The 2015 Summer Solstice Storm: One of the Major Geomagnetic Storms of Solar Cycle 24 Observed at Ground Level

Autor(es):Mostrar menos -

Augusto, C. R. A. ^[1] ; Navia, C. E. ^[1] ; de Oliveira, M. N. ^[1] ; Nepomuceno, A. A. ^[2] ; Raulin, J. P. ^[3] ; Tueros, E. ^[3] ; de Mendonca, R. R. S. ^{[4, 5]} ; Fauth, A. C. ^[6] ; Vieira de Souza, H. ^[6] ; Kopenkin, V. ^[7] ; Sinzi, T. ^[8]

Afiliação do(s) autor(es)

^[1] Univ Fed Fluminense, Inst Fis, BR-24210346 Niteroi, RJ - Brazil

^[2] Univ Fed Fluminense, Dept Cincias Nat, BR-28890000 Rio Das Ostras, RJ - Brazil

^[3] Univ Presbiteriana Mackenzie, CRAAM, BR-01302907 Sao Paulo, SP - Brazil

^[4] Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, 1 Nanertiao, Beijing 100190 - Peoples R China

^[5] Natl Inst Space Res INPE, Space Geophys Div, BR-12227010 Sao Jose Dos Campos, SP - Brazil

^[6] Univ Estadual Campinas, Inst Fis Gleb Wathagin, BR-13083859 Campinas, SP - Brazil

^[7] Waseda Univ, Res Inst Sci & Engn, Shinjuku Ku, Tokyo 169 - Japan

^[8] Rikkyo Univ, Toshima Ku, Tokyo 171 - Japan

• Tipo de documento: Artigo Científico
• Fonte: SOLAR PHYSICS; v. 293, n. 5 MAY 2018.
• Citações Web of Science: 2

Resumo

We report on the 22 - 23 June 2015 geomagnetic storm that occurred at the summer solstice. There have been fewer intense geomagnetic storms during the current solar cycle, Solar Cycle 24, than in the previous cycle. This situation changed after mid-June 2015, when one of the largest solar active regions (AR 12371) of Solar Cycle 24 that was located close to the central meridian, produced several coronal mass ejections (CMEs) associated with M-class flares. The impact of these CMEs on the Earth's magnetosphere resulted in a moderate to severe G4-class geomagnetic storm on 22 - 23 June 2015 and a G2 (moderate) geomagnetic storm on 24 June. The G4 solstice storm was the second largest (so far) geomagnetic storm of Cycle 24. We highlight the ground-level observations made with the New-Tupi, Muonca, and the CARPET El Leoncito cosmic-ray detectors that are located within the South Atlantic Anomaly (SAA) region. These observations are studied in correlation with data obtained by space-borne detectors (ACE, GOES, SDO, and SOHO) and other ground-based experiments. The CME designations are taken from the Computer Aided CME Tracking (CACTus) automated catalog. As expected, Forbush decreases (FD) associated with the passing CMEs were recorded by these detectors. We note a peculiar feature linked to a severe geomagnetic storm event. The 21 June 2015 CME 0091 (CACTus CME catalog number) was likely associated with the 22 June summer solstice FD event. The angular width of CME 0091 was very narrow and measured degrees seen from Earth. In most cases, only CME halos and partial halos lead to severe geomagnetic storms. We perform a cross-check analysis of the FD events detected during the rise phase of Solar Cycle 24, the geomagnetic parameters, and the CACTus CME catalog. Our study suggests that narrow angular-width CMEs that erupt in a westward direction from the Sun-Earth line can lead to moderate and severe geomagnetic storms. We also report on the strong solar proton radiation storm that began on 21 June. We did not find a signal from this SEP at ground level. The details of these observations are presented. (AU)

• Processo FAPESP: 11/24117-9 - Processos de alta energia no sol, meio interplanetário e seus efeitos na atmosfera terrestre
• Beneficiário: Jean Pierre Raulin
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 11/50193-4 - Detecção e estudo de eventos solares transientes e variação climática
• Beneficiário: Anderson Campos Fauth
• Modalidade de apoio: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Regular