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Browsing by Author "Joshi, A."

Browsing by Author "Joshi, A."

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  • Analysis of the 9th November 1990 flare 
    Joshi, A.; Uddin, W. (2000)
    In this paper we present complete two-dimensional measurements of the observed brightness of the 9th November 1990 Hα flares, using a PDS microdensitometer scanner and image processing software MIDAS. The resulting isophotal ...
  • Asymmetries during the maximum phase of solar cycle 22 
    Joshi, A. (1994)
    This paper presents the result of studies of the asymmetries (N-S and E-W) for different manifestations of solar activity events (sunspot groups, Hα flares and active prominence/filaments) during the maximum-phase (1989-1991) ...
  • Authenticating the Presence of a Relativistic Massive Black Hole Binary in OJ 287 Using Its General Relativity Centenary Flare: Improved Orbital Parameters. 
    Dey, Lankeswar et al.; Gopinathan, M.; Joshi, A.; Pandey, J. C. (Astrophysical journal, 2018-10)
    Results from regular monitoring of relativistic compact binaries like PSR 1913+16 are consistent with the dominant (quadrupole) order emission of gravitational waves (GWs). We show that observations associated with the ...
  • Coronal holes and flare index: A Correlation Study 
    Joshi, A. (2000)
    The correlation between the presence of coronal holes and flare indices has been inves- tigated for the period from 1976 to 1995. The analysis shows that in the cases of 227 Carrington rotations (CRs) backward time lags ...
  • Cosmic-ray periodicity at 170 days 
    Joshi, A. (1998)
    Power-spectral analysis of cosmic-ray indices (CRI) data for the years 1989–1991 shows a 170-day periodicity of cosmic rays. The periodicity is related to a strong magnetic field. Power- spectral analysis of the ...
  • Dynamics of limb flar and associated primary and secondary post flare loops 
    Uddin, W.; Joshi, B.; Chandra, R.; Joshi, A. (2003)
    In this paper we present the analysis of M 1.8 class (GOES SXR) limb flare and associated post flare loops of 2 May, 2001 which erupted on the west limb in NOAA 9433 (N15, W88). The flare started at around 00:32 UT from a ...
  • Energetics and dynamics of an impulsive flare on March 10, 2001 
    Chandra, R.; Jain, R.; Uddin, W.; Yoshimura, K.; Kosugi, T.; Sakao, T.; Joshi, A.; Deshpande, M. R. (2006)
    We present Hα observations from ARIES (Nainital) of a compact and impulsive solar flare that occurred on March 10, 2001 and which was associated with a CME. We have also analyzed HXT, SXT/Yohkoh observations as well ...
  • Flares from the giant ar 9433 on 24 april 2001 
    Joshi, A.; Chandra, R.; Uddin, W. (2003)
    We present Hα CCD observations of three small-to-medium-size two-ribbon flares observed in the giant AR 9433 on 24 April 2001. Flare observations at other associated wavelengths (e.g., soft X-rays (SXR), hard X-rays (HXR), ...
  • Intermediate-term periodicities in soft x-ray flare index during solar cycles 21, 22 and 23 
    Joshi, B.; Joshi, A. (2005)
    We have analyzed the intermediate-term periodicities in soft X-ray flare index (FIsₓR) during solar cycles 21, 22 and 23. Power-spectral analysis of daily FIsₓR reveals a significant period of 161 days in cycle 21 which ...
  • Multi-wavelength observations of an unusual impulsive flare associated with CME 
    Uddin, W.; Jain, R.; Yoshimura, K.; Chandra, R.; Sakao, T.; Kosugi, T.; Joshi, A.; Despande, M. R. (2004)
    We present the results of a detailed analysis of multi-wavelength observations of a very impulsive solar flare 1B/M6.7, which occurred on 10 March, 2001 in NOAA AR 9368 (N27 W42). The observations show that the flare is ...
  • The north–south asymmetry of soft x-ray flare index during solar cycles 21, 22 and 23 
    Joshi, B.; Joshi, A. (2004)
    In this paper the N–S asymmetry of the soft X-ray flare index (FI sxr) during solar cycles 21, 22 and 23 has been analyzed. The results show the existence of a real N–S asymmetry which is strengthened during solar minimum. ...
  • Short note: a solar flare event in Ca II K on 1989 March 9 
    Uddin, W.; Joshi, A. (1989)
    On 1989 March 9 a flare was recorded in Ca II K near a complex spot group (NOAA active region No. 5395: 35°N, 42°E) of magnetic class D and strength 3000 gauss (Solar Geophysical Data Pt I No. 537). The telescope was a ...
  • Stochastic Modeling of Multiwavelength Variability of the Classical BL Lac Object OJ 287 on Timescales Ranging from Decades to Hours. 
    Goyal, A. et al.; Joshi, A.; Gopinathan, M.; Pandey, J. C. (Astrophysical journal, 2018-08)
    We present the results of our power spectral density analysis for the BL Lac object OJ 287, utilizing the FermiLAT survey at high-energy γ-rays, Swift-XRT in X-rays, several ground-based telescopes and the Kepler satellite in ...
  • Study of a quiescent prominence 
    Joshi, A.; Gaur, V. P.; Pande, M. C. (1994)
    The evolution of a quiescent prominence (QP) seen on the NW solar limb from 11 to 13 June 1991 has been studied. The observations of the main-phase activity of the of the QP on 12 June 1991 are also discussed.
  • Superactive region AR 5395 of solar cycle 22 
    Joshi, A. (1993)
    During the ascending phase of solar cycle 22, the NOAA active region AR 5395 of March 1989 was responsible for a sudden jump in solar activity. The evolution of the active region during its its three successive rotations ...

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