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Browsing IIAP Publications by Title

Browsing IIAP Publications by Title

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  • Properties of ubiquitous magnetic reconnection events in the lower solar atmosphere 
    Joshi, Jayant; Rouppe van der Voort, Luc H. M (EDP Sciences, 2022-08)
    Context. Magnetic reconnection in the deep solar atmosphere can give rise to enhanced emission in the Balmer hydrogen lines, a phenomenon referred to as Ellerman bombs. Recent high-quality Hβ observations indicate that ...
  • Properties of umbral dots from stray light corrected hinode filtergrams 
    Louis, R. E; Mathew, S. K; Bellot Rubio, L. R; Kiyoshi, I; Ravindra, B; Raja Bayanna, A (IOP Publishing, 2012-06-20)
    High-resolution blue continuum filtergrams from Hinode are employed to study the umbral fine structure of a regular unipolar sunspot. The removal of scattered light from the images increases the rms contrast by a factor ...
  • Proponents of colliding cosmologies take exotic turns 
    Sivaram, C; Smith, D. M; Burbridge, G; Hoyle, F; Narlikar, J. V (American Institute of Physics, 1999-09)
  • Proposed Indian National Programme for the International Heliospheric Study 
    Bhonsle, R. V (Indian Institute of Astrophysics, Bangalore, 1986)
    "Ulysses" is an International Solar Polar Mission (ISPM) to be carried out jointly by European Space Agency (ESA) and NASA. The Ulysses spacecraft will be launched in May 1986 by means of a Space Shuttle. The primary ...
  • Proposed National Large Solar Telescope 
    Singh, J (Indian Academy of Sciences, 2008-06)
    Sun’s atmosphere is an ideal place to study and test many magnetohydrodynamic (MHD) processes controlling turbulent plasma. We wish to resolve some of the finest solar features (which remain unresolved presently) and study ...
  • Proposed SMEX to spectrally analyze the diffuse x-ray background: The Baryonic Extragalactic Structure Tracer (BEST) 
    Sanders, W. T; Henry, R. C; Bregman, J. N; Cen, R; Cox, D. P; Croft, R. A. C; Hammond, E. C; Hurwitz, M. V; McKee, C; Kimble, R. A; Porter, F. S; Serlemitsos, P. J; Stahle, C. K; Murthy, J; Raymond, J. C; Smith, R. K; Szymkowiak, A. E (SPIE--The International Society for Optical Engineering., 2003-03)
    The Baryonic Extragalactic Structure Tracer (BEST) is a SMEX-class mission that is designed to map the hot million-degree diffuse intergalactic and interstellar gas with high spectral resolution. It consists of an imaging ...
  • Proposed visible emission line space solar coronagraph 
    Singh, J; Prasad, B. R; Venkatakrishnan, P; Sankarasubramanian, K; Banerjee, D; Bayanna, R; Mathew, S; Murthy, J; Subramaniam, P; Ramesh, R; Kathiravan, S; Nagabhushana, S; Mahesh, P. K; Manoharan, P. K; Uddin, W; Sriram, S; Amit Kumar; Srivastava, N; Koteswara Rao; Nagendra, C. L; Chakraborty, P; Sriram, K. V; Venkateswaran, R; Krishnamurthy, T; Sreekumar, P; Sarma, K. S; Murthy, R; Navalgund, K. H; Samudraiah, D. R. M; Narayan Babu, P; Patra, A (Indian Academy of Sciences, 2011-01-25)
    The outer atmosphere of the sun – called the corona – has been observed during total solar eclipse for short periods (typically < 6 min), from as early as the eighteenth century. In the recent past, space-based instruments ...
  • Prospect for UV observations from the Moon 
    Safonova, M; Mathew, J; Mohan, Rekhesh; Sreejith, A. G; Murthy, J; Brosch, N; Kappelmann, N; Sharma, A; Narayan, R (Springer, 2014-10)
    Space astronomy in the last 40 years has largely been done from spacecraft in low Earth orbit (LEO) for which the technology is proven and delivery mechanisms are readily available. However, new opportunities are arising ...
  • Prospect for UV observations from the Moon. II. Instrumental design of an ultraviolet imager LUCI 
    Mathew, J; Prakash, A; Mayuresh, Sarpotdar; Sreejith, A. G; Nirmal, K; Ambily, S; Safonova, M; Murthy, J; Brosch, N (Springer, 2017-02)
    We present a design for a near-ultraviolet (NUV) imaging instrument which may be flown on a range of available platforms, including high-altitude balloons, nanosatellites, or space missions. Although all current UV space ...
  • Prospect for UV observations from the moon. III. assembly and ground calibration of lunar ultraviolet cosmic imager (LUCI) 
    Mathew, J; Nair, B. G; Safonova, M; Sriram, S; Prakash, A; Mayuresh, Sarpotdar; Ambily, S; Nirmal, K; Sreejith, A. G; Murthy, J; Kamath, P. U; Kathiravan, S; Prasad, B. R; Brosch, Noah; Kappelmann, Norbert; Gadde, Nirmal Suraj; Narayan, Rahul (Springer, 2019-03)
