Solar wind and geomagnetism: toward a standard classification of geomagnetic activity from 1868 to 2009

Abstract

Abstract. We examined solar activity with a large series of geomagnetic data from 1868 to 2009. We have revisited the geomagnetic activity classification scheme of Legrand and Simon (1989) and improve their scheme by lowering the minimum Aa index value for shock and recurrent activity from 40 to 20 nT. This improved scheme allows us to clearly classify about 80 % of the geomagnetic activity in this time period instead of only 60 % for the previous Legrand and Simon classification.

Solar Activity and Meteorological Fluctuations in West Africa: Temperatures and Pluviometry in Burkina Faso, 1970-2012

“…Placing now our study in the context of solar cycle phases (Minimum, Increasing, Maximum, and Decreasing) and geomagnetic classification proposed by Zerbo et al [7], we made interesting analysis: 1) During Minimum phase where Quiet activity (QA) is predominant [6][7][8], precipitations increase (Figure 1) and temperatures decreases (Figure 2). This phase is characterized by slow solar wind speed and high density of solar plasma 2) During Maximum phase where Shock Activity (SA) is predominant [6][7][8], precipitations increase (Figure 1) and temperatures fluctuates (Figure 2). Here Coronal mass ejections (CMEs) are the most important solar events with important energy dissipated in interplanetary medium modifying atmospheric circulation and chemistry (overpressure or depression).…”

“…These periods are characterized by high stream solar wind speed flowing from coronal holes [6][7][8] most disturbed magnetic field with important solar dynamo and joule effect. All that implies that there is no zero climate response to the non constant energy receive from sun (G. Tsiropoula [13]).…”

“…This heat radiation from the Sun is believed to be the primary factor of Earth climate conditions. Several studies have been made over the last decade on geomagnetic activities and weather variations (Delouis and Mayaud [1], Courtillot and Le Mouel [2]; Legrand and Simon [3], Simon and Legrand [4], Gonzalez et al [5], Ouattara et al [6], Zerbo et al [7,8]) and local magnetic observations (Patel. [9], Courtillot and Le Mouel [10]).…”

United Nations Basic Space Science Initiative (UNBSSI) 1991-2012 and Beyond

“…Indonesia (10) MAGDAS (8), SID (2) 48. Ireland (14) AWESOME (1), CALLISTO(4), SID (9) 49. Israel (4) AWESOME (1), ULF_ELF_VLF(3) 50.…”

Solar wind fluctuations and solar activity long-term swing: 1963-2012

“…Since it is well known that the CMEs occur in majority on the maximum phase of the solar cycle and the high stream solar wind following from coronal holes occur during the declining of solar cycle, we choose in this paper to investigate the natural links between solar wind parameters (B, V) and the Polar Cap Index (PCI) introduced by Troshichev et al, 1988, and used in a statistical sense as a measure of electric field. Our interest is to learn more about the link between the solar dynamo and the energy dissipated in interplanetary medium in the context of geomagnetic activity (Legrand and Simon, 1989;Zerbo et al, 2012).…”