HR: 1340h
AN: SH33A-1084    [Abstracts]
TI: Probing the 2-D Geometry of CIRs at Solar Minimum: Observations From STEREO
AU: * Simunac, K D
EM: ksimunac@cisunix.unh.edu
AF: University of New Hampshire, Space Science Center 39 College Road, Durham, NH 03824, United States
AU: Galvin, A B
EM: toni.galvin@unh.edu
AF: University of New Hampshire, Space Science Center 39 College Road, Durham, NH 03824, United States
AU: Kistler, L M
EM: lynn.kistler@unh.edu
AF: University of New Hampshire, Space Science Center 39 College Road, Durham, NH 03824, United States
AU: Popecki, M A
EM: mark.popecki@unh.edu
AF: University of New Hampshire, Space Science Center 39 College Road, Durham, NH 03824, United States
AU: Farrugia, C
EM: charlie.farrugia@unh.edu
AF: University of New Hampshire, Space Science Center 39 College Road, Durham, NH 03824, United States
AU: Moebius, E
EM: eberhard.moebius@unh.edu
AF: University of New Hampshire, Space Science Center 39 College Road, Durham, NH 03824, United States
AU: Ellis, L
EM: lorna.ellis@unh.edu
AF: University of New Hampshire, Space Science Center 39 College Road, Durham, NH 03824, United States
AU: Blush, L M
EM: lisa.blush@space.unibe.ch
AF: University of Bern, Physikalisches Institut, Bern, CH - 3012, Switzerland
AU: Bochsler, P
EM: bochsler@phim.unibe.ch
AF: University of Bern, Physikalisches Institut, Bern, CH - 3012, Switzerland
AU: Wurz, P
EM: peter.wurz@soho.unibe.ch
AF: University of Bern, Physikalisches Institut, Bern, CH - 3012, Switzerland
AU: Klecker, B
EM: berndt.klecker@mpe.mpg.de
AF: Max Planck Institute for Extraterrestrial Physics, Postfach 1312, Garching, 85741, Germany
AU: Wimmer-Schweingruber, R F
EM: wimmer@physik.uni-kiel.de
AF: Institute for Experimental and Applied Physics, University of Kiel, Kiel, 24098, Germany
AU: Thompson, B J
EM: barbara.j.thompson@nasa.gov
AF: NASA, Goddard Space Flight Center, Greenbelt, MD 20771, United States
AU: Luhmann, J G
EM: jgluhman@ssl.berkeley.edu
AF: University of California, Berkeley, Space Sciences Laboratory 7 Gauss Way # 7450, Berkeley, CA 94720, United States
AU: Russell, C T
EM: ctrussell@igpp.ucla.edu
AF: University of California, Los Angeles, IGPP, Los Angeles, CA 90095, United States
AU: Jian, L K
AF: University of California, Los Angeles, IGPP, Los Angeles, CA 90095, United States
AB: The twin STEREO observatories provide a unique opportunity to study the two-dimensional in-ecliptic geometry of structures in the solar wind. At the start of 2007 the AHEAD (A) and BEHIND (B) satellites were near Earth. By the end of the year they will each be separated from Earth by about 20 degrees longitudinally, and from each other by about 40 degrees. This arrangement is well suited to test the conceptual picture of CIRs in the ecliptic plane. The orbital radius of STEREO A is about 0.98 AU, while STEREO B is at about 1.03 AU. If A and B were at the same line of longitude they would be less than 2000 Earth radii apart. Observations show this small radial separation becomes important when predicting the arrival time at Earth of streams observed with STEREO B; stream fronts were seen to arrive at A and B almost simultaneously in mid 2007 when the spacecraft were separated by about 7 degrees. This suggests the leading edge of the stream is roughly aligned with the solar wind garden hose angle. We report on observations of the leading edges of co-rotating high-speed streams, and discuss the implications for space weather forecasting.
DE: 2102 Corotating streams
DE: 2164 Solar wind plasma
DE: 7924 Forecasting (2722)
SC: SPA-Solar and Heliospheric Physics [SH]
MN: 2007 Fall Meeting