In situ observation during May 10-11, 2024, using (a) MAG and SWE instruments on board Wind and (b) MAG, SWEA, and PLASTIC instruments on board the STA spacecraft. The dotted lines in the ϕ panel indicate the nominal sector boundaries of the interplanetary magnetic field derived using a Parker spiral angle obtained from the local solar wind observations at Wind and STA. Here, ϕ values between (outside) the lines indicate the magnetic field in the away (toward) sector of the heliosphere. The blue shaded regions of W1, W2, and S1 present the localized helicity regions in both the time and frequency domains (see Section 3.2 for details). The hatched intervals indicate an unperturbed core of ejecta, as discussed in Section 3.3. The eighth (seventh) column in panel a (b) shows the energy flux (phase space density) of suprathermal electrons in the 265 (247) eV energy bin.