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• W3087343285 abstract "&lt;p&gt;We present an analysis of the internal structure of a coronal mass ejection (CME)&amp;#160;detected by in situ&lt;span&gt;&amp;#160;&lt;/span&gt;instruments onboard the Parker Solar Probe (PSP) spacecraft during its first solar&amp;#160;encounter. On 2018 November 11 at 23:53 UT, the FIELDS magnetometer measured an increase&amp;#160;in strength of the magnetic field as well as a coherent change in the field direction. The SWEAP&amp;#160;instrument simultaneously detected the low proton temperature and signatures of bi-directionality in&amp;#160;the electron pitch angle distribution (PAD). These signatures are indicative of a CME embedded in the&amp;#160;slow solar wind. In conjunction with PSP was the STEREO A spacecraft, which enabled the remote&amp;#160;observation of a streamer blow-out by the SECCHI suite of instruments. The source at the Sun of&amp;#160;the slow and well-structured&lt;span&gt;&amp;#160;fl&lt;/span&gt;ux-rope was identified in an overlying streamer.&lt;/p&gt;&lt;p&gt;Our detailed inspection of the internal transient structure magnetic properties suggests high complexity&amp;#160;in deviations from an ideal&lt;span&gt;&amp;#160;&lt;/span&gt;flux rope 3D topology. Reconstructions of the magnetic field&amp;#160;conguration reveal a highly distorted structure consistent with the highly elongated `bubble' observed&amp;#160;remotely. A double-ring substructure observed in the SECCHI-COR2 eld of view (FOV) is&amp;#160;suggestive of a double internal&lt;span&gt;&amp;#160;&lt;/span&gt;flux rope. Furthermore, we describe a scenario in which mixed topology&amp;#160;of a closed&lt;span&gt;&amp;#160;&lt;/span&gt;flux rope is combined with the magnetically open structure, which helps explain the&lt;span&gt;&amp;#160;&lt;/span&gt;flux&amp;#160;dropout observed in the measurements of the electron PAD. Our justication for this is the plethora&amp;#160;of structures observed by the EUV imager (SECCHI-EUVI) in the hours preceding the streamer blowout&amp;#160;evacuation. Finally, taking advantage of the unique observations from PSP, we explore the first&amp;#160;stages of the effects of coupling with the solar wind and the evolutionary processes in the magnetic&amp;#160;structure. We found evidence of bifurcated current sheets in the structure boundaries suggestive of&amp;#160;magnetic reconnection. Our analysis of the internal force imbalance indicates that internal Lorentz&amp;#160;forces continue to dominate the evolution of the structure in the COR2 FOV and serves as the main&amp;#160;driver of the internal&lt;span&gt;&amp;#160;fl&lt;/span&gt;ux rope distortion as detected in situ at PSP solar distance.&lt;/p&gt;" @default.
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• W3087343285 date "2020-03-23" @default.
• W3087343285 modified "2023-10-16" @default.
• W3087343285 title "Analysis of the Internal structure of the Streamer Blow Out Observed by the Parker Solar Probe during the First Solar Encounter" @default.
• W3087343285 doi "https://doi.org/10.5194/egusphere-egu2020-22182" @default.
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