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Browsing by Author "Hegde, M"

Browsing by Author "Hegde, M"

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  • The 2010 outburst and pre-outburst optical spectrum of the recurrent nova U Scorpii 
    Anupama, G. C; Kamath, U. S; Ramaprakash, A. N; Kantharia, N. G; Hegde, M; Mohan, V; Kulkarni, M; Bode, M. F; Eyres, S. P. S; Evans, A; O Brien, T. J (EDP Sciences, 2013-11)
    Aims. We study the evolution of the recurrent nova U Scorpii during its outburst in 2010. Methods. Optical spectroscopic observations of the nova were obtained during 0.83–162.5 days after outburst maximum. Optical ...
  • Abnormal rotation rates of sunspots and durations of associated flares 
    Suryanarayana, G. S; Hiremath, K. M; Bagare, S. P; Hegde, M (EDP Sciences, 2015-08)
    Context. Short-duration and long-duration flares are important in terms of their association with coronal heating and coronal mass ejections, respectively. Sunspot motions in the photosphere have been known to be associated ...
  • Coronal hole oscillations inferred from the SDO/AIA data 
    Hegde, M; Hiremath, K. M; Doddamani, V. H (Elsevier B.V, 2014-07-15)
    With high temporal resolution (12 sec) of about two hours duration, data of a coronal hole structure in 171°A, 193°A and 211°A taken from SDO/AIA images is considered for examination of oscillations. After estimating the ...
  • Detection of Solar Filaments Using Suncharts from Kodaikanal Solar Observatory Archive Employing a Clustering Approach 
    Priyadarshi, Aditya; Hegde, M; Bibhuti Kumar Jha; Chatterjee, Subhamoy; Mandal, Sudip; Chowdhury, Mayukh; Banerjee, D (American Astronomical Society, 2023-02-01)
    With over 100 yr of solar observations, the Kodaikanal Solar Observatory (KoSO) is a one-of-a-kind solar data repository in the world. Among its many data catalogs, the “suncharts” at KoSO are of particular interest. ...
  • Extending the sunspot area series from Kodaikanal Solar Observatory 
    Jha, Bibhuti K; Hegde, M; Priyadarshi, Aditya; Mandal, Sudip; Ravindra, B; Banerjee, D (Frontiers, 2022-10)
    Kodaikanal Solar Observatory (KoSO) possesses one of world's longest and homogeneous records of sunspot observations that span more than a century (1904–2017). Interestingly, these observations (originally recorded in ...
  • Indian summer monsoon rainfall: dancing with the tunes of the Sun 
    Hiremath, K. M; Hegde, M; Soon, Willie (Elsevier, 2015-02)
    There is strong statistical evidence that solar activity influences the Indian summer monsoon rainfall. To search for a physical link between the two, we consider the coupled cloud hydrodynamic equations, and derive an ...
  • Kodaikanal digitized white-light data archive (1921-2011): Analysis of various solar cycle features 
    Mandal, Sudip; Hegde, M; Samanta, T; Hazra, G; Banerjee, D; Ravindra, B (EDP Sciences, 2017-05)
    Context. Long-term sunspot observations are key to understanding and predicting the solar activities and its effects on space weather. Consistent observations, which are crucial for long-term variations studies, are generally ...
  • Long-term Evolution of Magnetic Field Proxies as Deduced from Archival Data 
    Banerjee, D; Bibhuti Kumar Jha; Mandal, Sudip; Chatterjee, Subhamoy; Hegde, M; KoSO Digitization Team (Cambridge University Press on behalf of International Astronomical Union, 2023)
    Regular observations of the solar magnetic field are available only for about the last five cycles. Thus, to understand the origin of the variation of the solar magnetic field, it is essential to reconstruct the magnetic ...
  • Long-term Study of the Solar Filaments from the Synoptic Maps as Derived from a H Spectroheliograms of the Kodaikanal Observatory 
    Chatterjee, Subhamoy; Hegde, M; Banerjee, D; Ravindra, B (IOP Publishing, 2017-11)
    The century long ( 1914 – 2007 ) a H ( 656.28 nm ) spectroheliograms from the Kodaikanal Solar Observatory ( KSO ) have been recently digitized. Using these newly calibrated, processed images we study the ...
  • Machine learning─based identification of the solar disk and plages in Kodaikanal solar observatory historical suncharts 
    Mishra, Dibya Kirti; Chatterjee, Subhamoy; Jha, Bibhuti K; Raju, Hemapriya; Priyadarshi, Aditya; Hegde, M; Routh, Srinjana; Banerjee, D; Khan, M. Saleem (American Astronomical Society, 2026-03)
    Kodaikanal Solar Observatory (KoSO) is one of the oldest solar observatories, possessing an archive of multiwavelength solar observations, including white light, Ca II K, and Hα images spanning over a century. In addition ...
  • Night sky at the Indian Astronomical Observatory during 2000-2008 
    Stalin, C. S; Hegde, M; Sahu, D. K; Parihar, P. S; Anupama, G. C; Bhatt, B. C; Prabhu, T. P (Astronomical Society of India, 2008-09)
    This paper presents an analysis of the optical night sky brightness and extinction coefficient measurements in UBVRI at the Indian Astronomical Observatory (IAO), Hanle, during the period 2000–2008. They are obtained from ...
  • Predicting CME speed at 20R⊙ using machine learning approaches 
    Hegde, M (Springer Nature, 2025-09)
    Coronal mass ejections (CMEs) are significant drivers of space weather, and accurately predicting their propagation speed is crucial for mitigating their impact on Earth’s environment. In this study, we leverage machine ...
  • Recurring coronal holes and their rotation rates during the solar cycles 22-24 
    Prabhu, K; Ravindra, B; Hegde, M; Doddamani, V. H (Springer, 2018-05)
    Coronal holes (CHs) play a significant role in making the Earth geo-magnetically active during the declining and minimum phases of the solar cycle. In this study, we analysed the evolutionary characteristics of the Recurring ...
  • Rotation rates of coronal holes and their probable anchoring depths 
    Hiremath, K. M; Hegde, M (IOP Publishing, 2013-02-01)
    For the years 2001-2008, we use full-disk, SOHO/EIT 195 °A calibrated images to determine latitudinal and day to day variations of the rotation rates of coronal holes. We estimate the weighted average of heliographic ...
  • Solar wind associated with near equatorial coronal Hole 
    Hegde, M; Hiremath, K. M; Doddamani, V. H; Gurumath, S. R (2015-09)
    Present study probes temporal changes in the area and radiative flux of near equatorial coronal hole associated with solar wind parameters such as wind speed, density, magnetic field and temperature. Using high temporal ...
  • Thermal and magnetic field structure of near-equatorial coronal holes 
    Hegde, M; Hiremath, K. M (EDP Sciences, 2024-08)
    Context. Coronal holes are low-density and unipolar magnetic field structures in the solar corona that trigger geomagnetic disturbances on the Earth. Hence, it is important to understand the genesis and evolutionary behavior ...

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