Geomagnetic signatures of sudden ionospheric disturbances during extreme solar radiation events

Дмитриев, А. В.; Yeh, Hund‐Der

doi:10.1016/j.jastp.2008.05.008

Cited by 18 publications

(12 citation statements)

References 24 publications

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“…The longitudinal variability in occurrence of counter electrojet has also been investigated in the past (Alex and Mukherjee, 2001). Geomagnetic signatures of sudden ionospheric disturbances during extreme solar radiation events are discussed by Dmitriev and Yeh (2008). They have considered solar energetic protons also as a source of ionization of the ionosphere and upper atmosphere, especially at high and mid latitudes.…”

Section: Resultsmentioning

confidence: 99%

Electrodynamical response of the Indian low-mid latitude ionosphere to the very large solar flare of 28 October 2003 – a case study

et al. 2009

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Abstract. The electrodynamic effects on the low-mid latitude ionospheric region have been investigated using GPS (global positioning system) data, ionosonde data and H values, during the very large solar flare (X17.2/4B) of 28 October 2003. The results bring out the flare induced unusual behaviour of the equatorial ionosphere on this day just prior to sunset. The important observations are i) Large and prolonged N e enhancements observed from ionosonde data just after the flare-related peak enhancement in EUV flux. The observed enhancement in N e is due to the increase in ionization production due to the enhanced EUV flux and the persistence of the enhancement is probably due to the prompt penetration related upliftment of the F layer (just prior to the flare peak phase) to higher altitudes, where recombination rates are lower. ii) A significant enhancement in total electron content (TEC) (∼10 TEC units) at regions around the Equatorial Ionization Anomaly (EIA) crest region (Ahmedabad) during the flare in association with the flare related EUV flux enhancement. iii) Similar enhancements seen at stations of Jodhpur and Delhi in the mid latitude sector. iv)The flare related flux enhancements in different longitude sectors in the equatorial electrojet region have been shown to produce positive and negative variations in electrojet strength indicating the presence of current systems having positive and negative polarities in different longitude sectors. Thus the flare effect reveals the longitudinal variation of the counter electrojet events in the Equatorial Electrojet (EEJ) region.

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Section: Resultsmentioning

confidence: 99%

Electrodynamical response of the Indian low-mid latitude ionosphere to the very large solar flare of 28 October 2003 – a case study

et al. 2009

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“…The variation d H is a module of the vector subtraction of a linear trend ( H t ), interpolated between points at 0400 and 0530 UT, from the observed vector H :

d H = | \vec{H} - {\overset{H}{true}}_{t} |

. By definition, the magnitude of d H is always positive and sensitive to changes in the external electric currents impacting both the strength and the orientation of the magnetic field [ Dmitriev and Yeh , 2008].…”

Section: Ground‐based Magnetic Variationsmentioning

confidence: 99%

Traveling magnetopause distortion related to a large‐scale magnetosheath plasma jet: THEMIS and ground‐based observations

Дмитриев¹,

Suvorova²

2012

J. Geophys. Res.

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[1] Here, we present a case study of THEMIS and ground-based observations of the perturbed dayside magnetopause and the geomagnetic field in relation to the interaction of an interplanetary directional discontinuity (DD) with the magnetosphere on 16 June 2007. The interaction resulted in a large-scale local magnetopause distortion of an "expansion -compression -expansion" (ECE) sequence that lasted for $15 min. The compression was caused by a very dense, cold, and fast high-b magnetosheath plasma flow, a so-called plasma jet, whose kinetic energy was approximately three times higher than the energy of the incident solar wind. The plasma jet resulted in the effective penetration of magnetosheath plasma inside the magnetosphere. A strong distortion of the Chapman-Ferraro current in the ECE sequence generated a tripolar magnetic pulse "decrease -peak-decrease" (DPD) that was observed at low and middle latitudes by some ground-based magnetometers of the INTERMAGNET network. The characteristics of the ECE sequence and the spatial-temporal dynamics of the DPD pulse were found to be very different from any reported patterns of DD interactions with the magnetosphere. The observed features only partially resembled structures such as FTE, hot flow anomalies, and transient density events. Thus, it is difficult to explain them in the context of existing models.Citation: Dmitriev, A. V., and A. V. Suvorova (2012), Traveling magnetopause distortion related to a large-scale magnetosheath plasma jet: THEMIS and ground-based observations,

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“…For both Mars and Earth, different types of effects are expected for the different components of a storm. For example, at Earth the plasma and field disturbance produces a geomagnetic storm and associated aurora, radiation belt enhancements and ionospheric disturbances [e.g., Dmitriev and Yeh , 2008; Green et al , 2006], while the SEP event produces additional ionization in the polar cap and ozone destruction in the mesosphere and sometimes down to the stratosphere [e.g., Tsurutani et al , 2005; Cully et al , 2003].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Mars' ionospheric response to solar energetic particle events

Uluşen¹,

Brain²,

Luhmann³

et al. 2012

J. Geophys. Res.

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[1] We investigate the effects of solar energetic particle (SEP) events on the Martian ionosphere using observations from the Mars Global Surveyor (MGS) Electron Reflectometer (ER) and Radio Science (RS) experiments. Although MGS/ER is not designed to measure solar storm particles, it detects SEPs as increased instrument background. Using this proxy for SEP fluxes near Mars, we compare electron density profiles obtained from the RS experiment during periods of high and low SEP activity. Six case studies show no clear evidence for an increase in the ionospheric electron density between 200 and 100 km altitudes. However, 4 of the 6 events show a small increase in electron density below 100 km altitude during SEP events, suggesting that high-energy (10-20 keV) electrons may cause ionization in the lower ionosphere. We also observe an $25% decrease in the ionospheric electron density between $100 and $120 km altitude for the two strongest events, suggesting that SEPs trigger a process that increases electron loss in this altitude range of the lower ionosphere. However, we cannot be confident from only two events that this effect is caused directly or indirectly by increased SEP fluxes. A statistical study confirms the case study results, but not over all solar zenith angles. Additionally, we observe depletions in the topside ionospheric electron density at some solar zenith angles, which can be explained by compression of the ionosphere by the passing CME.

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Geomagnetic signatures of sudden ionospheric disturbances during extreme solar radiation events

Cited by 18 publications

References 24 publications

Electrodynamical response of the Indian low-mid latitude ionosphere to the very large solar flare of 28 October 2003 – a case study

Electrodynamical response of the Indian low-mid latitude ionosphere to the very large solar flare of 28 October 2003 – a case study

Traveling magnetopause distortion related to a large‐scale magnetosheath plasma jet: THEMIS and ground‐based observations

Investigation of Mars' ionospheric response to solar energetic particle events

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