Effects of geomagnetic storm on low latitude ionospheric total electron content: A case study from Indian sector

Chakraborty, Monti; Kumar, Sanjay; De, B. K.; Guha, Anirban

doi:10.1007/s12040-015-0588-3

Cited by 43 publications

(21 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2 and 3) and shifting of the crests in the direction of the poles observed in Fig. 4, as previously mentioned and suggested by many studies (e.g., Tsurutani et al, 2004;Mannucci et al, 2005;Astafyeva, 2009;Astafyeva et al, 2014;Chakraborty et al, 2015), the mechanism at work is the ionospheric super-fountain effect. Finally, it is also worth mentioning that this would be the second time a LTE has been detected since 2016, as the first one was the one observed during the 20 April 2018 geomagnetic storm (Sotomayor-Beltran, 2018).…”

Section: Creation Of 8 September 2017 Ltesupporting

confidence: 81%

“…A recent study by Lei et al (2018), using diverse instruments (e.g., satellites and ionosondes), has also observed this TEC enhancement in the Asian-Australian region for this geomagnetic storm. The increment of VTEC in the EIA was already observed in previous studies about ionospheric responses to geomag- netic storms (e.g., Zhao et al, 2005;Pedatella et al, 2009;Astafyeva et al, 2015;Chakraborty et al, 2015).…”

Section: Gim Mapssupporting

confidence: 74%

See 1 more Smart Citation

Emergence of a localized total electron content enhancement during the severe geomagnetic storm of 8 September 2017

Sotomayor-Beltran

2019

Ann. Geophys.

View full text Add to dashboard Cite

Abstract. In this work, the results of the analysis on total electron content (TEC) data before, during and after the geomagnetic storm of 8 September 2017 are reported. One of the responses to geomagnetic storms due to the southern vertical interplanetary magnetic field (Bz) is the enhancement of the electron density in the ionosphere. Vertical TEC (VTEC) from the Center for Orbit determination in Europe (CODE) along with a statistical method were used to identify positive and/or negative ionospheric storms in response to the geomagnetic storm of 8 September 2017. When analyzing the response to the storm of 8 September 2017 it was indeed possible to observe an enhancement of the equatorial ionization anomaly (EIA); however, what was unexpected was the identification of a local TEC enhancement (LTE) to the south of the EIA (∼40∘ S, right over New Zealand and extending towards the southeastern coast of Australia and also eastward towards the Pacific). This was a very transitory LTE that lasted approximately 4 h, starting at ∼ 02:00 UT on 8 September where its maximum VTEC increase was of 241.2 %. Using the same statistical method, comparable LTEs in a similar category geomagnetic storm, the 2015 St. Patrick's Day storm, were looked for. However, for the aforementioned storm no LTEs were identified. As also indicated in a past recent study for a LTE detected during the 15 August 2015 geomagnetic storm, an association between the LTE and the excursion of Bz seen during the 8 September 2017 storm was observed as well. Furthermore, it is very likely that a direct impact of the super-fountain effect along with traveling ionospheric disturbances may be playing an important role in the production of this LTE. Finally, it is indicated that the 8 September 2017 LTE is the second one to be detected since the year 2016.

show abstract

Section: Creation Of 8 September 2017 Ltesupporting

confidence: 81%

Section: Gim Mapssupporting

confidence: 74%

Emergence of a localized total electron content enhancement during the severe geomagnetic storm of 8 September 2017

Sotomayor-Beltran

2019

Ann. Geophys.

View full text Add to dashboard Cite

show abstract

“…Furthermore, the equatorial latitude station Nazret, NAZR (8.57 ∘ N, 39.29 ∘ E; 0.25 ∘ S, geomagnetic) was also considered to study ionospheric response. The ionospheric storm effects observed from the low-latitude regions can be explained by electrodynamic effects (PPEF and DDEF) and mechanical effects (such as thermospheric composition changes and storm-induced equatorward neutral wind effect) (Buonsanto, 1999;Chakraborty et al, 2015;Mendillo, 2006;Prölss, 1995). Figure 8 shows the ionospheric storm effects distributions for low and equatorial latitude stations, MBAR, SHEB, and NAZR, which are located within EIA.…”

Section: Low and Equatorial Ionospheric Responsementioning

confidence: 99%

Ionospheric Responses to CME‐ and CIR‐Driven Geomagnetic Storms Along 30°E–40°E Over the African Sector From 2001 to 2015

