Nancy Narang

Postdoctoral Fellow - Rosseland Centre for Solar Physics

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Email nancy.narang@astro.uio.no

Phone +47 96673537

Room 210

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Visiting address Institutt for Teoretisk Astrofysikk Sem Sælands vei 13 Svein Rosselands hus 0371 OSLO

Postal address Postboks 1029 0315 OSLO

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https://orcid.org/0000-0001-9398-2063

Solar Atmospheric Heating, Observations and Simulations, Plasma Physics, Magnetohydrodynamics, Radiative Transfer

Ph.D. in Astrophysics (Indian Institute of Astrophysics)

Thesis Title: Study of Small-Scale Features Observed in Solar Atmosphere

High-frequency dynamics of an active region moss as observed by IRIS

N. Narang, V. Pant, D. Banerjee, T. V. Doorsselaere, 2019, Frontiers in Astronomy and Space Sciences, 6:36 [https://dx.doi.org/10.3389/fspas.2019.00036]
Association of calcium network bright-points with underneath photospheric magnetic patches

N. Narang, D. Banerjee, K. Chandrashekhar, V. Pant, 2019, Solar Physics, 294:40 [https://dx.doi.org/10.1007/s11207-019-1419-5]
Statistical study of network jets observed in the solar transition region: A comparison between coronal holes and quiet sun regions

N. Narang , R. T. Arbacher, H. Tian, D. Banerjee, S. R. Cranmer, E. E. DeLuca, S. McKillop, 2016, Solar Physics, 291: 129 [ https://dx.doi.org/10.1007/s11207-016- 0886-1 ]

Narang, Nancy (2020). What causes high-frequency oscillations in active region moss: Waves or/and Reconnection?. Show summary
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.

Published Jan. 6, 2020 3:18 PM - Last modified July 2, 2020 2:46 PM