Ionospheric modification from under-dense heating by high-power HF transmitter

Spencer Kuo, Arnold Snyder, Evgeny Mishin, Paul Kossey, James Battis

Research output: Contribution to journalArticle

Abstract

Under-dense HF heating experiments were conducted near local solar noon as well as in the nighttime with the HF heater transmitting at 9.1 MHz directed along the geomagnetic zenith and run at 2 min on and 2 min off. The effective isotropic radiated power of the HF transmitter exceeded 3 GW. The Digisonde operated in a fast mode was used to monitor the temporal evolution of the ionospheric electron density distributions in the bottomside of the ionosphere (in the ranges from 90 to 190 km in the noontime and from 230 to 350 km in the nighttime). The electron temperature distributions were then evaluated. The results show that the electron density distributions are modified continuously over the experimental periods. In the noontime, the electron density decreases/increases in time in the region below/above a height at about 140 km, manifesting the change of the balance between the photoionization and the electron-ion recombination and the electron-oxygen dissociative attachment losses by the heating. In the nighttime, the ionosphere was lifted by 30 to 50 km through continuously upward expansion, resulting in the drop of the electron density in the bottomside of the ionosphere in time. A comparison with the ionogram, height, and electron density distribution of unheated ionosphere with similar background conditions further elaborates the observation of thermal expansion.

Original languageEnglish (US)
Article numberA03304
JournalJournal of Geophysical Research: Space Physics
Volume116
Issue number3
DOIs
StatePublished - 2011

Fingerprint

transmitters
electron density
ionospherics
ionospheres
ionosphere
heating
density distribution
electron
ionospheric electron density
electron-ion recombination
ionograms
noon
zenith
heaters
attachment
thermal expansion
photoionization
temporal evolution
temperature distribution
recombination

ASJC Scopus subject areas

  • Space and Planetary Science
  • Geophysics

Cite this

Ionospheric modification from under-dense heating by high-power HF transmitter. / Kuo, Spencer; Snyder, Arnold; Mishin, Evgeny; Kossey, Paul; Battis, James.

In: Journal of Geophysical Research: Space Physics, Vol. 116, No. 3, A03304, 2011.

Research output: Contribution to journalArticle

Kuo, Spencer ; Snyder, Arnold ; Mishin, Evgeny ; Kossey, Paul ; Battis, James. / Ionospheric modification from under-dense heating by high-power HF transmitter. In: Journal of Geophysical Research: Space Physics. 2011 ; Vol. 116, No. 3.
@article{a1a0ac6802f3469b87f9fcb9c49fb647,
title = "Ionospheric modification from under-dense heating by high-power HF transmitter",
abstract = "Under-dense HF heating experiments were conducted near local solar noon as well as in the nighttime with the HF heater transmitting at 9.1 MHz directed along the geomagnetic zenith and run at 2 min on and 2 min off. The effective isotropic radiated power of the HF transmitter exceeded 3 GW. The Digisonde operated in a fast mode was used to monitor the temporal evolution of the ionospheric electron density distributions in the bottomside of the ionosphere (in the ranges from 90 to 190 km in the noontime and from 230 to 350 km in the nighttime). The electron temperature distributions were then evaluated. The results show that the electron density distributions are modified continuously over the experimental periods. In the noontime, the electron density decreases/increases in time in the region below/above a height at about 140 km, manifesting the change of the balance between the photoionization and the electron-ion recombination and the electron-oxygen dissociative attachment losses by the heating. In the nighttime, the ionosphere was lifted by 30 to 50 km through continuously upward expansion, resulting in the drop of the electron density in the bottomside of the ionosphere in time. A comparison with the ionogram, height, and electron density distribution of unheated ionosphere with similar background conditions further elaborates the observation of thermal expansion.",
author = "Spencer Kuo and Arnold Snyder and Evgeny Mishin and Paul Kossey and James Battis",
year = "2011",
doi = "10.1029/2010JA016244",
language = "English (US)",
volume = "116",
journal = "Journal of Geophysical Research: Space Physics",
issn = "0148-0227",
number = "3",

}

TY - JOUR

T1 - Ionospheric modification from under-dense heating by high-power HF transmitter

AU - Kuo, Spencer

AU - Snyder, Arnold

AU - Mishin, Evgeny

AU - Kossey, Paul

AU - Battis, James

PY - 2011

Y1 - 2011

N2 - Under-dense HF heating experiments were conducted near local solar noon as well as in the nighttime with the HF heater transmitting at 9.1 MHz directed along the geomagnetic zenith and run at 2 min on and 2 min off. The effective isotropic radiated power of the HF transmitter exceeded 3 GW. The Digisonde operated in a fast mode was used to monitor the temporal evolution of the ionospheric electron density distributions in the bottomside of the ionosphere (in the ranges from 90 to 190 km in the noontime and from 230 to 350 km in the nighttime). The electron temperature distributions were then evaluated. The results show that the electron density distributions are modified continuously over the experimental periods. In the noontime, the electron density decreases/increases in time in the region below/above a height at about 140 km, manifesting the change of the balance between the photoionization and the electron-ion recombination and the electron-oxygen dissociative attachment losses by the heating. In the nighttime, the ionosphere was lifted by 30 to 50 km through continuously upward expansion, resulting in the drop of the electron density in the bottomside of the ionosphere in time. A comparison with the ionogram, height, and electron density distribution of unheated ionosphere with similar background conditions further elaborates the observation of thermal expansion.

AB - Under-dense HF heating experiments were conducted near local solar noon as well as in the nighttime with the HF heater transmitting at 9.1 MHz directed along the geomagnetic zenith and run at 2 min on and 2 min off. The effective isotropic radiated power of the HF transmitter exceeded 3 GW. The Digisonde operated in a fast mode was used to monitor the temporal evolution of the ionospheric electron density distributions in the bottomside of the ionosphere (in the ranges from 90 to 190 km in the noontime and from 230 to 350 km in the nighttime). The electron temperature distributions were then evaluated. The results show that the electron density distributions are modified continuously over the experimental periods. In the noontime, the electron density decreases/increases in time in the region below/above a height at about 140 km, manifesting the change of the balance between the photoionization and the electron-ion recombination and the electron-oxygen dissociative attachment losses by the heating. In the nighttime, the ionosphere was lifted by 30 to 50 km through continuously upward expansion, resulting in the drop of the electron density in the bottomside of the ionosphere in time. A comparison with the ionogram, height, and electron density distribution of unheated ionosphere with similar background conditions further elaborates the observation of thermal expansion.

UR - http://www.scopus.com/inward/record.url?scp=79952462007&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=79952462007&partnerID=8YFLogxK

U2 - 10.1029/2010JA016244

DO - 10.1029/2010JA016244

M3 - Article

VL - 116

JO - Journal of Geophysical Research: Space Physics

JF - Journal of Geophysical Research: Space Physics

SN - 0148-0227

IS - 3

M1 - A03304

ER -