Low-latitude geomagnetic response to the interplanetary conditions during very intense magnetic storms

Rawat, R.; Alex, S.; Lakhina, G. S.

doi:10.1016/j.asr.2009.01.025

Cited by 6 publications

(7 citation statements)

References 46 publications

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“…Adhikari [] studied about nonstorm HILDCAA event (20–23 April 2003) recorded by the Geomagnetic Observatory of Vassouras and found the eastward‐westward perturbation of interplanetary magnetic field during the event and also found its negative correlation with FAC. The negative cross correlation is basically associated with the phase shift in the variation trend of FAC and E y [ Rawat et al , ]. Such a correlation of FAC and E y may be due to the direct causative role of solar wind electric field in the development of high‐latitude asymmetry [ Clauer et al , ], a consequence of the fundamental interplanetary parameters taking part in the mechanisms.…”

Section: Resultsmentioning

confidence: 99%

Study of field‐aligned current (FAC), interplanetary electric field component (E_y), interplanetary magnetic field component (B_z), and northward (x) and eastward (y) components of geomagnetic field during supersubstorm

Adhikari¹,

Dahal

Chapagain

2017

Earth and Space Science

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A dominant process by which energy and momentum are transported from the magnetosphere to the ionosphere is known as field‐aligned current (FAC). It is enhanced during magnetic reconnection and explosive energy release at a substorm. In this paper, we studied FAC, interplanetary electric field component (Ey), interplanetary magnetic field component (Bz), and northward (x) and eastward (y) components of geomagnetic field during three events of supersubstorm occurred on 24 November 2001, 21 January 2005, and 24 August 2005. Large‐scale FAC, supposed to be produced during supersubstorm (SSS), has potentiality to cause blackout on Earth. We examined temporal variations of the x and y components of high‐latitude geomagnetic field during SSS, which is attributed to the FACs. We shall report the characteristics of high‐latitude northward and eastward components of geomagnetic field variation during the growth phase of SSS by the implementation of discrete wavelet transform (DWT) and cross‐correlation analysis. Among three examples of SSS events, the highest peak value of FAC was estimated to be ~19 μAm−2. This is shore up with the prediction made by Parks (1991) and Stasiewicz et al. (1998) that the FACs may vary from a few tens to several hundred μAm−2. Although this peak value of FACs for SSS event is much higher than the average FACs associated with regular substorms or magnetic storms, it is expedient and can be expect for SSS events which might be due to very high density solar wind plasma parcels (PPs) triggering the SSS events. In all events, during growth phase, the FAC increases to extremely high level and the geomagnetic northward component decreases to extremely low level. This represents a strong positive correlation between FAC and geomagnetic northward component. The DWT analysis accounts that the highest amplitude of the wavelet coefficients indicates singularities present in FAC during SSS event. But the amplitude of squared wavelet coefficient is found to be different from each other, which might be due to the solar wind PPs of different density triggering the SSS events. The cross‐correlation analysis suggests that the perturbation on geomagnetic northward component at high latitude during SSS strongly correlates with the fluctuation pattern of FAC density. Hence, the FAC is the primary sources for the eastward‐westward magnetic field perturbations at high latitude.

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Section: Resultsmentioning

confidence: 99%

Study of field‐aligned current (FAC), interplanetary electric field component (E_y), interplanetary magnetic field component (B_z), and northward (x) and eastward (y) components of geomagnetic field during supersubstorm

Adhikari¹,

Dahal

Chapagain

2017

Earth and Space Science

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“…Geomagnetic storms are caused mainly by solar wind transients from the coronal mass ejections (CMEs) and solar flares or by the corotating interaction regions (CIRs) formed during the interaction between the high and low speed streams (Rawat et al, 2009). Occurrence frequency and intensity of transient solar emissions vary with different phases of the solar cycle characterized by the number of sunspots on the photosphere.…”

