Browsing IIAP Publications by Title

Now showing items 4932-4951 of 5238

The two components of the solar activity cycle as a consequence of the shock transition model of the solar magnetic cycle

Gokhale, M. H (Indian Institute of Astrophysics, 1979-11)

Justification is given for comparing the consequences of the shock transition model of the solar magnetic cycle with important observed properties of the solar activity cycle without waiting for the basic postulates of the ...
Two longitudinal zones of apparent inhibition of sunspots on the solar disc

Chidambara Ayyar, P. R (Government Observatory, Madras, 1932-07-26)
Two New Super Li-rich Core He-burning Giants: A New Twist to the Long Tale of Li Enhancement in K Giants

Bharat Kumar, Y; Singh, R; Reddy, B. E; Zhao, G (IOP Publishing, 2018-05-10)

In this Letter we report two new super Li-rich K giants, KIC2305930 and KIC12645107, with Li abundances exceeding that of the interstellar medium (ISM; A(Li) ≥ 3.2 dex). Importantly, both of the giants have been classified ...
Two ribbon flare on April 3, 1980

Jain, Rajmal (Indian Institute of Astrophysics, Bangalore, 1988)

H alpha observations of a two ribbon (TR) flare which were associated with exceptionally high microwave (MW) and hard X-ray emissions are presented and discussed. The good spatial and temporal resolution of the H alpha ...
Two-dimensional Monte Carlo radiative transfer modelling of the disc-shaped secondary of Epsilon Aurigae

Muthumariappan, C; Parthasarathy, M (Wiley Blackwell, 2012-07)

We present two-dimensional Monte Carlo radiative transfer models for the disc of the eclipsing binary Epsilon Aurigae by fitting its spectral energy distribution (SED) from optical to far-infrared (IR) wavelengths. We also ...
Two-dimensional pressure structure of a coronal loop

Krishan, V (Springer, 1985)

The steady-state pressure structure of a solar coronal loop is discussed using the theory of magnetohydrodynamical turbulence in cylindrical geometry. The steady state is represented by the superposition of two ...
Two-dimensional segmentation of small convective patterns in radiation hydrodynamics simulations

Lemmerer, B; Utz, D; Hanslmeier, A; Veronig, A; Thonhofer, S; Grimm-Strele, H; Kariyappa, R (EDP Sciences, 2014-03)

Context. Recent results from high-resolution solar granulation observations indicate the existence of a population of small granular cells that are smaller than 600 km in diameter. These small convective cells strongly ...
Two-stage evolution of an extended C-class eruptive flaring activity from sigmoid active region NOAA 12734: SDO and Udaipur-CALLISTO observations

Joshi, B; Mitra, P. K; Bhattacharyya, R; Upadhyay, K; Oberoi, Divya; Sasikumar Raja, K; Monstein, Christian (Springer, 2021-06)

In this article, we present a multi-wavelength investigation of a C-class flaring activity that occurred in the active region NOAA 12734 on 8 March 2019. The investigation utilizes data from the Atmospheric Imaging Assembly ...
Two-wave mixing and light-induced absorption dynamics in photorefractive BaTiO3 crystals

Banyal, R. K; Prasad, B. R (Indian Institute of Science, 2003-08)

Steady-state and temporal measurements of TWM and LIA have been carried out in PR BaTiO3 crystals at different wavelengths and intensities of laser light. The observed behavior is interpreted in terms of two-center charge ...
TXS 1206 + 549: a new γ -ray-detected narrow-line Seyfert 1 galaxy at redshift 1.34?

