Mariana Cécere
Impact of Helmet Streamers on the Eruption Dynamics of Magnetic Flux Ropes
Solar eruptions are critical for space weather predictions, and understanding the mechanisms behind these events is key to assessing their geoeffectiveness. Helmet streamers (HSs), present in both solar minimum and maximum activity periods, play a significant role in the eruption process. These structures include a low-energy current sheet where coronal mass ejections (CMEs) tend to deflect, and a closed magnetic field region that often confines eruptions. This study investigates how the presence of HSs influences the eruptiveness of magnetic flux ropes (MFRs) using 2.5D MHD simulations. Our findings highlight that null point reconnection is crucial for determining whether an MFR will erupt, depending on the initial magnetic configuration. We identify a critical ratio of magnetic fluxes that determines the success of the eruption. When the strapping flux above the MFR is less than two-thirds of its own poloidal flux, an eruption is more likely. This work establishes key parameters for predicting CME behavior based on MFR and HS configurations.
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Impact of Helmet Streamers on the Eruption Dynamics of Magnetic Flux Ropes