Physical reasons for regular discrepancies in values of the PCN and PCS indices characterizing magnetic activity in the northern and southern polar caps

Troshichev, O. A.; Stepanov, N.A.; Sormakov, D. A.

doi:10.1016/j.jastp.2023.106096

Cited by 3 publications

(13 citation statements)

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“…The main objective of this study is to provide further statistical evidence for the similarity/difference between concurrent PCN and PCS indices in relation to the IMF orientation and the ionospheric conductivities induced by the solar illumination over the PC index stations (Lockwood, 2023a(Lockwood, , 2023bO. A. Troshichev, 2022;O. A. Troshichev et al, 2023).…”

Section: Resultsmentioning

confidence: 99%

“…Examination of these concurrent PC indices for various seasons and MLT locations of the PC index stations also enables to extend the analyses in previous studies (e.g., Lockwood, 2023aLockwood, , 2023bO. A. Troshichev, 2022;O. A. Troshichev et al, 2023) in the context of the hemispheric difference in the ionospheric conductance produced by solar illumination as well as that in the global-scale current/convection patterns in high-latitude ionospheres.…”

Section: Introductionmentioning

confidence: 83%

“…More recently, several studies have been conducted to statistically investigate the physical reasons that cause not only the occurrence of positive/negative values in PCN and PCS indices but also the difference in these indices (Lockwood, 2023a(Lockwood, , 2023bO. A. Troshichev, 2022;O. A. Troshichev et al, 2023).…”

Section: Introductionmentioning

confidence: 99%

“…In this regard, the distortion of the E KL -induced ionospheric current/convection system (Lockwood, 2023a(Lockwood, , 2023bO. A. Troshichev, 2022;O. A. Troshichev et al, 2023).…”

Section: Introductionmentioning

confidence: 99%

“…Besides, the differences in the ionospheric conductance between the northern and southern polar caps can be a possible candidate because of their effects on the hemispheric differences in the ionospheric current system (Lockwood, 2023a(Lockwood, , 2023bLukianova et al, 2002;O. A. Troshichev, 2022;O. A. Troshichev et al, 2023).…”

Section: Introductionmentioning

confidence: 99%

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Statistical Features of Polar Cap North and South Indices in Response to Interplanetary and Terrestrial Conditions: A Revisit

Park,

Shi,

Troshichev

et al. 2024

Space Weather

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In this study, we investigate statistical features of polar cap north (PCN) and south (PCS) indices in response to various interplanetary conditions (interplanetary magnetic field [IMF] orientation in three‐dimensions) and terrestrial conditions (seasonal and magnetic local time [MLT] locations of the index stations). The concurrent PCN‐PCS pairs for 1998–2002 and 2004–2018 are divided based on their sign type (positive‐positive, negative‐negative, negative‐positive, and positive‐negative PCN‐PCS pairs) and time coverage (the times when both index stations are in the dawn/dusk MLT sector during northern summer/winter). Analyzing the IMF orientation dependence on the occurrence probabilities of concurrent indices and on the differences between the indices in various sign types for each time coverage reveals that the statistical features in PCN‐PCS pairs obtained in the dawn MLT sector can be largely explained by the effects of the three‐component IMF (related to the polar cap convection patterns) combined with season (related to the hemispheric asymmetry in solar illumination‐induced ionospheric conductance). However, those obtained in the dusk MLT sector are controlled dominantly by seasonal effects rather than IMF orientation effects. Our findings indicate that PCN‐PCS pair data provide local views about the solar wind‐magnetosphere‐ionosphere (SW‐M‐I) coupling system with different control efficiencies of IMF orientation and season depending on the MLT location of the stations. Therefore, introducing polar cap indices recorded simultaneously at various locations in both hemispheres and analyzing them are strongly required to infer global views of the coupled SW‐M‐I system in the open field regions with higher confidence.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

“…In this regard, the distortion of the E KL -induced ionospheric current/convection system (Lockwood, 2023a(Lockwood, , 2023bO. A. Troshichev, 2022;O. A. Troshichev et al, 2023).…”

Section: Introductionmentioning

confidence: 99%