Rakshit, S; Schramm, Malte; Stalin, C. S; Tanaka, I; Paliya, Vaidehi S; Pal, Indrani; Kotilainen, Jari; Shin, Jaejin (Oxford University Press on behalf of the Royal Astronomical Society, 2021-06)

Radio and γ-ray loud narrow-line Seyfert 1 galaxies (NLS1s) are unique objects to study the formation and evolution of relativistic jets, as they are believed to have high accretion rates and powered by low mass black holes ...
TXS 1433+205: The most distant gamma-ray emitting FR II radio galaxy

Paliya, Vaidehi S; Saikia, D. J; Stalin, C. S (Oxford University Press on behalf of Royal Astronomical Society, 2023-03)

The orientation of the jet axis to the line of sight of the observer plays a major role in explaining the phenomena observed from blazars and radio galaxies. In the γ -ray band, only a handful of radio galaxies have been ...
Type I radio bursts and the minimum between sunspot cycles 22 & 23

Ramesh, R; Shanmugha Sundaram, G. A (European Southern Observatory, 2000-12)

Spectral observations of Type I radio bursts published in the Solar Geophysical Data are used to show that the minimum between solar cycles 22 & 23 occurred during October 1996.
Type Ia supernova SN 2003du: Optical observations

Anupama, G. C; Sahu, D. K; Jose, J (EDP Sciences, 2005-01)

UBVRI photometry and optical spectra of type Ia supernova SN 2003du obtained at the Indian Astronomical Observatory for nearly a year since discovery are presented. The apparent magnitude at maximum was $B=13.53\pm ...
Type Ia supernovae SN 2013bz, PSN J0910 + 5003, and ASASSN-16ex: similar to 09dc-like?

Tiwari, S; Chakradhari, N. K; Sahu, D. K; Anupama, G. C; Kumar, B; Sahu, K. R (Oxford University Press on behalf of Royal Astronomical Society, 2023-06)

We present optical photometric and spectroscopic studies of three supernovae (SNe): SN 2013bz, PSN J0910 + 5003, and ASASSN-16ex (SN 2016ccj). UV–optical photometric data of ASASSN-16ex obtained with the Swift ...
Type Ia Supernovae: Progenitors and Peculiarity

Nomoto, K; Tanaka, M; Kawabata, K. S; Sahu, D. K; Anupama, G. C (American Institute of Physics, 2007-08)

Among the controversial issues on Type Ia supernovae (SNe Ia), we discuss (1) the evolutionary paths of the progenitor systems to SNe Ia, especially, the thermal stability of hydrogen shell burning in accreting white dwarfs, ...
Type Ib supernova 2008d associated with the luminous x-ray transient 080109: an energetic explosion of a massive helium star

Tanaka, M; Tominaga, N; Nomoto, K; Valenti, S; Sahu, D. K; Minezaki, T; Yoshii, Y; Yoshida, M; Anupama, G. C; Benetti, S; Chincarini, G; Valle, M. D; Mazzali, P. A; Pian, E (The American Astronomical Society, 2009-02)

We present a theoretical model for supernova SN 2008D associated with the luminous X-ray transient 080109. The bolometric light curve and optical spectra of the SN are modeled based on the progenitor models and the explosion ...
Type II burst high time resolution and polarization characteristics at frequencies higher than 200 MHz

Zlobec, P; Thejappa, G (Hvar Observatory Bulletin, 1987)

Some new results based on high time resolution and polarization studies of solar type II radio bursts are presented. It is found that the fine structures are present in some events whereas they are completely absent in few ...
Type II solar radio emission - A self-consistent approach

Thejappa, G (Kluwer Academic Publishers, 1987-03)

An attempt is made to construct a self-consistent model for type II radio bursts. It is proposed that a majority of the type II shocks are super-critical and the reflected ions from such type II shock fronts are described ...
Type-I Solar Radio Bursts

Gopalswamy, N (Indian Institute of Astrophysics, Bangalore, 1986)

A brief review of the recent work done on Type-I radio emission in the Indian Institute of Astrophysics is presented. The most plausible low frequency turbulence needed to generate the type-I bursts is shown to be ion-sound ...
UBV Observations of R-Coronae Type Variables and Related Objects

Kameswara Rao, N (D. Reidel Publishing Co., 1980-07)

UBV observations obtained during the period 1972-73 are presented for the following five R CrB stars: GU Sgr, SU Tau, XX CAm, DZ And, V973 Oph, and the hydrogen-poor, carbon-rich stars BD + 10 deg 2179 and HD 137613. ...

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