Other Astrophysics and Astronomy Commons^™

Ionospheric Evidence Of Lobe Reconnection For Northward Imf, Dora Csonge, Gerard Fasel, John Mann, Audrey Daucher, Owen Bradley, Aidan Hulbert, Thomas Lewer, Sun-Hee Lee, F. Sigernes, D. Lorentzen

Seaver College Research And Scholarly Achievement Symposium

It is believed that magnetic reconnection is one of the main mechanisms to transfer energy and momentum from the for the solar wind into the terrestrial environment. Dungey suggested that magnetic reconnection occurs on the dayside magnetosphere when the interplanetary magnetic field (IMF) is southward. Poleward moving auroral forms (PMAFs) have been identified in past studies as Ionospheric signatures of magnetic reconnection on the dayside.

However, magnetic reconnection can also occur for other geometrical orientations of the IMF. This presentation presents possible examples, 1 December 2021, for lobe reconnection during periods when the IMF x-component is negative, coupled with a …

Dayside Auroral Oval Expansion, Magnetic Flux Erosion, And Substorms, Dora Csonge, Parker Para, Gerard Fasel, Owen Bradley, Gasia Excel, Makena Swenski, Rachel Rodriguez, Sun-Hee Lee, John Mann, F. Sigernes, D. Lorentzen

Seaver College Research And Scholarly Achievement Symposium

Magnetic flux is eroded from the dayside magnetosphere when the interplanetary magnetic field (IMF) turns southward. During this period, the dayside auroral oval shifts equatorward as magnetic flux is transported anti-sunward to the magnetotail. Poleward-Moving Auroral Forms (PMAFs) are thought to be the ionospheric footprints of the flux tubes which are formed and transported tailward. Afterwards, magnetic reconnection occurs in the magnetotail, resulting in a substorm.

This study looks at the time between the onset of dayside magnetic reconnection and the onset of a substorm. Rates of dayside auroral oval equatorward shifts after southward turnings of the IMF are presented, …

Dayside North-South Aligned Auroral Arcs, Taiel Ramirez, Gerard J. Fasel, Wyatt Farrar, Mason Woolfolk, Andrea Black, Cullen Diggs, Clay Shin, Jordan Chiu, Sun-Hee Lee, John Mann, Fred Sigernes, Dag A. Lorentzen

Seaver College Research And Scholarly Achievement Symposium

Observations of North-South auroral arcs (or Sun-aligned) have been recorded for many years. Discrete North-South auroral arcs are located between 73-84° MLAT and are usually associated moderate auroral activity, low solar wind dynamic pressure, and a small IMF z-component. Some observations reported quasi-periodic poleward motions of North-South aligned dayside auroral arcs. This current statistical study contains nine years of All-Sky Camera images obtained from the Boreal Aurora Camera Constellation (BACC) from the Kjell Henriksen Observatory (KHO) in Longyearbyen, Svalbard (GEO: 78.148 N, 16.043 E; AACGM: 75.24 N, 111.21 E). The characteristics of discrete North-South dayside auroral arcs, including spatial and …