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  • Helioseismic inversion to infer the depth profile of solar meridional flow using spherical born kernels 
    Mandal, K; Hanasoge, S. M; Rajaguru, S. P; Antia, H. M (IOP Publishing, 2018-08)
    Accurate inferences of solar meridional flow are crucial for understanding solar dynamo processes. Wave travel times, as measured on the surface, will change if the waves encounter perturbations, e.g., in the sound speed ...
  • Helioseismic measurements of elemental abundances in the sun's interior 
    Kosovichev, A. G (Astronomical Society of India, 1996)
    The method of 'secondary' helioseismic inversion, in which the equations of state and the thermal balance are used in addition to the hydrostatic equations, have been applied to determine the helium abundance in the Sun's ...
  • Helioseismology 
    Antia, H. M (Indian Institute of Astrophysics, Bangalore, 1988)
    Many of the oscillations observed at the solar surface have been identified with resonant normal modes of the entire solar body. Accurate measurements of frequencies of these modes enable us to study the internal structure ...
  • Helioseismology - Impact and Implications 
    Hasan, S. S (Astronomical Society of India, 1995-09)
  • Helioseismology and solar neutrinos 
    Chitre, S. M (Astronomical Society of India, 2000)
  • Helium absorption in the Sun 
    Evershed, John (Taylor and Francis, 1908-05)
  • Helium abundance in the solar envelope 
    Basu, S (Astronomical Society of India, 2000)
  • Helium Enhancement in the Metal-rich Red Giants of ω Centauri 
    Hema, B. P; Pandey, G; Kurucz, R. L; Prieto, C. A (IOP Publishing, 2020-07-01)
    The helium-enriched (He-enriched) metal-rich red giants of ω Centauri, discovered by Hema & Pandey using the low-resolution spectra from the Vainu Bappu Telescope, and confirmed by the analyses of the high-resolution spectra ...
  • Helmholtz Resonance Cell for Gas Phase Photoacoustic Studies 
    Ajith Prasad, K. C; Nampoori, V. P. N; Vallabhan, C. P. G (Indian Institute of Astrophysics, Bangalore, 1991)
    The design and frabication of a Helmholtz type gas phase photoacoustic cell are described. The cell which incorporates a miniature microphone (Knowles B.T.1759) along with a matching pre-amplifier is very sensitive and can ...
  • Hemispheric asymmetry of sunspot area in solar cycle 23 and rising phase of solar cycle 24: comparison of three data sets 
    Ravindra, B; Javaraiah, J (2015-08)
    Analysis of long-term solar data from different observatories is required to compare and confirm the various level of solar activity in depth. In this paper, we study the north–south asymmetry of monthly mean sunspot area ...
  • HER X-1 observed in a low state 
    Paul, B; Agrawal, P. C; Rao, A. R; Manchanda, R. K (Astronomical Society of India, 1996)
    The X-ray pulsar Her X-1 was observed on 14th December, 1992 with two balloon borne Xenon filled multicell proportional counters (XMPC) from Hyderabad, India. The source intensity was found to be very low in the 20-100 KeV ...
  • HF doppler and ionosonde observations on the onset conditions of equatorial spread F 
    Jayachandran, B; Balan, N; Rao, P. B; Sastri, J. H; Bailey, G. J (American Geophysical Union, 1993)
    The relative importance of height, vertical drift velocity, and electron density gradient of the postsunset bottomside (5.5 MHz) equatorial F region for the onset of spread F is studied using simultaneous HF Doppler radar ...
  • HF Doppler observations of small scale plasma motions in the equatorial electrojet 
    Sastri, J. H; Ramesh, K. B; Rao, J. V. S. V; Rao, D. R. K (The Royal Swedish Academy of Sciences, 1986-12)
    Recordings of the variations in phase path, P of reflections, at vertical incidence, from blanketing sporadic-E layers over Kodaikanal (dip 3.5°N) revealed small amplitude, quasi-sinusoidal oscillations of 45-180 s periods ...
  • HI deficiency in groups: what can we learn from Eridanus ? 
    Omar, A (Astronomical Society of India, 2004-07)
    The HI content of the Eridanus group of galaxies is studied using the GMRT observations and the HIPASS data. A significant Hi deficiency up to a factor of 2 2 - 3 is observed in galaxies in the Eridanus group. The deficiency ...
  • HI line analysis of Herbig Ae/Be stars using X-Shooter spectra 
    Shridharan, B; Mathew, Blesson; Arun, R; Cysil, T. B (Indian Academy of Sciences, 2023-12)
    Herbig Ae/Be stars are intermediate-mass pre-main sequence stars undergoing accretion through their circumstellar disk. The optical and infrared (IR) spectra of HAeBe stars show Hi emission lines belonging to Balmer, ...
  • Hi-C 2.1 Observations of Reconnection Nanojets 
    Patel, Ritesh; Pant, V (American Astronomical Society, 2022-10-20)
    One of the possible mechanisms for heating the solar atmosphere is the magnetic reconnection occurring at different spatiotemporal scales. The discovery of fast bursty nanojets due to reconnection in the coronal loops has ...
  • Hidden in plain sight: UVIT and MUSE discovery of a large, diffuse star-forming galaxy 
    Yadav, Jyoti; Mousumi Das; Barway, Sudhanshu; Combes, Francoise (EDP Sciences, 2022-01)
    We report the discovery of a nearby large, diffuse galaxy that shows star formation using Ultra Violet Imaging Telescope (UVIT) far-UV observations and archival optical data from Multi-Unit Spectroscopic Explorer (MUSE), ...
  • Higgs boson 
    Sivaram, C (Indian Academy of Sciences, 2012-10-25)
  • High abnormal rotation rates of sunspots and flare productivity 
    Suryanarayana, G. S (Elsevier, 2010-03)
    Solar activity, such as flares and CMEs, affect the interplanetary medium, and Earth’s atmosphere. Therefore, to understand the Space Weather, we need to understand the mechanisms of solar activity. Towards this end, we ...
  • High altitude (∼4520 m amsl) measurements of black carbon aerosols over Western trans-Himalayas: seasonal heterogeneity and source apportionment 
    Babu, S. S; Chaubey, Jai Prakash; Krishna Moorthy, K; Gogoi, M. M; Kompalli, S. K; Sreekanth, V; Bagare, S. P; Bhatt, B. C; Gaur, V. K; Prabhu, T. P; Shantikumar, N. S (American Geophysical Union, 2011-12)
    The first ever, year-round measurements of aerosol black carbon (BC) over the western part of trans- Himalayas are reported from Hanle (∼4520 m above mean sea level). The daily mean BC concentrations varied from as low as ...

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