%0 Journal Article %1 doi:10.1002/2016SW001364 %A Adriani, O. %A Barbarino, G. C. %A Bazilevskaya, G. A. %A Bellotti, R. %A Boezio, M. %A Bogomolov, E. A. %A Bongi, M. %A Bonvicini, V. %A Bottai, S. %A Bruno, A. %A Cafagna, F. %A Campana, D. %A Carlson, P. %A Casolino, M. %A Castellini, G. %A De Donato, C. %A de Nolfo, G. A. %A De Santis, C. %A De Simone, N. %A Di Felice, V. %A Galper, A. M. %A Karelin, A. V. %A Koldashov, S. V. %A Koldobskiy, S. %A Krutkov, S. Y. %A Kvashnin, A. N. %A Leonov, A. %A Malakhov, V. %A Marcelli, L. %A Martucci, M. %A Mayorov, A. G. %A Menn, W. %A Mergé, M. %A Mikhailov, V. V. %A Mocchiutti, E. %A Monaco, A. %A Mori, N. %A Munini, R. %A Osteria, G. %A Palma, F. %A Panico, B. %A Papini, P. %A Pearce, M. %A Picozza, P. %A Ricci, M. %A Ricciarini, S. B. %A Sarkar, R. %A Scotti, V. %A Simon, M. %A Sparvoli, R. %A Spillantini, P. %A Stozhkov, Y. I. %A Vacchi, A. %A Vannuccini, E. %A Vasilyev, G. I. %A Voronov, S. A. %A Yurkin, Y. T. %A Zampa, G. %A Zampa, N. %D 2016 %J Space Weather %K pamela_exp %N 3 %P 210-220 %R 10.1002/2016SW001364 %T PAMELA's measurements of geomagnetic cutoff variations during the 14 December 2006 storm %U https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1002/2016SW001364 %V 14 %X Abstract Data from the Payload for Antimatter Matter Exploration and Light-nuclei Astrophysics (PAMELA) satellite experiment were used to measure the geomagnetic cutoff for high-energy (≳ 80MeV) protons during the 14 December 2006 geomagnetic storm. The variations of the cutoff latitude as a function of rigidity were studied on relatively short timescales, corresponding to spacecraft orbital periods (∼94 min). Estimated cutoff values were compared with those obtained by means of a trajectory-tracing approach based on a dynamical empirical modeling of the Earth's magnetosphere. We found significant variations in the cutoff latitude, with a maximum suppression of ∼7° at lowest rigidities during the main phase of the storm. The observed reduction in the geomagnetic shielding and its temporal evolution were related to the changes in the magnetospheric configuration, investigating the role of interplanetary magnetic field, solar wind, and geomagnetic parameters. PAMELA's results represent the first direct measurement of geomagnetic cutoffs for protons with kinetic energies in the sub-GeV and GeV region.

@article{doi:10.1002/2016SW001364, abstract = {Abstract Data from the Payload for Antimatter Matter Exploration and Light-nuclei Astrophysics (PAMELA) satellite experiment were used to measure the geomagnetic cutoff for high-energy (≳ 80MeV) protons during the 14 December 2006 geomagnetic storm. The variations of the cutoff latitude as a function of rigidity were studied on relatively short timescales, corresponding to spacecraft orbital periods (∼94 min). Estimated cutoff values were compared with those obtained by means of a trajectory-tracing approach based on a dynamical empirical modeling of the Earth's magnetosphere. We found significant variations in the cutoff latitude, with a maximum suppression of ∼7° at lowest rigidities during the main phase of the storm. The observed reduction in the geomagnetic shielding and its temporal evolution were related to the changes in the magnetospheric configuration, investigating the role of interplanetary magnetic field, solar wind, and geomagnetic parameters. PAMELA's results represent the first direct measurement of geomagnetic cutoffs for protons with kinetic energies in the sub-GeV and GeV region.}, added-at = {2019-08-08T15:27:28.000+0200}, author = {Adriani, O. and Barbarino, G. C. and Bazilevskaya, G. A. and Bellotti, R. and Boezio, M. and Bogomolov, E. A. and Bongi, M. and Bonvicini, V. and Bottai, S. and Bruno, A. and Cafagna, F. and Campana, D. and Carlson, P. and Casolino, M. and Castellini, G. and De Donato, C. and de Nolfo, G. A. and De Santis, C. and De Simone, N. and Di Felice, V. and Galper, A. M. and Karelin, A. V. and Koldashov, S. V. and Koldobskiy, S. and Krutkov, S. Y. and Kvashnin, A. N. and Leonov, A. and Malakhov, V. and Marcelli, L. and Martucci, M. and Mayorov, A. G. and Menn, W. and Mergé, M. and Mikhailov, V. V. and Mocchiutti, E. and Monaco, A. and Mori, N. and Munini, R. and Osteria, G. and Palma, F. and Panico, B. and Papini, P. and Pearce, M. and Picozza, P. and Ricci, M. and Ricciarini, S. B. and Sarkar, R. and Scotti, V. and Simon, M. and Sparvoli, R. and Spillantini, P. and Stozhkov, Y. I. and Vacchi, A. and Vannuccini, E. and Vasilyev, G. I. and Voronov, S. A. and Yurkin, Y. T. and Zampa, G. and Zampa, N.}, biburl = {https://www.bibsonomy.org/bibtex/2ec91c1b78f847113c06e1db1d8925905/pamela_exp}, doi = {10.1002/2016SW001364}, eprint = {https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1002/2016SW001364}, interhash = {7db1d1085a69582f41b12a90390671eb}, intrahash = {ec91c1b78f847113c06e1db1d8925905}, journal = {Space Weather}, keywords = {pamela_exp}, number = 3, pages = {210-220}, timestamp = {2019-08-08T15:27:28.000+0200}, title = {PAMELA's measurements of geomagnetic cutoff variations during the 14 December 2006 storm}, url = {https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1002/2016SW001364}, volume = 14, year = 2016 }