• Skip to primary navigation
  • Skip to main content
SRI logo
  • About
    • Press room
    • Our history
  • Expertise
    • Advanced imaging systems
    • Artificial intelligence
    • Biomedical R&D services
    • Biomedical sciences
    • Computer vision
    • Cyber & formal methods
    • Education and learning
    • Innovation strategy and policy
    • National security
    • Ocean & space
    • Quantum
    • Robotics, sensors & devices
    • Speech & natural language
    • Video test & measurement
  • Ventures
  • NSIC
  • Careers
  • Contact
  • 日本支社
Search
Close
Oceans & space publications March 1, 2010

IPY Observations of Ionospheric Yearly Variations from High- to Middle-Latitude Incoherent Scatter Radars

Citation

Copy to clipboard


Zhang, S. R., Holt, J. M., van Eyken, A. P., Heinselman, C., & McCready, M. (2010). IPY observations of ionospheric yearly variations from high‐to middle‐latitude incoherent scatter radars. Journal of Geophysical Research: Space Physics, 115(A3).

Abstract

Upper atmospheric research during the 2007 International Polar Year features unprecedented yearlong observations by incoherent scatter radars. This valuable data set, collected under very low solar and magnetic activity conditions from a set of four radars spanning middle (Millstone Hill), auroral (Poker Flat), and higher latitudes (Sondrestrom and Svalbard), enables us to address a fundamental question of background climatology on ionospheric yearly variations. The main focus of this paper is on the noon-time baseline annual and semiannual variations, with an emphasis on the less-known height dependency, for those geophysically important areas. The radar measurements of ion drifts allow us to examine dynamic effects which have not been well addressed previously. High-latitude ionospheric climatology shows some interesting features, in particular, the two semiannual peaks of electron density Ne. The two peaks, neither of which is near summer solstice, are essentially of equinoctial symmetry at very high latitude sites, where downward ion drifts are strong in summer thus causing Ne reduction. The symmetry vanishes at the midlatitude site. Clear phase progression is seen from the topside to the F2 peak at the midlatitude site. Comparisons of Millstone Hill data from this period and prior solar minima indicate decreases in the ion temperature throughout the F2 peak and the topside ionosphere. These decreases do not seem to be associated with solar flux and magnetic activity effects.

↓ View online

Share this

How can we help?

Once you hit send…

We’ll match your inquiry to the person who can best help you.

Expect a response within 48 hours.

Career call to action image

Make your own mark.

Search jobs

Our work

Case studies

Publications

Timeline of innovation

Areas of expertise

Institute

Leadership

Press room

Media inquiries

Compliance

Careers

Job listings

Contact

SRI Ventures

Our locations

Headquarters

333 Ravenswood Ave
Menlo Park, CA 94025 USA

+1 (650) 859-2000

Subscribe to our newsletter


日本支社
SRI International
  • Contact us
  • Privacy Policy
  • Cookies
  • DMCA
  • Copyright © 2023 SRI International
Manage Cookie Consent
To provide the best experiences, we use technologies like cookies to store and/or access device information. Consenting to these technologies will allow us to process data such as browsing behavior or unique IDs on this site. Not consenting or withdrawing consent, may adversely affect certain features and functions.
Functional Always active
The technical storage or access is strictly necessary for the legitimate purpose of enabling the use of a specific service explicitly requested by the subscriber or user, or for the sole purpose of carrying out the transmission of a communication over an electronic communications network.
Preferences
The technical storage or access is necessary for the legitimate purpose of storing preferences that are not requested by the subscriber or user.
Statistics
The technical storage or access that is used exclusively for statistical purposes. The technical storage or access that is used exclusively for anonymous statistical purposes. Without a subpoena, voluntary compliance on the part of your Internet Service Provider, or additional records from a third party, information stored or retrieved for this purpose alone cannot usually be used to identify you.
Marketing
The technical storage or access is required to create user profiles to send advertising, or to track the user on a website or across several websites for similar marketing purposes.
Manage options Manage services Manage vendors Read more about these purposes
View preferences
{title} {title} {title}