• Anita Mohan

      Articles written in Journal of Astrophysics and Astronomy

    • Density and temperature diagnostics of solar emission lines from NeV/MgV and SiVII/MgVII Ions

      Anita Mohan B. N. Dwivedi P. K. Raju

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      We present NeV/MgV and SiVII/MgVII theoretical line intensity ratios as a function of electron densityNe and temperatureTe. These are shown in the form of ratio-ratio diagrams, which should in principle allow bothNe andTe to be deduced for the emitting region of the solar plasma. We apply these diagnostics in the solar atmosphere, and discuss the available observations made from space. In most cases, however, we deduceNe andTe from the computed absolute line intensities in a spherically symmetric model atmosphere of the Sun. Possible future applications of this investigation to spectral data from the Coronal Diagnostic Spectrometer (CDS) on the Solar and Heliospheric Observatory (SOHO) are briefly discussed.

    • Electron density and temperature measurements, and abundance anomalies in the solar atmosphere

      Anita Mohan Bhola N. Dwivedi Enrico Landi

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      Using spectra obtained from the SUMER (Solar Ultraviolet Measurements of Emitted Radiation) spectrograph on the spacecraft SOHO (Solar and Heliospheric Observatory), we investigate the height dependence of electron density, temperature and abundance anomalies in the solar atmosphere. In particular, we present the behaviour of the solar FIP effect (the abundance enhancement of elements with first ionization potential < 10 eV in the corona with respect to photospheric values) with height above an active region observed at the solar limb, with emphasis on the so-called transition region lines.

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      Posted on January 27, 2016

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