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    • Ram Ajor Maurya

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    • Volume 29 Issue 1-2 March 2008 pp 103-105

      Magnetic and Velocity Field Variations in the Active Regions NOAA 10486 and NOAA 10488

      Ram Ajor Maurya Ashok Ambastha

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      We study the magnetic and velocity field evolution in the two magnetically complex active regions NOAA 10486 and NOAA 10488 observed during October–November 2003.We have used the available data to examine net flux and Doppler velocity time profiles to identify changes associated with evolutionary and transient phenomena. In particular, we report detection of rapid moving features observed in NOAA 10486 during the maximum phase of the X17.2/4B superflare of October 28, 2003. The velocity of this moving feature is estimated around 40 km/s, i.e., much greater than the usual H𝛼 flare-ribbons’ separation speed of 3–10 km/s, but similar to the velocity of seismic waves, i.e., ∼ 45 km/s reported earlier by Kosovichev & Zharkova (1998).

    • Volume 29 Issue 1-2 March 2008 pp 249-252

      H$\mathbf{\alpha}$ Intensity Oscillations in Large Flares

      Ram Ajor Maurya Ashok Ambastha

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      We reinvestigate the problem of Hα intensity oscillations in large flares, particularly those classified as X-class flares. We have used high spatial and temporal resolution digital observations obtained from Udaipur Solar Observatory during the period 1998–2006 and selected several events. Normalized Lomb–Scargle periodogram method for spectral analysis was used to study the oscillatory power in quiet and active chromospheric locations, including the flare ribbons.

  • Journal of Astrophysics and Astronomy | News

    • Continuous Article Publication

      Posted on January 27, 2016

      Since January 2016, the Journal of Astrophysics and Astronomy has moved to Continuous Article Publishing (CAP) mode. This means that each accepted article is being published immediately online with DOI and article citation ID with starting page number 1. Articles are also visible in Web of Science immediately. All these have helped shorten the publication time and have improved the visibility of the articles.

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

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