Section: Introductionmentioning

confidence: 99%

Some ionospheric storm effects at equatorial and low latitudes

Mansilla¹

2014

Advances in Space Research

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“…O'Brien and McPherron () and Wang et al () then found that the RC decay time varies exponentially with E SW but with different function forms under southward and northward IMF conditions, respectively. Rawat et al () further indicated that the relationship between the E SW and the declination of the geomagnetic field can be described by a second‐order polynomial when E SW is duskward. Clauer et al () showed that about 45% of the dawn‐dusk asymmetries in low‐latitude geomagnetic disturbances can be predicted with E SW .…”

Section: Introductionmentioning

confidence: 99%

The Magnetic Local Time Distribution of Storm Geomagnetic Field Disturbance Under Different Conditions of Solar Wind and Interplanetary Magnetic Field

Liu

Zhang

et al. 2019

JGR Space Physics

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The magnetic local time (MLT) distributions of the horizontal geomagnetic disturbance (ΔH)are investigated with the SuperMAG data set during 330 magnetic storms from 2000 to 2015. Then the MLT distributions of ΔH are verified and interpreted with the SuperMAG-based partial ring current indices (SMR indices) and the Burton equation. It is shown that the ΔH is positive at most MLTs and slightly stronger on the dayside during the initial phase. Such distribution might be mainly attributed to the global positive impact of the magnetopause currents, while the ring current (RC) only produces weak negative disturbances, which are slightly stronger on the duskside. In the main phase, the ΔH decreases prominently with the peak on the duskside. The RC particles injection plays a major role, especially for large solar wind electric field (E SW ) . The region with ΔH larger than −20 nT is concentrated on the dawnside for small E SW , which might be attributed to earthward bursty bulk flows. Besides, larger solar wind dynamic pressure might cause stronger disturbances under the same magnitude of E SW . In the recovery phase, the ΔH is weaker and more uniform distributed than in the main phase for negative E SW . For positive E SW , similar dawn-dusk asymmetry occurs as that in the main phase, but the peak of strongest disturbance tends to weaken and move toward the dayside. Based on the dawn-dusk asymmetric decay rate derived from the Burton equation, it is speculated that the contribution of partial RC might be no less than the FACs.

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Low-latitude geomagnetic response to the interplanetary conditions during very intense magnetic storms

Cited by 6 publications

References 46 publications

Study of field‐aligned current (FAC), interplanetary electric field component (E_y), interplanetary magnetic field component (B_z), and northward (x) and eastward (y) components of geomagnetic field during supersubstorm

Study of field‐aligned current (FAC), interplanetary electric field component (E_y), interplanetary magnetic field component (B_z), and northward (x) and eastward (y) components of geomagnetic field during supersubstorm

Some ionospheric storm effects at equatorial and low latitudes

The Magnetic Local Time Distribution of Storm Geomagnetic Field Disturbance Under Different Conditions of Solar Wind and Interplanetary Magnetic Field

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Low-latitude geomagnetic response to the interplanetary conditions during very intense magnetic storms

Cited by 6 publications

References 46 publications

Study of field‐aligned current (FAC), interplanetary electric field component (Ey), interplanetary magnetic field component (Bz), and northward (x) and eastward (y) components of geomagnetic field during supersubstorm

Study of field‐aligned current (FAC), interplanetary electric field component (Ey), interplanetary magnetic field component (Bz), and northward (x) and eastward (y) components of geomagnetic field during supersubstorm

Some ionospheric storm effects at equatorial and low latitudes

The Magnetic Local Time Distribution of Storm Geomagnetic Field Disturbance Under Different Conditions of Solar Wind and Interplanetary Magnetic Field

Contact Info

Product

Resources

About

Study of field‐aligned current (FAC), interplanetary electric field component (E_y), interplanetary magnetic field component (B_z), and northward (x) and eastward (y) components of geomagnetic field during supersubstorm

Study of field‐aligned current (FAC), interplanetary electric field component (E_y), interplanetary magnetic field component (B_z), and northward (x) and eastward (y) components of geomagnetic field during supersubstorm