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Indian Institute of Astrophysics (IIA)

IAS EXPRESS 27/06/2023
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Indian Institute of Astrophysics (IIA) Recent studies Clearer picture of sun’s magnetic field Influence on interplanetary magnetic space Study findings Step closer to identifying source of solar mean magnetic field (SMMF) SMMF Mean value of line-of-sight (LOS) component of solar vector magnetic field Averaged over visible hemisphere Relationship with Interplanetary Magnetic Field (IMF) IMF Extension of coronal magnetic field Dragged by solar wind to interplanetary space LOS Direct path between two points Similarity between SMMF at Chromospheric heights Photospheric heights Chromospheric SMMF value is lower than photospheric SMMF Possibility of primordial magnetic field as source of SMMF Data technique Calculation and analysis of SMMF Magnetic field measurements at Chromosphere A reddish gaseous layer above photosphere of the sun Photosphere Visible surface of the Sun Electrical currents generated by hot, ionised gases in sun’s convection zone Convection zone Outermost layer of interior portion of sun Extended to about 200,000 km Solar Mean Magnetic Field (SMMF) Mean value of LOS component of solar vector magnetic field Averaged over visible hemisphere of the sun Magnetic field generated by electrical currents Acts as a magnetic dynamo inside the sun Significance Studies confined to magnetic field measurements at photosphere Understanding source of SMMF and driving parameters Helps in understanding SMMF effect on IMF Indian Institute of Astrophysics (IIA) Premier institute for research in Astronomy Astrophysics Related physics Historical background Origins in observatory set up in Madras, 1786 Formal function at Nungambakkam, Madras Observatory, 1792 Observatory moved to Kodaikanal, 1899 Kodaikanal Observatory became autonomous, Indian Institute of Astrophysics, 1971 HQ: Bengaluru Department of Science and Technology, Ministry of Science and Technology Funding: Department of Science and Technology Main observing facilities Kodaikanal Kavalur Gauribidanur Hanle Vainu Bappu Observatory at Kavalur Main optical observatory For nighttime astronomy since late 1960s Several telescopes in operation Foremost being the 2.34-metre Vainu Bappu Telescope Kodaikanal Observatory Principal centre of activity in observational solar and atmospheric physics

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