Combined EISCAT radar and optical multispectral and tomographic observations of black aurora

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Space and Planetary Physics

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https://doi.org/10.1029/2007JA012999
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eiscat DCS-publications-id, art-920, DCS-publications-credits, dasi, iono, DCS-publications-personnel-id, 193, 7, 51, 9

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Combined EISCAT radar and optical multispectral and tomographic observations of black aurora. / Gustavsson, B.; Kosch, Mike J.; Senior, Andrew et al.
In: Journal of Geophysical Research, Vol. 113, No. A06308, 25.06.2008.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Bibtex

@article{cfac52504e824ea4bbc817030270e9d9,

title = "Combined EISCAT radar and optical multispectral and tomographic observations of black aurora",

abstract = "Black auroras are recognized as spatially well-defined regions within a uniform diffuse auroral background where the optical emission is significantly reduced. Black auroras typically appear post-magnetic midnight and during the substorm recovery phase, but not exclusively so. We report on the first combined multimonochromatic optical imaging, bistatic white-light TV recordings and incoherent scatter radar observations of black aurora by EISCAT of the phenomenon. From the relatively larger reduction in luminosity at 4278 {\AA} than at 8446 {\AA} we show that nonsheared black auroras are most probably not caused by downward directed electrical fields at low altitude. From the observations, we determine this by relating the height and intensity of the black aurora to precipitating particle energy within the surrounding background diffuse aurora. The observations are more consistent with an energy selective loss cone. Hence the mechanism causing black aurora is most probably active in the magnetosphere rather than close to Earth.",

keywords = "eiscat DCS-publications-id, art-920, DCS-publications-credits, dasi, iono, DCS-publications-personnel-id, 193, 7, 51, 9",

author = "B. Gustavsson and Kosch, {Mike J.} and Andrew Senior and Kavanagh, {Andrew J.} and Br{\"a}ndstr{\"o}m, {B. U. E.} and Blixt, {E. M.}",

note = "Copyright (2008) American Geophysical Union. Further reproduction or electronic distribution is not permitted",

year = "2008",

month = jun,

day = "25",

doi = "10.1029/2007JA012999",

language = "English",

volume = "113",

journal = "Journal of Geophysical Research",

issn = "0148-0227",

publisher = "American Geophysical Union",

number = "A06308",

}

RIS

TY - JOUR

T1 - Combined EISCAT radar and optical multispectral and tomographic observations of black aurora

AU - Gustavsson, B.

AU - Kosch, Mike J.

AU - Senior, Andrew

AU - Kavanagh, Andrew J.

AU - Brändström, B. U. E.

AU - Blixt, E. M.

N1 - Copyright (2008) American Geophysical Union. Further reproduction or electronic distribution is not permitted

PY - 2008/6/25

Y1 - 2008/6/25

N2 - Black auroras are recognized as spatially well-defined regions within a uniform diffuse auroral background where the optical emission is significantly reduced. Black auroras typically appear post-magnetic midnight and during the substorm recovery phase, but not exclusively so. We report on the first combined multimonochromatic optical imaging, bistatic white-light TV recordings and incoherent scatter radar observations of black aurora by EISCAT of the phenomenon. From the relatively larger reduction in luminosity at 4278 Å than at 8446 Å we show that nonsheared black auroras are most probably not caused by downward directed electrical fields at low altitude. From the observations, we determine this by relating the height and intensity of the black aurora to precipitating particle energy within the surrounding background diffuse aurora. The observations are more consistent with an energy selective loss cone. Hence the mechanism causing black aurora is most probably active in the magnetosphere rather than close to Earth.

AB - Black auroras are recognized as spatially well-defined regions within a uniform diffuse auroral background where the optical emission is significantly reduced. Black auroras typically appear post-magnetic midnight and during the substorm recovery phase, but not exclusively so. We report on the first combined multimonochromatic optical imaging, bistatic white-light TV recordings and incoherent scatter radar observations of black aurora by EISCAT of the phenomenon. From the relatively larger reduction in luminosity at 4278 Å than at 8446 Å we show that nonsheared black auroras are most probably not caused by downward directed electrical fields at low altitude. From the observations, we determine this by relating the height and intensity of the black aurora to precipitating particle energy within the surrounding background diffuse aurora. The observations are more consistent with an energy selective loss cone. Hence the mechanism causing black aurora is most probably active in the magnetosphere rather than close to Earth.

KW - eiscat DCS-publications-id

KW - art-920

KW - DCS-publications-credits

KW - dasi

KW - iono

KW - DCS-publications-personnel-id

KW - 193

KW - 7

KW - 51

KW - 9

U2 - 10.1029/2007JA012999

DO - 10.1029/2007JA012999

M3 - Journal article

VL - 113

JO - Journal of Geophysical Research

JF - Journal of Geophysical Research

SN - 0148-0227

IS - A06308

ER -

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