![]() ![]() King, J.H., Papitashvili, N.E.: 2005, Solar wind spatial scales in and comparisons of hourly Wind and ACE plasma and magnetic field data. Joshi, B., Bhattacharyya, R., Pandey, K.K., Kushwaha, U., Moon, Y.-J.: 2015, Evolutionary aspects and north-south asymmetry of soft X-ray flare index during solar cycles 21, 22, and 23. Janardhan, P., Fujiki, K., Ingale, M., Bisoi, S.K., Rout, D.: 2018, Solar cycle 24: an unusual polar field reversal. Gonçalves, E., Mendes-Lopes, N., Dorotovič, I., Fernandes, J.M., Garcia, A.: 2014, North and South hemispheric solar activity for cycles 21 – 23: asymmetry and conditional volatility of plage region areas. Gerontidou, M., Mavromichalaki, H., Daglis, T.: 2018, High-speed solar wind streams and geomagnetic storms during Solar Cycle 24. ![]() Georgieva, K., Kirov, B., Tonev, P., Guineva, V., Atanasov, D.: 2007, Long-term variations in the correlation between NAO and solar activity: the importance of north south solar activity asymmetry for atmospheric circulation. (ed.) 20th National Solar Physics Meeting 20, 58. ADS.ĭorotovič, I., Rybák, J., Garcia, A., Journoud, P.: 2010, North-south asymmetry of Ca ii K regions determined from OAUC spectroheliograms: 1996 – 2006. ADS.ĭavis, T.N., Sugiura, M.: 1966, Auroral electrojet activity index AE and its universal time variations. ADS.Ĭastillo, Y.S., Pais, M.A., Fernandes, J., Ribeiro, P., Morozova, A.L., Pinheiro, F.J.G.: 2017, Geomagnetic activity at Northern Hemisphere’s mid-latitude ground stations: how much can be explained using TS05 model. ADS.īuonsanto, M.J.: 1999, Ionospheric storms – a review. ADS.īeggan, C.D., Beamish, D., Richards, A., Kelly, G.S., Thomson, A.W.P.: 2013, Prediction of extreme geomagnetically induced currents in the UK high-voltage network. #Field angle omniweb software#ADS.īarata, T., Carvalho, S., Dorotovic, I., Pinheiro, F.J.G., Garcia, A., Fernandes, J., Lourenco, A.M.: 2018, Software tool for automatic detection of solar plages in the Coimbra Observatory spectroheliograms. #Field angle omniweb series#We further retrieve a clear annual oscillation in series of 27-day-mean values of toward/away asymmetries of geomagnetic-activity indices, which can be interpreted in the light of the Russell–McPherron hypothesis for the semiannual variation of geomagnetic activity.īallester, J.L., Oliver, R., Carbonell, M.: 2005, The periodic behaviour of the North-South asymmetry of sunspot areas revisited. Our results suggest that, among the parameters tested in this study, solar facular areas, interplanetary magnetic-field intensity and new proxies derived from the TS05 model could be taken into account in an empirical model, with a 27-day resolution, to explain geomagnetic activity felt on the Earth’s surface in terms of solar-surface features and the IMF condition. In this analysis, two new proxies were considered: i) \(B_\) GSM (Geocentric Solar Magnetic), calculated as the daily percentage of the IMF southward component along the GSM \(z\)-axis and then averaged every 27 days ii) four magnetospheric indices (T-indices), calculated from the local north–south ( \(x\)) contributions of the magnetosphere’s cross-tail (TAIL), the symmetric ring current (SRC), the partial ring current (PRC), and the Birkeland current (FAC), derived from the Tsyganenko and Sitnov ( J. Correlations between solar, interplanetary-medium parameters, and geomagnetic-activity proxies in 27-day averages (a Bartels rotation) were analyzed for the 2009 – 2016 time interval. ![]()
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