Abstract Details


Name: soumya Roy
Affiliation: IUCAA
Conference ID: TVS202510255
Title: White-Light Continuum Across the Balmer Jump: Coordinated SUIT, HEL1OS, IRIS, and AIA Observations of the 2024 October 3 Flare
Authors and Co-Authors: Durgesh Tripathi, Sreejith Padinhatteri, A N Ramaprakash, Janmejoy Sarkar, Nived V N , Rahul Gopalakrishnan
Abstract Type: Contributory Presentation
Abstract: Solar flares are the most energetic manifestations of solar activity, showing continuum enhancements in the visible and near-ultraviolet (NUV). The origin of the white light (WL) continuum remains debated, with two possible mechanisms: chromospheric hydrogen recombination producing a Balmer jump (Type I) or deep photospheric heating yielding a blackbody-like continuum without a Balmer jump (Type II). On 2024 October 3, a WLF was observed by multiple instruments, providing an unprecedented opportunity to study continuum emission across the Balmer jump. We combine near-simultaneous observations from the Aditya-L1 Solar Ultraviolet Imaging Telescope (SUIT), the High-Energy L1 Orbiting X-ray Spectrometer (HEL1OS), the Interface Region Imaging Spectrograph (IRIS), and the SDO Atmospheric Imaging Assembly (AIA). SUIT provides full-disk NUV imaging of flare ribbons and the continuum, while IRIS spectra and slit-jaw images resolve chromospheric and continuum contributions and the ribbon dynamics. AIA UV and EUV channels trace upper-chromospheric and transition-region response, and HEL1OS hard X-ray spectra constrain the nonthermal electron population. By correlating HXR bursts with NUV and white-light enhancements, we assess the role of accelerated electrons in driving continuum emission. This event represents the first coordinated SUIT–HEL1OS study of a white-light flare and highlights the synergy of Aditya-L1 with IRIS and AIA. These observations provide critical constraints on flare energy transport, offering new insights into the longstanding problem of how flare energy penetrates to the deepest observable solar layers.