    The Lunar Ultraviolet Cosmic Imager (LUCI) is a near-ultraviolet (NUV) telescope with all-spherical mirrors, designed and built to fly as a scientific payload on a lunar mission with Team Indus—the original Indian entry to ...
  • Prospects for observations of transient UV Events with the TAUVEX UV observatory 
    Safonova, M; Sivaram, C; Murthy, J (Springer, 2008-11)
    Transient events have posed special problems in astronomy because of the intrinsic difficulty of their detection, and a new class of observatories such as the Pan-STARRS and LSST are coming up specifically to observe these ...
  • Prospects of constraining reionization model parameters using Minkowski tensors and Betti numbers 
    Akanksha, K; Pravabati, C; Ghara, Raghunath; Appleby, Stephen; Choudhury, T. R (IOP Publishing, 2021-05)
    We explore the possibility of constraining model parameters of the Epoch of Reionization (EoR) from 21cm brightness temperature maps, using a combination of morphological descriptors constructed from the eigenvalues of ...
  • Prospects of measuring a metallicity trend and spread in globular clusters from low-resolution spectroscopy 
    Baratella, M; Deepthi, S. Prabhu; Lima, L; Prugniel, P (EDP Sciences, 2022-05)
    Context. The metallicity spread, or the metallicity trend along the evolutionary sequence of a globular cluster, is a rich source of information to help understand the cluster physics (e.g., multiple populations) and stellar ...
  • A Proton Precession Magnetometer 
    Bhargava, B. N; Kasiviswanathan, G. A (Indian Meteorological Department, 1966)
    A simple portable proton precession magnetometer designed and constructed for Kodaikanal Observatory is described. Except for the signal amplifier, the instrument is transistorized. The accuracy of measurement of absolute ...
  • The proton synchrotron model of TeV gamma ray bursts and their detectability by AMANDA/ICECUBE type detectors 
    Bhattacharjee, P; Gupta, N (Elsevier, 2003-11)
    The detectability of a possible ``high'' energy (>100 GeV) component of gamma ray bursts (GRBs) using AMANDA/ICECUBE large area muon detectors is examined within the context of a specific model of such high energy gamma ...
  • Protoplanetary disks in Ks-band total intensity and polarized light 
    Ren, Bin B; Benisty, Myriam; Ginski, Christian; Tazaki, Ryo; Wallack, Nicole L; Milli, Julien; Garuf, Antonio; Bae, Jaehan; Facchini, Stefano; Menard, Francois; Pinilla, Paola; Swastik, C; Teague, Richard; Wahhaj, Zahed (EDP Sciences, 2023-12)
    Context. The diverse morphology among protoplanetary disks may result from planet-disk interactions, suggesting the presence of planets undergoing formation. The characterization of disks can provide information on the ...
  • Prototype for pulsar observations at low radio frequencies using log-periodic dipole antennas 
    Bane Kshitij, Suhas Trupti; Barve, Indrajit V; Gireesh, G. V. S; Kathiravan, C; Ramesh, R (SPIE-The International Society for Optical Engineering, 2022-01)
    A prototype for dedicated observations of pulsars and other astrophysical transients in the frequency range of 50 to 80 MHz has been recently commissioned in the Gauribidanur Radio Observatory near Bangalore in India. ...
  • Prototype segmented mirror telescope: a pathfinder of India's large optical-NIR telescope project 
    Parihar, P; Prasanna, Deshmukh; Jacob, A; Varun, Kumar; Goudar, Abhishek; Sriram, S; Nagabhusan, S; Amit Kumar, S; Govinda, K. V.; Sandeep, D. S.; Kemkar, P. M. M; Anupama, G. C (SPIE--The International Society for Optical Engineering, 2018-07)
    To cater the need of growing astronomical community of India, there is a proposal to install 10-12m size optical-NIR telescope, equipped with state of the art back-end instruments . A telescope of this size is possible ...
  • Pulsar Radio Emission Altitude from Curvature Radiation 
    Gangadhara, R. T (The University of Chicago Press, 2004-07-01)
    We assume that relativistic sources moving along dipolar magnetic field lines emit curvature radiation. The beamed emission occurs in the direction of tangents to the field lines, and to receive it, the sight line must ...
  • Pulsar radio emission geometry 
    Gangadhara, R. T (Springer Netherlands, 2008)
    Pulsar radio emission is belived to come from relativistic plasma accelerated along the dipolar magnetic field lines in pulsar magnetosphere. The beamed emission by relativistic sources occur in the direction of tangents ...

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