et al [26] reported the ionospheric response over the Indian longitude sector during the March 2023 storm, respectively. To our understanding, the analysis results of the ionospheric response in the American and East Asian sectors during the March 2023 storm have not been reported before.…”

Section: Introductionmentioning

confidence: 99%

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Multi-Instrument Observation of the Ionospheric Irregularities and Disturbances during the 23–24 March 2023 Geomagnetic Storm

Tahir,

Wu,

Shah

et al. 2024

Remote Sensing

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This work investigates the ionospheric response to the March 2023 geomagnetic storm over American and Asian sectors from total electron content (TEC), rate of TEC index, ionospheric heights, Swarm plasma density, radio occultation profiles of Formosat-7/Cosmic-2 (F7/C2), Fabry-Perot interferometer driven neutral winds, and E region electric field. During the storm’s main phase, post-sunset equatorial plasma bubbles (EPBs) extend to higher latitudes in the western American longitudes, showing significant longitudinal differences in the American sector. Over the Indian longitudes, suppression of post-sunset irregularities is observed, attributed to the westward prompt penetration electric field (PPEF). At the early recovery phase, the presence of post-midnight/near-sunrise EPBs till post-sunrise hours in the American sector is associated with the disturbance of dynamo-electric fields (DDEF). Additionally, a strong consistency between F7/C2 derived amplitude scintillation (S4) ≥ 0.5 and EPB occurrences is observed. Furthermore, a strong eastward electric field induced an increase in daytime TEC beyond the equatorial ionization anomaly crest in the American region, which occurred during the storm’s main phase. Both the Asian and American sectors exhibit negative ionospheric storms and inhibition of ionospheric irregularities at the recovery phase, which is dominated by the disturbance dynamo effect due to equatorward neutral winds. A slight increase in TEC in the Asian sector during the recovery phase could be explained by the combined effect of DDEF and thermospheric composition change. Overall, storm-time ionospheric variations are controlled by the combined effects of PPEF and DDEF. This study may further contribute to understanding the ionospheric responses under the influence of storm-phase and LT-dependent electric fields.

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Section: Asian Sectorsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 97%