Physics
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusmsa24a..06s&link_type=abstract
American Geophysical Union, Spring Meeting 2009, abstract #SA24A-06
Physics
2400 Ionosphere (6929), 2712 Electric Fields (2411), 2736 Magnetosphere/Ionosphere Interactions (2431)
Scientific paper
During the current extended period of solar minimum conditions the high latitude ionosphere is experiencing recurrent episodes of elevated ion heating in the F-region. These events are correlated with the passage of coronal hole, fast steams by the Earth. Each of these CIR events involves first an enhanced density, slow solar wind followed by a low density, high-speed solar wind interaction with the magnetosphere. The first phase of this interaction lasts about a half-day while the second can span several days. For the past two years, beginning with the start of the International Polar Year (IPY), the Poker Flat Incoherent Scatter Radar (PFISR) has been operating almost continuously. The PFISR mode enables the ionosphere above PFISR to be observed through the E- and F-region as well as multi-beam drift measurements made. The first observation mode provides the ion heating in the F-region while the second provides the electric field in the vicinity of the radar. Each CIR event observed has an ionospheric ion temperature signature that begins with very cold values that rapidly elevate as the first phase of the CIR passage occurs. The ion temperatures, at all local times, then increase by over 100K. In the CIR event additional impulsive heating surges occur. These surges last on the order of hours and increase the ion temperature by many 100's of degrees. This presentation will show how the local electric field Joule heating rates, correlate with these distinct ion heating signature. Frictional heating of the ions over the F-region altitude range will also be presented in an effort to understand how energy deposition into the ionosphere-thermosphere (I-T) system is occurring.
Heinselman Craig
Kelly James J.
Nicolls Michael J.
Sojka Jan J.
No associations
LandOfFree
PFISR Observations of Ionospheric and Joule Heating During CIRs does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with PFISR Observations of Ionospheric and Joule Heating During CIRs, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and PFISR Observations of Ionospheric and Joule Heating During CIRs will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1108524