http://nopr.niscair.res.in/handle/123456789/10599 <b>Includes papers from IHY workshop Nainital</b> Search the Channel search http://nopr.niscair.res.in/simple-search http://nopr.niscair.res.in/handle/123456789/10618 Title: Study of upper atmospheric emissions using Mesosphere Lower Thermosphere Photometer (MLTP) designed at ARIES <br/> <br/>Authors: Bangia, T; Bhattacharjee, S; Guharay, A; Taori, A; Uddin, Wahab <br/> <br/>Abstract: Mesosphere Lower Thermosphere Photometer (MLTP) has been designed at ARIES for studying mesosphere lower thermosphere coupling processes. MLTP utilizes f/2 optics with 4^o circular field of view. It has seven narrow bandwidth (FWHM ~ 4 Å) interference filters mounted on a geared filter plate housed in filter chamber under precise temperature controlled conditions. Out of these seven filters, filter at 630 nm is meant to monitor ionospheric F- region airglow emission due to atomic oxygen. MLTP has been successfully installed and made operational at Space Weather Laboratory of ARIES. <br/> <br/>Page(s): 325-329 http://nopr.niscair.res.in/handle/123456789/10617 Title: Solar Vector Magnetograph: Instrument status and vector field measurements of non-flaring solar active regions <br/> <br/>Authors: Gosain, Sanjay; Venkatakrishnan, P <br/> <br/>Abstract: The Solar Vector Magnetograph (SVM) of Udaipur Solar Observatory (USO) is an imaging polarimeter based on a tunable Fabry-Perot filter. In the present paper, the development efforts during phase-II of this instrument have been presented. These include: (i) installation of the instrument on a new robotic mount at the island site of USO; (ii) polarimetric calibrations of the instrument; and (iii) development of tools for performing data reduction and Stokes inversion. In particular, the Milne-Eddington inversion of polarized line profiles of the entire active region using parallel computing concept is described. Finally, few preliminary results regarding the vector magnetic field and other activity parameters of sunspots in non-flaring solar active regions are discussed. Such observations serve as a reference for comparison with flaring active regions. <br/> <br/>Page(s): 319-324 http://nopr.niscair.res.in/handle/123456789/10616 Title: A Dual beam H<img src='/image/spc_char/alpha.gif' border=0> Doppler system to acquire, analyse and anticipate solar eruptive events directed towards Earth <br/> <br/>Authors: Joshi, Anand D; Mathew, Shibu K; Srivastava, Nandita; Martin, Sara F; Gupta, Sudhir Kumar <br/> <br/>Abstract: A new instrument with a dual-beam Hα Doppler system is being developed at the Udaipur Solar Observatory (USO) in order to improve the quality and quantity of data on quiet, activated and erupting filaments and prominences on the Sun, especially those associated with geo-effective coronal mass ejections. These data can be potentially used to construct three-dimensional topology of erupting filaments as they leave the surface of the Sun and can be compared with multi-wavelength data obtained from space missions such as STEREO, SOHO and Hinode. The characterization of various optical components for the instrument is being carried out, and some preliminary results are presented in the paper. <br/> <br/>Page(s): 315-318 http://nopr.niscair.res.in/handle/123456789/10615 Title: Influence of solar variability on rainwater <br/> <br/>Authors: Joshi, Indira Sudhir <br/> <br/>Abstract: The significant effect of the high-energy charged particles, entering the earth’s environment from interplanetary space, on the space and terrestrial weather is well known. Solar flares emit electron particles. These electrons interact with Earth’s magnetic field and atmosphere causing weather, geophysical and behavioural changes. These charged particles from the sun affect Earth’s magnetic field and increase atmospheric nucleation which then affects cloud formation and thus the weather. Keeping this in view, a study has been undertaken to examine the changes in rainwater associated with the high energy charged particles entering the earth’s environment from interplanetary space. It is observed from the analysis that an increase in proton and electron fluences is followed by an increase in electrical conductivity and decrease in pH of rainwater over Pune. <br/> <br/>Page(s): 312-314