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These modes carry a wealth of information about red giant cores, but are of limited use when constraining rapid structural variations in their envelopes. This limitation can be circumvented if we have access to the frequencies of the pure acoustic dipolar modes in red giants, i.e. the dipole modes that would exist in the absence of coupling between gravity and acoustic waves. We present a pilot study aimed at evaluating the implications of using these pure acoustic mode frequencies in seismic studies of the helium structural variation in red giants. The study is based on artificial seismic data for a red giant branch stellar model, bracketing seven acoustic dipole radial orders around \u03bdmax. The pure acoustic dipole-mode frequencies are derived from a fit to the mixed-mode period spacings and then used to compute the pure acoustic dipole-mode second differences. The pure acoustic dipole-mode second differences inferred through this procedure follow the same oscillatory function as the radial-mode second differences. The additional constraints brought by the dipolar modes allow us to adopt a more complete description of the glitch signature when performing the fit to the second differences. The amplitude of the glitch retrieved from this fit is 15${{\\ \\rm per\\ cent}}$ smaller than that from the fit based on the radial modes alone. Also, we find that thanks to the additional constraints, a bias in the inferred glitch location, found when adopting the simpler description of the glitch, is avoided.<\/jats:p>","DOI":"10.1093\/mnras\/staa1981","type":"journal-article","created":{"date-parts":[[2020,7,7]],"date-time":"2020-07-07T19:10:21Z","timestamp":1594149021000},"page":"1008-1014","source":"Crossref","is-referenced-by-count":13,"title":["On using dipolar modes to constrain the helium glitch in red giant stars"],"prefix":"10.1093","volume":"497","author":[{"given":"G","family":"Dr\u00e9au","sequence":"first","affiliation":[{"name":"Magist\u00e8re de Physique Fondamentale, Universit\u00e9 Paris-Saclay, B\u00e2t. 625, F-91405 Orsay CEDEX, France"},{"name":"LESIA, Observatoire de Paris, PSL Research University, CNRS, Universit\u00e9 Pierre et Marie Curie, Universit\u00e9 Paris Diderot, F-92195 Meudon, France"}]},{"given":"M S","family":"Cunha","sequence":"additional","affiliation":[{"name":"Instituto de 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