Ionospheric and geomagnetic response to the total solar eclipse on 1 August 2008 over Northern Hemisphere

摘要: [1] The ionospheric and geomagnetic response to the total eclipse of Sun on 1 August 2008 over Northern Hemisphere has been examined using 14 GPS, three ISR radar, magnetometer ground-based stations. Three different approaches were employed examine TEC depletion occurrence at GPS stations: determination parameters during solar with respect quiet day variations, comparison (ΣTEC) period measurements for same time, average daily obtained from eight stations compares values these The observations indicate obvious depression all was varying between 11% 40%. show that most started neck first contact followed by deeper negative deviation while area optical disk obscured getting larger. Periods also observed before time after fourth due earlier later obscuration corona observation time. incoherent scatter radar Svalbard, Tromso, Sondrestrom clear in electron density, temperature, ion velocity, plasma cutoff frequency passage Radar difference E F layers ionosphere temperature layer. field CBB, RESO, NUR two techniques, comparing variations eclipse, second Δ magnetic field. results decrease field, X Z components increase Y component both CBB RESO X, Z, range 15 28 nT 18–22 nT.