Matamba

Habarulema

2018

Space Weather

View full text Add to dashboard Cite

In this paper, we present the responses of the ionospheric total electron content (TEC) to coronal mass ejection (CME)‐ and corotating interaction region (CIR)‐driven storms using stations that lie within 30°E–40°E geographic longitude in middle, low, and equatorial latitudes over the African sector. CIR‐driven storms are generally weak (−50 nT < Dst < −25 nT) to moderate (−100 nT < Dst < −50 nT) in intensity, while CME‐driven storms are often associated with the intense (Dst < −100 nT) geomagnetic storms. CIR‐driven storms have long recovery phase as compared to CME‐driven storms. CME‐ and CIR‐driven storms were classified based on the features of proton temperature, magnetic field, solar wind speed, and proton density. The storm periods analyzed occurred during the period 2001–2015, which covers part of solar cycles 23 and 24. Disturbance storm time (Dst) ≤ −30 nT and Kp ≥ 3 indices were used simultaneously to identify the storm periods considered. The total number of CME‐ and CIR‐driven storms identified was 148 and 167, respectively. However, due to lack of TEC data, the number of CME‐ and CIR‐driven storms considered for the middle‐latitude, low‐latitude, and equatorial latitude stations are different for different regions. TEC data used in this study was derived from the Global Navigation Satellite System observations. The statistical analysis of ionospheric storm effects were compared over middle, low, and equatorial latitudes in the African sector for the first time. Negative ionospheric storm effects occurred only during CME‐driven storms over midlatitude stations and were more prevalent in summer. For the low and equatorial latitudes, negative ionospheric storm effects were observed during both CME‐ and CIR‐driven storms. Our analysis has shown that positive ionospheric storm effects were more prevalent over middle, low, and equatorial latitudes during both CME‐ and CIR‐driven storms. A significant number of cases where the electron density changes remained within the background variability during storm conditions were observed over the low‐latitude stations compared to other latitude regions.

show abstract

“…Shagimuratov et al (2002) reported large and medium level irregularities in TEC variations over high-latitude regions of ionosphere during storm time. Chackraborty et al (2015) investigated the impact of geomagnetic activities on TEC and observed TEC variations significantly, especially in the equatorial region and EIA region, during the geomagnetic storms. The ionospheric effects to the strongest geomagnetic storm have resulted in complex effects around the Earth (Astafyeva et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Comparison of Variations of TEC at Disturbed and Quiet Time Using Nonlinear Dynamics Tools

Eapen¹,

Asokan²,

Kumar

et al. 2018

JGR Space Physics

View full text Add to dashboard Cite

We analyze the underlying dynamics at three different latitudes of ionosphere through total electron content‐series for 4 months. The global dynamics reconstructed from the data is shown to be deterministic with low dimensional chaotic attractors at all the locations, and the dynamics is seen to be less complex at the midlatitude station with smaller dimension of correlation (CD) and maximum Lyapunov exponent (MLE). The influence of geomagnetic storms on the ionospheric dynamics is studied, by analyzing the local dynamics during disturbed and quiet periods, reconstructed from segments of total electron content‐series of shorter duration. With positive MLEs and smaller CDs, the local dynamics is seen to be deterministic and chaotic at the low latitude, midlatitude, and high latitude during both the disturbed and quiet days. However, it is interesting to observe that the dynamics is less chaotic and complex during the disturbed days of the entire period of observation compared to the adjacent quiet days at the three locations. This is further evidenced by sample predictions made using nonlinear tools, yielding better predictions during storms. The smaller CD value during disturbed periods indicates that the geomagnetic activities tend to make a few of the variables dominant enough to control the essential dynamics of the system. Further, the MLEs of the disturbed days are found to increase nearly in a linear fashion from beginning to end of the observation period at all the locations considered. This is an indication of the strong influence of geomagnetic activities on the ionosphere and might have caused the restructuring of the ionospheric dynamics.

show abstract

Effects of geomagnetic storm on low latitude ionospheric total electron content: A case study from Indian sector

Cited by 43 publications

References 40 publications

Emergence of a localized total electron content enhancement during the severe geomagnetic storm of 8 September 2017

Emergence of a localized total electron content enhancement during the severe geomagnetic storm of 8 September 2017

Ionospheric Responses to CME‐ and CIR‐Driven Geomagnetic Storms Along 30°E–40°E Over the African Sector From 2001 to 2015

Comparison of Variations of TEC at Disturbed and Quiet Time Using Nonlinear Dynamics Tools

Contact Info

Product

Resources

About