Authors

X. Wang; R. Eastes; B. W. Reinisch; S. Bailey; C. E. Valladares;T. Woods

Comments

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Abbreviated Journal Title

J. Geophys. Res-Space Phys.

Keywords

WAVE TYPE OSCILLATIONS; VARIABILITY; IONOSPHERE; PROFILES; CYCLE; FOF2; Astronomy & Astrophysics

Abstract

[1] The short-term relationship of the equatorial peak electron density and the solar short-wavelength irradiance is examined using foF2 observations from Jicamarca, Peru and recent solar irradiance measurements from satellites. Solar soft X-ray measurements from both the Student Nitric Oxide Explorer (SNOE) ( 1998 - 2000) and Thermosphere Ionosphere Mesosphere Energetics Dynamics ( TIMED) ( 2002 - 2004) satellites as well as extreme ultraviolet (EUV) measurements from the TIMED satellite are used. Soft X-rays show similar or higher correlation with foF2 at short timescales ( 27 days or less) than EUV does, although the EUV correlation is higher for longer periods. For the short-term variations, both SNOE and TIMED observations have a higher correlation in the morning ( similar to 0.46) than in the afternoon ( similar to 0.1). In the afternoon, SNOE observations have a higher correlation ( similar to 0.2) with foF2 than the TIMED observations ( similar to 0.1 correlation), which may be due to differences in the solar cycle. At morning times, foF2 has a similar to 27-day variation, consistent with the solar rotation rate. After noon, but not in the morning, a similar to 13.5-day variation consistently appears in foF2. This similar to 13.5-day variation is attributed to geomagnetic influences.

Journal Title

Journal of Geophysical Research-Space Physics

Volume

112

Issue/Number

A6

Publication Date

1-1-2007

Document Type

Article

Language

English

First Page

5

WOS Identifier

WOS:000247371300004

ISSN

0148-0227

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