Observations more than 2 hr apart do not constitute conjunction between the spacecraft and the rockets. These overlapping injections are also evidence of multiple reconnections at the magnetopause. Approximately 2 hr after this crossing, the Twin Rocket Investigation of Cusp Electrodynamics‐2 rockets were launched into the northern hemisphere cusp and observed overlapping cusp ion injections. This crossing occurred when the Interplanetary Magnetic Field (IMF) was southward and had a significant BY component. Magnetospheric Multiscale (MMS) observations during an extended crossing of the Earth's dayside magnetopause show evidence of multiple reconnections at the boundary. Recently, direct multi-point observations of the reconnection process within the ion and electron diffusion regions (EDRs) have been made by the Magnetospheric Multiscale (MMS) mission Webster et al., 2018). Indirect observations are varied, and include the inward (earthward) motion of the magnetopause in response to an extended interval of southward interplanetary magnetic field (IMF) (Aubry et al., 1970), in situ observations of accelerated ion flows tangent to the magnetopause and within the boundary layers (e.g., Gosling et al., 1982Gosling et al.,, 1986Gosling et al., 1990aGosling et al.,, 1990bLavraud et al., 2005 Paschmann et al., 1989 Petrinec et al., 2016 Phan et al., 2000 Scurry et al., 1994 Sonnerup et al., 1981 Trattner et al., 2012 Trenchi et al., 2008 Vines et al., 2015), observations of cusp ion energy dispersions (e.g., Escoubet et al., 1992 Newell & Meng, 1991 Reiff et al., 1977 Rosenbauer et al., 1975 Shelley et al., 1976 Trattner et al., 1999), and imaging of cusp ionosphere emissions due to particle precipitation from the magnetopause (e.g., Bobra et al., 2004 Frey et al., 2002Frey et al.,, 2003Fuselier et al., 2002 Phan et al., 2003). Over the past several decades, there have been many direct and indirect observations of magnetic reconnection at the terrestrial magnetopause by sampling spacecraft.
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