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Measurements of coronal mass ejections (CMEs) by multiple spacecraft at smallradial separations but larger longitudinal separations is one of the ways tolearn about the three-dimensional structure of CMEs. Here, we take advantage ofthe orbit of the Wind spacecraft that ventured to distances of up to 0.012astronomical units (au) from the Sun-Earth line during the years 2000 to 2002.Combined with measurements from ACE, which is in a tight halo orbit around L1,the multipoint measurements allow us to investigate how the magnetic fieldinside magnetic ejecta (MEs) changes on scales of 0.005 - 0.012 au. We identify21 CMEs measured by these two spacecraft for longitudinal separations of 0.007au or more. We find that the time-shifted correlation between 30-minuteaverages of the non-radial magnetic field components measured at the twospacecraft is systematically above 0.97 when the separation is 0.008 au orless, but is on average 0.89 for greater separations. Overall, these newlyanalyzed measurements, combined with 14 additional ones when the spacecraftseparation is smaller, point towards a scale length of longitudinal magneticcoherence inside MEs of 0.25 - 0.35 au for the magnitude of the magnetic fieldbut 0.06 - 0.12 au for the magnetic field components. This finding raisesquestions about the very nature of MEs. It also highlights the need foradditional "mesoscale" multi-point measurements of CMEs with longitudinalseparations of 0.01 - 0.2 au.

On the Spatial Coherence of Magnetic Ejecta: Measurements of Coronal Mass Ejections by Multiple Spacecraft Longitudinally Separated by 0.01 AU