Abstract Details

Name: Dr. Vipin K. Yadav
Affiliation: Space Physics Laboratory (SPL), Vikram Sarabhai Space Centre (VSSC), Thiruvananthapuram, Kerala
Conference ID: ASI2017_1317
Title : Solar plasma (Alfven) wave observation at L1 point with the magnetic field measurements
Authors and Co-Authors : Anil Bhardwaj, Space Physics Laboratory (SPL), Vikram sarabhai Space Centre (VSSC), Thiruvananthapuram, Kerala
Abstract Type : Oral
Abstract Category : Sun and the Solar System
Abstract : Plasma, also known as the fourth state of matter, is an assembly of charged particles which shows the collective behaviour. In universe, many natural plasma systems exist such as stars, galaxies, interstellar medium (ISM), black-holes, pulsars, quasars, etc. Near to Earth, Sun is the most prominent natural plasma system. The solar plasma environment and the interplanetary magnetic field (IMF) have a strong effect on the space weather around the Earth. Therefore, it is essential for us to keep a track of all those solar events which can affect the Earth in one way or the other. There are several space missions dedicated to continuously observe the space weather by measuring the energetic charge particle flux as well as the large variations in the space magnetic field. Fluxgate Magnetometers (FGM) are used to measure low magnitude steady state magnetic fields and are regularly sent onboard space missions to measure the local IMF. In the space plasma environment, one of the special features is plasma waves which have a universal presence. Plasma waves are generated in many solar system plasmas such as planetary magnetospheres and ionospheres, ionosphere of some of planetary satellites, comets, interplanetary medium (IPM), etc. From sun also, along with energetic particles and IMF, a number of plasma waves come out. These solar plasma waves can be used to infer back the solar plasma properties which are otherwise not possible due the hostile solar environment. The plasma waves getting generated near the Sun carry the history of their generation mechanism along with them which provide information about the physical phenomena-taking place there. The first Lagrangian (L1) point can be an ideal location to carry outsolar plasma wave studies, away from the Sun as well as from the Earth's magnetosphere.There were several missions sent to study the sun such as: Helios 1 & 2, ISEE-3, Ulysses, YOHKOH, WIND, SOHO, ACE, TRACE, GENESIS, RHESSI, HINODE, STEREO, SMO, PICARD, SDO and IRIS. Some of these missions have FGMs onboard to measure the IMF magnitude and direction, which can be further analysed to decipher the solar plasma wave information. In this paper, the magnetic field data collected by the FGMs onboard ACE and WIND is used to extract the scientific information about the solar plasma waves reaching at the L-1 point.