Response of the ionosphere to super geomagnetic storms: Observations and modeling

Lekshmi, D. Vijaya; Balan, N.; Vaidyan, V. K.; Alleyne, H.; Bailey, G. J.

doi:10.1016/j.asr.2007.08.029

Cited by 44 publications

(25 citation statements)

References 28 publications

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“…These currents result in heating of the upper atmosphere through ohmic or joule heating processes. This has a significant impact on the global neutral wind patterns and hence the formation of EIA (Chandra et al 1971;Vijaya Lekshmi et al 2008). Equatorial anomaly is related to electrojet strength (electric field) and suppressed during periods of counter electrojet.…”

Section: Tec Variation During Geomagnetic Quiet and Disturbed Daysmentioning

confidence: 98%

GPS-TEC variations during low solar activity period (2007–2009) at Indian low latitude stations

Kumar

Priyadarshi

Krishna

et al. 2012

Astrophys Space Sci

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Section: Tec Variation During Geomagnetic Quiet and Disturbed Daysmentioning

confidence: 98%

GPS-TEC variations during low solar activity period (2007–2009) at Indian low latitude stations

Kumar

Priyadarshi

Krishna

et al. 2012

Astrophys Space Sci

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“…During this long period strong and moderate geomagnetic perturbations were recorded. Ap index went above 100 at the beginning of November 2004 and many days of perturbed particle fluxes were reported (Lekshmi, 2008). The period 2-11 November was characterised by activity which generated two X-class X-ray flares (Yermolaev et al, 2005) and weak geomagnetic activity was recorded in 5 December (Tverskaya et al, 2006).…”

Section: Noaa Particle Bursts and Earthquakesmentioning

confidence: 99%

Analysis of NOAA particle data and correlations to seismic activity

Fidani

Battiston

2008

Nat. Hazards Earth Syst. Sci.

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Abstract.A decade of NOAA-15 particle flux data offers an opportunity to test claims of correlations between seismic activity and effects on the ionosphere. Over the last two decades, potentially interesting observations in the ionosphere-magnetosphere transition region have been investigated. Specifically these consists of anomalous particle fluxes detected by several space experiments and correlated with the earthquake occurrence. These particle fluxes are characterised by anomalous short-term and sharp increases in high energy particle counting rates, referred to as particle bursts. In this work, more general rules for particle bursts selection have been defined and tested on the NOAA database, for particles inside and outside the South Atlantic Anomaly region. The whole period of ten years burst activity from NOAA-15 database is reported. Data from four satellites, NOAA-15, 16, 17 and 18, were analyzed during periods of solar quiet activity in connection with strong earthquakes, revealing presence of bursts detected on more than one satellite close to the time of the same seismic events. This preliminary study presented here concentrates on periods of major Indonesian earthquakes from 1998 to date, including Sumatra event M=9, during which geomagnetic Ap index was less than 16 and with no sudden ionospheric disturbances. During this period particle burst temporal distributions have shown some correspondence with earthquake times. The limits of the analysis presented in this papers are discussed as well as prospects for future work.

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“…These upward and downward plasma surges create also composition changes by decreasing the ratio of O and N 2 (indicated as O/N 2 ) in the auroral and trough regions and by increasing O/N 2 away from them, respectively [Cander and Mihajlovic, 2005;Wang et al, 2012]. TAD-related downward surges can also turn positive storms into negative storms [Vijaya Lekshmi et al, 2007].…”

Section: Introductionmentioning

confidence: 99%

Positive and negative ionospheric storms occurring during the 15 May 2005 geomagnetic superstorm

Horvath

Lovell

2015

JGR Space Physics

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This study focuses on the 15 May 2005 geomagnetic superstorm and aims to investigate the global variation of positive and negative storm phases and their development. Observations are provided by a series of global total electron content maps and multi‐instrument line plots. Coupled Thermosphere‐Ionosphere‐Plasmasphere electrodynamics (CTIPe) simulations are also employed. Results reveal some sunward streaming plumes of storm‐enhanced density (SED) over Asia and a well‐developed midlatitude trough over North America forming isolated positive and negative storms, respectively. The simultaneous development of positive and negative storms over North America is also shown. Then, some enhanced auroral ionizations maintained by strong equatorward neutral winds appeared in the depleted nighttime ionosphere. Meanwhile, the northern nighttime polar region became significantly depleted as the SED plume plasma could not progress further than the dayside cusp. Oppositely, a polar tongue of ionization (TOI) developed in the daytime southern polar region. According to CTIP simulations, solar heating locally maximized (minimized) over the southern (northern) magnetic pole. Furthermore, strong upward surges of molecular‐rich air created O/N2 decreases both in the auroral zone and in the trough region, while some SED‐related downward surges produced O/N2 increases. From these results we conclude for the time period studied that (1) composition changes contributed to the formation of positive and negative storms, (2) strengthening polar convection and increasing solar heating of the polar cap supported polar TOI development, and (3) a weaker polar convection and minimized solar heating of the polar cap aided the depletion of polar plasma.

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Response of the ionosphere to super geomagnetic storms: Observations and modeling

Cited by 44 publications

References 28 publications

GPS-TEC variations during low solar activity period (2007–2009) at Indian low latitude stations

GPS-TEC variations during low solar activity period (2007–2009) at Indian low latitude stations

Analysis of NOAA particle data and correlations to seismic activity

Positive and negative ionospheric storms occurring during the 15 May 2005 geomagnetic superstorm

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