TY - JOUR

T1 - GLOBAL QUANTITATIVE MODELS OF THE GEOMAGNETIC-FIELD IN THE CISLUNAR MAGNETOSPHERE FOR DIFFERENT DISTURBANCE LEVELS

AU - TSYGANENKO, NA

PY - 1987/11

Y1 - 1987/11

N2 - A previously proposed model (Tsyganenko and Usmanov, 1982, Planet. Space Sci. 30, 985) is further developed, using IMP-A, C, D, E, F, G, H, I, J and HEOS-1, -2 spacecraft measurements made during 1966–1980. The main improvement consists of a considerable extension of the modeling region by adding to the original data set a large number of magnetotail field measurements. Data points used in the present study cover a vast range of distances 4≲R≲70RE and comprise an unprecedentedly large number of measurements (a total of 36682 vector averages, almost twice as many as in our earlier data set). The data have been divided into groups corresponding to a sequence of Kp-index intervals, as well as different conditions in the solar wind. Mathematical representation of the magnetic field follows in its general features the approach developed in our earlier work, with some modifications. Two versions of the model are proposed, namely, (i) a “long” one with 26 parameters, valid up to distances ∼70RE, and (ii) a “truncated” one with 20 parameters and an applicability limit of ∼30RE.

AB - A previously proposed model (Tsyganenko and Usmanov, 1982, Planet. Space Sci. 30, 985) is further developed, using IMP-A, C, D, E, F, G, H, I, J and HEOS-1, -2 spacecraft measurements made during 1966–1980. The main improvement consists of a considerable extension of the modeling region by adding to the original data set a large number of magnetotail field measurements. Data points used in the present study cover a vast range of distances 4≲R≲70RE and comprise an unprecedentedly large number of measurements (a total of 36682 vector averages, almost twice as many as in our earlier data set). The data have been divided into groups corresponding to a sequence of Kp-index intervals, as well as different conditions in the solar wind. Mathematical representation of the magnetic field follows in its general features the approach developed in our earlier work, with some modifications. Two versions of the model are proposed, namely, (i) a “long” one with 26 parameters, valid up to distances ∼70RE, and (ii) a “truncated” one with 20 parameters and an applicability limit of ∼30RE.

KW - magnetosphere

KW - geomagnetic field

KW - modeling

U2 - 10.1016/0032-0633(87)90046-8

DO - 10.1016/0032-0633(87)90046-8

M3 - Article

VL - 35

SP - 1347

EP - 1358

JO - Planetary and Space Science

JF - Planetary and Space Science

SN - 0032-0633

IS - 11

ER -