@Article{DaiHWYGDLRG:2023:MaMaRe,
               author = "Dai, Lei and Han, Yimin and Wang, Chi and Yao, Shuo and Gonzalez 
                         Alarcon, Walter Dem{\'e}trio and Duan, Suping and Lavraud, Benoit 
                         and Ren, Yong and Guo, Zhenyuan",
          affiliation = "{Chinese Academy of Sciences} and {Chinese Academy of Sciences} 
                         and {Chinese Academy of Sciences} and {China University of 
                         Geosciences} and {Instituto Nacional de Pesquisas Espaciais 
                         (INPE)} and {Chinese Academy of Sciences} and {Universite 
                         Bordeaux} and {Chinese Academy of Sciences} and {Chinese Academy 
                         of Sciences}",
                title = "Geoeffectiveness of interplanetary Alfv{\'e}n waves. I. 
                         magnetopause magnetic reconnection and directly driven substorms",
              journal = "Astrophysical Journal",
                 year = "2023",
               volume = "945",
               number = "1",
                pages = "e47",
                month = "Mar.",
             abstract = "In particular during the descending phase of the solar cycle, 
                         Alfv{\'e}n waves in the high-speed solar wind streams are a major 
                         form of interplanetary disturbances. The fluctuating southward 
                         interplanetary magnetic field (IMF) of Alfv{\'e}n waves has been 
                         suggested to induce geomagnetic activities through intermittent 
                         magnetic reconnection at the magnetopause. In this study, we 
                         provide in situ observational evidence for dayside magnetopause 
                         reconnection induced by such interplanetary Alfv{\'e}n waves. 
                         Using multipoint conjunction observations, we show that the IMF B 
                         z from interplanetary Alfv{\'e}n waves is transmitted through and 
                         amplified by the Earths bow shock. Associated with the intensified 
                         southward B z to the magnetopause, in situ signatures of magnetic 
                         reconnection are detected. Repetitively, interplanetary 
                         Alfv{\'e}n waves transmit the intensified B z to the 
                         magnetosheath, leading to intervals of large magnetic shear angles 
                         across the magnetopause and magnetopause reconnection. Such 
                         intervals are promptly followed by hundreds of nanoTesla (nT) 
                         increases in the auroral electrojet indices (AE and AU) within 
                         10-20 minutes. These observations are confirmed in multiple events 
                         in corotating interaction region-driven geomagnetic storms. To put 
                         the observations into context, we propose a phenomenological model 
                         of a strongly driven substorm. The substorm electrojet is linked 
                         to the enhanced magnetopause reconnection in the short timescale 
                         of re-establishing the ionosphere electric field and the two-cell 
                         convection. These results provide insights on the temporal 
                         patterns of solar wind magnetosphere-ionosphere coupling, 
                         especially during the descending phase of the solar cycle.",
                  doi = "10.3847/1538-4357/acb267",
                  url = "http://dx.doi.org/10.3847/1538-4357/acb267",
                 issn = "0004-637X and 1538-4357",
             language = "en",
           targetfile = "Dai_2023_ApJ_945_47.pdf",
        urlaccessdate = "11 maio 2024"
}