Geomagnetic field variation during winter storm at localized southern and northern high latitude

Devi, Babita; Dubey, Shubha; Saini, Shailendra; Devi, Rajni; Wahi, Rashmi; Dhar, Ajay; Vijay, S. K.; Gwal, A. K.

doi:10.1007/s12036-008-0036-8

Cited by 4 publications

(3 citation statements)

References 6 publications

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“…In comparison between northern hemisphere observatories Tamanrasset (TAM) and Honolulu (HON) and southern hemisphere observatories Charters Towers (CTA) and Vassouras (VSS), more depressed fluctuations in H component observed at southern hemisphere observatories [ Adhikari , ]. This shows that in the southern hemisphere the geomagnetic field variations are larger than in the northern hemisphere [ Devi et al , ]. Although the physical mechanism is related to the intermittent magnetic reconnection between IMF‐ B z and geomagnetic field [ Gonzalez et al , ; Bhattarai et al , ], specific characteristics with the morphology of the magnetosphere‐ionosphere system must be considered.…”

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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“…The interaction between the IMF, solar wind and the GF occurs mainly in a region called the magnetosphere. The geomagnetic disturbances resulting from this interaction are generally limited to the high-latitude regions unless the vertical component of IMF (Bz) is lastly persistent (several hours or more) in its southward orientation and with considerable magnitudes [Devi et al, 2008].…”

Section: Introductionmentioning

confidence: 99%

Daily geomagnetic variations under variable IMF/solar conditions and their connection with underground conductivity changes in Japan

Takla,

Yoshikawa,

Uozumi

et al. 2024

Annals of Geophysics

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Fluctuations in Solar Wind (SW) and Interplanetary Magnetic Field (IMF) significantly affect the Geomagnetic Field (GF) measurements particularly during extreme space weather events. The current study investigates the variations of horizontal (H), vertical (Z) geomagnetic components under quiet and disturbed IMF and solar conditions as well as the effect of underground conductivity on the stationary geomagnetic measurements in Japan. Results of data analysis show that the response of the GF to IMF and solar parameters fluctuations is variable. The H- and Z-components were in good harmony with high visual correlation along a latitudinal profile across Japan during quiet times. On the other hand, during the disturbed times related to a Coronal Mass Ejection (CME) launched on 13 May 2005, the GF components varied with the disturbance of IMF and solar parameters. The H-components showed highly correlated variations with a significant reduction along the examined profile due to intensified ionospheric currents, while the Z-components recorded in the northern part of Japan showed abnormal daily variations pattern (positive daily variations) with an enhanced amplitude which is opposite to the normal behavior of daily variations recorded in the central and southern parts of Japan (negative daily variations). The observed enhanced and abnormal daily variation of Z-components in north Japan, which we consider a remarkable observation here, is possibly linked with underground conductivity anomaly in this region.

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“…It is observed that geomagnetic field components vary with interplanetary magnetic field when the later is oriented in southward direction [20]. They observed that the variations are larger at southern hemisphere compared to the northern hemisphere.…”

Section: Introductionmentioning

confidence: 99%

Variability of Geomagnetic Field with Interplanetary Magnetic Field at Low, Mid and High Latitudes

et al. 2018

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The fluctuations in the Interplanetary Magnetic Field significantly affect the state of geomagnetic field particularly during the Coronal Mass Ejection (CME) events. In the present investigation we have studied the influence of Interplanetary Magnetic Field changes on the geomagnetic field components at high, low and mid latitudes. To carry out this investigation we have selected three stations viz. Alibag (18.6°N, 72.7°E), Beijing MT (40.3°N, 116.2°E) and Casey (66.2°S, 110.5°E) one each in the low, mid and high latitude regions. Then we selected geomagnetic storm events of three types namely weak (-50≤Dst≤-20), moderate (100≤Dst≤-50) and intense (Dst≤-100nT). In each storm category 10 events were considered. From our study we conclude that geomagnetic field components are significantly affected by the changes in the IMF at all the three latitudinal regions during all the storm events. At the same time we also found that the magnitude of change in geomagnetic field components is highest at the high latitudes during all types of storm events while at low and mid latitude stations the magnitude of effect is approximately the same.

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Geomagnetic field variation during winter storm at localized southern and northern high latitude

Cited by 4 publications

References 6 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

Daily geomagnetic variations under variable IMF/solar conditions and their connection with underground conductivity changes in Japan

Variability of Geomagnetic Field with Interplanetary Magnetic Field at Low, Mid and High Latitudes

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Geomagnetic field variation during winter storm at localized southern and northern high latitude

Cited by 4 publications

References 6 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

Daily geomagnetic variations under variable IMF/solar conditions and their connection with underground conductivity changes in Japan

Variability of Geomagnetic Field with Interplanetary Magnetic Field at Low, Mid and High Latitudes

Contact Info

Product

Resources

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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