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Browsing by Author "Subramanian, P"

Browsing by Author "Subramanian, P"

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  • Amplitude of solar wind density turbulence from 10 to 45 R⊙ 
    Sasikumar Raja, K; Ingale, M; Ramesh, R; Subramanian, P; Manoharan, P. K; Janardhan, P (American Geophysical Union, 2016-12)
    We report on the amplitude of the density turbulence spectrum ( urn:x-wiley:jgra:media:jgra53108:jgra53108-math-0001) and the density modulation index (δN/N) in the solar wind between 10 and 45R⊙. We derive these quantities ...
  • Automated detection of solar radio bursts using a statistical method 
    Singh, D; Raja, K. S; Subramanian, P; Ramesh, R; Monstein, Christian (Springer, 2019-11)
    Radio bursts from the solar corona can provide clues to forecast space-weather hazards. After recent technology advancements, regular monitoring of radio bursts has increased and large observational datasets are produced. ...
  • Cosmic ray electron acceleration in the remnant of nova GK Persei? 
    Kantharia, N. G; Anupama, G. C; Subramanian, P (Tata Institute of Fundamental Research, 2005)
    Radio observations of the nova remnant of GK Per around 1985 (epoch 1) have shown it to have a spectral index of -0.4 (S propto nu^alpha) at frequencies <1.4 GHz and a spectral index of -0.7 at frequencies >1.4 GHz (Seaquist ...
  • Dissipation scale lengths of solar wind turbulence 
    Sasikumar Raja, K; Subramanian, P; Ingale, M; Ramesh, R (IOP Publishing, 2019-02-10)
    Knowing the lengthscales at which turbulent fluctuations dissipate is key to understanding the nature of weakly compressible magnetohydrodynamic turbulence. We use radio wavelength interferometric imaging observations ...
  • Electron acceleration in a post-flare decimetric continuum source 
    Subramanian, P; White, S. M; Karlický, M; Sych, R; Sawant, H. S; Ananthakrishnan, S (EDP Sciences, 2007-06)
    Aims.To calculate the power budget for electron acceleration and the efficiency of the plasma emission mechanism in a post-flare decimetric continuum source. Methods.We have imaged a high brightness temperature ($\sim ...
  • Energetics of solar coronal mass ejections 
    Subramanian, P; Vourlidas, Angelos (EDP Sciences, 2007-05)
    Aims.We investigate whether solar coronal mass ejections are driven mainly by coupling to the ambient solar wind or through the release of internal magnetic energy. Methods.We examine the energetics of 39 flux-rope like ...
  • An Evaluation of Possible Mechanisms for Anomalous Resistivity in the Solar Corona 
    Singh, K. A. P; Subramanian, P (Springer Netherlands, 2007-07)
    A wide variety of transient events in the solar corona seem to require explanations that invoke fast reconnection. Theoretical models explaining fast reconnection often rely on enhanced resistivity. We start with data ...
  • Further Constraints on Electron Acceleration in Solar Noise Storms 
    Subramanian, P; Becker, P. A (Springer, 2006-08)
    We reexamine the energetics of nonthermal-electron acceleration in solar noise storms. A new result is obtained for the minimum nonthermal-electron number density required to produce a Langmuir-wave population of sufficient ...
  • Hybrid viscosity and magnetoviscous instability in hot, collisionless accretion disks 
    Subramanian, P; Becker, P. A; Kafatos, M. (Springer Netherlands, 2008)
    We aim to illustrate the role of hot protons in enhancing the magnetorotational instability (MRI) via the “hybrid” viscosity, which is due to the redirection of protons interacting with static magnetic field perturbations, ...
  • Relativistic outflows from advection-dominated accretion disks around black holes 
    Subramanian, P; Becker, P. A; Kazanas, D (Astronomical Society of India, 2001)
  • TeV blazar variability: the firehose instability? 
    Subramanian, P; Shukla, A; Becker, P. A (Wiley-Blackwell, 2012-06)
    Recently observed minute-time-scale variability of blazar emission at TeV energies has imposed severe constraints on jet models and TeV emission mechanisms. We focus on a robust jet instability to explain this variability. ...
  • Turbulent Density Fluctuations and Proton Heating Rate in the Solar Wind from 9-20 R 
    Sasikumar Raja, K; Subramanian, P; Ramesh, R; Vourlidas, Angelos; Ingale, M (IOP Publishing, 2017-12)
    We obtain scatter-broadened images of the Crab Nebula at 80 MHz as it transits through the inner solar wind in 2017 and 2016 June. These images are anisotropic, with the major axis oriented perpendicular to the radially ...
  • Turbulent proton heating rate in the solar wind from 5–45 R⊙ 
    Sasikumar Raja, K; Subramanian, P; Ingale, M; Ramesh, R; Maksimovic, Milan (IOP Publishing, 2021-06-20)
    Various remote sensing observations have been used so far to probe the turbulent properties of the solar wind. Using the recently reported density modulation indices that are derived using angular broadening observations ...

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