Nancy Narang

• Narang, Nancy; Chandrashekhar, Kalugodu; Jafarzadeh, Shahin; Fleck, Bernhard; Szydlarski, Mikolaj & Wedemeyer, Sven (2022). Power distribution of oscillations in the atmosphere of a plage region: Joint observations with ALMA, IRIS, and SDO. Astronomy and Astrophysics (A & A). ISSN 0004-6361. 661. doi: 10.1051/0004-6361/202142080. Fulltekst i vitenarkiv

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• Narang, Nancy (2021). Power distribution of oscillations in plage region: Joint observations from ALMA, IRIS and AIA.
• Narang, Nancy (2021). Power distribution of oscillations in plage region: Joint observations from ALMA, IRIS and AIA.
• Narang, Nancy (2020). What causes high-frequency oscillations in active region moss: Waves or/and Reconnection? Vis sammendrag

  The high temporal, spatial and spectral resolution of Interface Region Imaging Spectrograph (IRIS) has provided new insights into the understanding of different small-scale processes occurring at the chromospheric and transition region heights. I will present a study of the dynamics of high-frequency oscillations of an active region (AR 2376) moss as recorded by simultaneous imaging and spectral data of IRIS. Wavelet transformations and power maps from slit-jaw images in Si IV 1400 Å passband, and sit-and-stare spectroscopic observations of Si IV 1403 Å spectral line reveal the presence of high-frequency oscillations with ~1-2 minutes periods in the bright moss regions. The presence of such low periodicities is further confirmed by intrinsic mode functions (IMFs) as obtained by empirical mode decomposition (EMD) technique. I will show the evidence of the presence of slow waves and reconnection-like events, and that together they cause the high-frequency oscillations in the bright moss regions.

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