TY - JOUR A1 - Lepping, R. P. A1 - Narock, T. W. A1 - Chen, H. T1 - Comparison of magnetic field observations of an average magnetic cloud with a simple force free model: the importance of field compression and expansion JO - Ann. Geophys. J1 - ANGEO VL - 25 IS - 12 SP - 2641 EP - 2648 Y1 - 2008/01/02 PB - Copernicus Publications SN - 0992-7689 UR - http://www.ann-geophys.net/25/2641/2007/ L1 - http://www.ann-geophys.net/25/2641/2007/angeo-25-2641-2007.pdf ER -