Effective area for the northern polar cap magnetic activity index
نویسندگان
چکیده
منابع مشابه
Polar cap index comparisons with AMIE cross polar cap potential, electric field, and polar cap area
[1] The polar cap index (PCI) has been shown to be quite useful as an index of the electrodynamic processes within the high-latitude ionosphere. Here we use between 150 and 180 magnetometers to model the high-latitude electrodynamics with the assimilative mapping of ionospheric electrodynamics (AMIE) technique for all of 1997–2001. We compare AMIE calculations of the cross polar cap potential (...
متن کاملLithospheric Loading by the Northern Polar Cap on Mars
1589. Lunar and Planetary Institute, Houston. [CD-ROM] Zuber, M. T., D. E. Smith, R. J. Phillips, S. C. Solomon, W. B. Banerdt, G. A. Neumann, and O. Aharonson 1998a. Shape of the northern hemisphere ofET AL. Mars from the Mars Orbiter Laser Altimeter (MOLA). Geophys. Res. Lett.25, 4393–4396. Zuber, M. T., D. E. Smith, S. C. Solomon, J. B. Ashire, R. S. Azfal, O. Aharonson, K. Fishbaugh...
متن کاملPolar cap area and boundary motion during substorms
The area of the polar cap a.s a function of local time and substorm phase was measured using images from the Polar Ultraviolet Imager (UVI) for different interplanetary magnetic field (IMF) orientations during three substorms in January 1997. We measured changes in the polar cap area and motion of the poleward and equatorward boundary of the auroral oval. It was found that the polar cap boundar...
متن کاملPolar cap influx
This study uses digital ionosonde data from a cusp latitude station (Cambridge Bay, 77 CGM lat.) to study the convection into the polar cap. Days when the IMF magnetic field was relatively steady were used. On many days it was possible to distinguish an interval near noon MLT when the ionosonde data had a different character from that at earlier and later times. Based on our data, and other pub...
متن کاملPolar Cap Magnetic Variations and Their Relationship with the Interplanetary Magnetic Sector Structure
The relationship between polar geomagnetic variations and the polarity of the interplanetary magnetic sectors' has been studied for the quiet year 1965. It is found that during the day hours a system of ionospheric currents encircles the magnetic poles on every day. The current system may extend up to 15 ø from the pole but is strongest at 8ø-10 ø invariant colatitude. The current direction as ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Geophysical Research Letters
سال: 1999
ISSN: 0094-8276
DOI: 10.1029/1999gl003611