Real-time electric potential with Weimer 2005 model

These plots are using NOAA-SEC ACE real-time data. The solar wind data are propagated to Earth with a 1-minute velocity average <V_x>=281.7 km/s from ACE's L1-position at around X_GSM=224.9 R_E (ACE's real-time X-position. ). The lead time is thus 72 min.

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Image features: Magnetic local time (MLT) (1-hour intervals) and magnetic latitudes (10-degree intervals) in Altitude Adjusted Corrected Geomagnetic Coordinates (AACGM) are shown as a web of solid lines.
Geographic coordinates are shown as dotted lines on a map of the continents. Local noon is at the top of the images and the dashed line indicates MLT=noon,midnight.
The top image is the forecast (around 72 min in the future), the bottom image the nowcast (about 60 min earlier).
Solar wind data were averaged over a 15 minute interval before the two times.

Forecast of ionospheric electric potential

Nowcast of ionospheric electric potential

Model: "Weimer_2005" by Daniel Weimer, Virginia Polytechnic Institute, National Institute of Aerospace, Hampton, VA
References: Weimer, D. R., An improved model of ionospheric electric potentials including substorm perturbations and application to the GEM November 24, 1996 event, Journal of Geophysical Research, Vol. 106, p. 407, 2001.
Weimer, D. R. (2005), Improved ionospheric electrodynamic models and application to calculating Joule heating rates, Journal of Geophysical Research, 110, A05306, doi:10.1029/2004JA010884.
Weimer, D. R. (2005), Predicting Surface Geomagnetic Variations Using Ionospheric Electrodynamic Models, Journal of Geophysical Research, 110, A12307, doi:10.1029/ 2005JA011270.

Curator: Dr. Lutz Rastaetter, CCMC at NASA GSFC
Authorizing NASA Official: Dr. Michael Hesse, NASA GSFC

Last updated: Tue August 27, 2007